Tube tester machine. TV-2 Tube Tester. Tensile test machines, also known as tensile testers, are universal testing machines specially configured to evaluate the tensile strength of specimens. High quality IEC 60529 IP Testing Equipment Oscillating Tube Tester IPX3 / IPX4 from China, China's leading rain test equipment product, with strict quality control rain test chamber factories, producing high quality rain test chamber products. We'll show you how to use this portable tube tester. The Shorts Test is the most important test that you can make . We took possession of our first Amplitrex AT1000 on 06/16/08 and our second Amplitrex in 2012. The Hickok Cardmatic was a tube tester with a difference. The Soot Buster, used for cleaning firetube boiler tubes, is a pneumatically actuated cleaning tool that propels itself inside of tubes and scrubs the tube ID with each pulse. de. 38 shipping. Time Owned: more than 12 months. Drawing inspiration from a 2015 video Phils' tester is the center piece of our Quality Assurance process. May 28, 2007 · I would like to get a tube tester of my own so I can make sure how good my tubes are matched and how good they are. Characteristics: Stabilized operating voltages, ceramic sockets for all tubes. Now they have become standby units. Standard test -- $2. The Vacuum Tube Leak Tester PVLD-3000 is a simple and precise tool used for testing tubes of boilers, condensers and heat exchangers. The aforesaid systems are used for different purposes, such as production tests, high-pressure lines, Step 1: Tube Circuitry. Model 156 is a portable type tube tester. Space Tech Labs Canada ATT-1. Obtain fast and accurate results with our melting point apparatus. com. Introducing the finest vacuum tube test station available - the MaxiMatcher 2. Hydraulic Testing Machine. Once defective tubes were identified, the customer could purchase new ones. This unit is from the early 1960's and will test octal, loctal, 7 pin, 9 pin, compactron and many other tubes. We use it more for certain power tubes that we cannot accurately test with any other tube tester; such as triodes like 845 and 300B tubes. Designed to be ergonomic and easy-to-use, yet jam-packed with advanced features, the L Series breathalyzers are state-of-the-art tools that will protect roads, communities, and workplaces around the world. This tester will test any type of guitar or audio tube. Testing and Matching. Sep 12, 2023 · Tap the tubes with a pen or pencil and listen to their ringing – Plug the tube into the amp or any other machine. Hours: 8:00 am to 4:30 pm CST. It came with 39 test cards. Jackson 658-1 Tube Tester for Parts/Repair Canuck Audio Mart CA$150 25% Jan 30, 2024. 2425 Skymark Ave, Unit 1. Description. February 8, 2024 by Jenny List 13 Comments. Tube testers excel in this role. +1 877-372-4371. RT90 Tube Fillers – to 90 Per Minute. Aluminium Tube Filling Machine. Below is the electrical diagram for a typical tube. Tube filling machines include a tube bulk bin, load ramp, orient, fill station and closure stations for plastic, laminate or aluminum tubes. The test setup chart that is with the unit has just 3 tubes listed for testing, 25L6, 6SK7, & 12SN7. We had to keep several tube testers around to test different tubes. Get in touch with Dräger. This an impressive looking tester with no less than 5 meters on the front panel. For example, transconductance testing is certainly much easier using the dynamic test of a B&K or Hickok. Call: 1-847-577-3980. Jim Hildenberger Analog Brothers. Each tensile test machine is configured to your testing needs by our application engineers with the correct controller Welcome to Falex, the leading supplier of high quality petroleum and tribology test equipment for the evaluation of the physical properties of fuels, lubricants and materials. Their line of ‘Mighty-Mite’ emission tube testers were quite popular, and many examples can be found today. The E-Z Tube Tester was manufactured by the E-Z Tester Co. The high quality touchscreen of the Sartocheck ® 5 Plus Filter Tester provides a unique viewing angle, an intuitive user interface, a logical menu structure, and simple data entry options. Mobile Apps Sylvania_Model_140_Tube_Tester Identifier-ark ark:/13960/s2fgvz32fzh Ocr A Practical Guide to Tube Testers and Tube Testing - includes explanation and use of a TV-7D/U and an Eico 667 as well as practical tips and usages. Hickok 539C Vacuum Tube Tester US Audio Mart $1,600 24% Mar 22, 2024. Here are some important safety tips: Remember that a tube amp possesses a great amount of voltage. This unit will test octal, loctal, 7 Step 1: Notes and Pictures. Tube Section: Straight. 3V I used a seperate power supply. Firm headstock for front-end and trolley type movable tailstock unit. Jun 9, 2021 · After undoing ham-fisted repairs, replacing the dud components, and installing some new old stock tubes, the tester sprung to life with renewed vigor. Medium Speed automated filling and closing of squeeze tubes. Bring a chopstick or pencil or another wooden implement. Rectifier - use this position to test rectifier diodes, press switch marked rectifier and cold K test - check meter reading. Taking an insulated jumper from a grounded point to a plate lead on a pre amp tube should eliminate the excess charge. . When new, it retailed for about $40, which in 2021 would Instron manufactures tensile, compression, fatigue, impact, rheology, and structural testing machines, testing a variety of materials and range of applications. Just about every vintage repair book correctly suggests to “test the tubes” as a technician’s first diagnostic step. In tube testers that use a lamp to detect shorts and leakage, the brighter the lamp glows, the “more shorted” the tube is, as opposed to “leakage”. July 3, 2022. Specification Model - RS-8017 Capacity - 50N, 100N, 200N, 500N Unit (switchable) - N, Kgf, Lbf Store (exclude the grips) - 150mm Effective width - 130mm Test speed - 10-150mm/min Main unit dimension (WxDxH) - 490x220x260mm Main unit weight Tube Testing for Unsealed Plastic tubes. Air flow test tubes can be used universally. Learn about Hickok's tube testers and meters, the best tools for testing and repairing vacuum tubes and electronic devices. Tube Testing, Matching, and Ordering Info. What makes it a little confusing is that there were many ‘Mighty-Mite’ tube tester models! Featuring old photos, scanned documents, articles, and personal anecdotes that offer a glimpse into the past. Since our humble beginnings in 1927, we have helped companies in industrial applications, including aerospace, military, and manufacturing, meet the highest ASTM and industry standards as they develop their materials Feb 8, 2024 · A Tube Tester Laid Bare. The venerable TV-7D/U! Made for the military using the Hickok transconductance circuit. This hydraulic tester is used to perform leaking and hydraulic pressure test on ERW tubes or spiral welded pipes. Designed for direct integration into the production line and based on simple concepts, yet provides industry-leading performance at a low total cost per inspected part. May 14, 2024 · Hickok 600A Tube Tester Canuck Audio Mart CA$650 Aug 28, 2023. We like to answer questions about the RM 1 at any time. It's easy. 75 x 13. Watch L Series Video. pressure test machine HIGH FLOW HYDRAULIC PORTABLE UNIT HPTU-250. During the 1960’s, Sencore made quality test equipment for the TV service technician. Just send an e‑mail to beck. It is the fastest and most accurate method of locating leaky tubes for plugging or replacement or installation of new tubes. FitCheck Mode shows in real-time how respirator fit changes throughout donning and adjustment, helping users select the right mask and identify the best fit more quickly. The updated tube list is at the BAMA mirror site. It takes a little longer to set up than most testers, but should give more accurate results than most testers. The tester, made by American Scientific Development Company, probably in the early 50s, was used in drug stores and other merchants to allow customers to test the tubes in their TV sets. It provides step-by-step instructions for testing a tube, including setting the knobs and sliders, inserting the tube, and conducting a merit test. However, we have in depth instru Davis Tube Tester. Stark 12-22A Mutual Conductance Tube Tester Canuck Audio Sep 10, 2005 · Subscriber. Apr 14, 2023 · This is how to test vacuum tubes using a Sylvnia 222 tester. 4,6 kg. Determine melting point, boiling point, cloud point, and slip melting point on one device. He also didn’t have a tube tester handy. 280″ to 2. It is widely used in cosmetics, pharmaceuticals, chemicals and foodstuffs industries. 356 kg. Just tell me which version you need. Preamp tube testing and batch power tube testing. Tube Size: 0. Dec 22, 2021 · From what I can tell, this is a very similar model, except that it used a different rectifier, and it included some extra circuitry for also testing condensers (capacitors) and also had a phones jack for testing tubes for noise. The Amplitrex T-1000A is an incredible one-box tube testing system. Standard Test $4 per tube. While I cannot offer training on how to use any testers, if you have questions or concerns about which tester may be right for you, please e-mail me, or phone during business hours weekdays at 847-496-4546. Dimensions (WHD) 8 x 5. Data Sheet (Rowa 40/60PAT || Data Sheet (Rowa 90/120/160) || Function Principle. 01 ($800, built to order) 5. Show more. Provides a Fast and Effective Method for Pneumatically Testing Heat Exchanger Tubes and Tube-to-Tubesheet Joints for Leaks, G-250 Vacuum Tube Testing Guns are designed to quickly seal off and evacuate individual heat exchanger tubes to test the tube for leakage. The settings for the 7591 are. The test setup consists of connecting the tube pins to the tester by the use of short jumpers, and then setting up each elements' parameters. The PortaCount™ Respirator Fit Tester Model 8048 provides a consistent and objective testing experience across all respirator types, including all N95 filtering facepieces. 5 inch / 203 x 146 x 343 mm. Accurately pinpoint the leaking tube that's causing costly downtime the first time you leak test, every time you leak test. Each store selling tubes usually had a tube testing machine with several dozen tube sockets and various charts to find the right data for your tube. Air flows are quick and easy to see. To cover all the Ampeg V4 series amplifiers, we had a custom test jig and preset made for the 6K11 tube, allowing us to test all 3 sides. CTS also offers custom leak test connectors for seal surfaces in irregular shapes and sizes. One of the few tube testers that can really put the screws to a tube,haha. MaxiPreamp 2 ($1200) (can only test preamp or rectifier tubes, unit includes four socket adapters for octal tubes @ $55 each) 4. One of the most relied upon vintage testers. Why this matters: most tube testers outside of a laboratory test at a limited or starved voltage, so the tube that tests good at “X” voltage (for example, 100 volts) might perform completely different at Jan 31, 2013 · The most dangerous of these home tube testers I have seen is the E-Z Tube Tester. The Waygate Technologies Krautkramer Rowa series bar/tube/pipe ultrasonic test machines, Baker Hughes business products (formerly GE Inspection Technologies), use of phased array This is an unusual tube tester, circa 1948 from IBM, yep the computer people. Jun 6, 2012 · Odds are that it is a dedicated line voltage meter, so that the line voltage can be reset during testing of high current tubes. This is determined in part by the circuit in which the tube is to be used, in case of an RF or IF amplifier tubes, the stage gain is proportional to the transconductance; for this the Gm test is the most important. The computerized tube tester has speeded up our tube testing and it tests an amazing range of tubes. Language. NEW CARBURETOR VALVE FUEL PUMP PRESSURE & VACUUM TESTER GAUGE G1015 $19. Until the late 1970s many drug stores and electronics shops sold electron tubes. $50. In use I manged to damage the milliammeter due to faulty valve, I plan to put a diode . High Speed automated filling and closing of squeeze tubes. Our extensive suite of testing equipment enables you to perform all testing necessary to accurately produce and verify material data sheets, including melt flow and HDT / Vicat Eico Model 667 Tube Tester with Documentation, Tested and Working. This machine is designed to test the infilled/unsealed plastic tubes. Weight: approx. This particular unit has been calibrated by the Aug 11, 2020 · The plate currents are also higher than most machines, which really helps with types that have to work harder for a living, things like rectifiers, driver tubes and power tubes. Fives offers Taylor-Wilson hydrostatic pipe testers to accommodate any length variation, as well as tube and pipe testing with diameters from less than 25 mm to over 660 mm (1 to 26 inches): Tests are performed with stable pressure of 35 bars (500 psi) to over 1,750 bars (25,000 psi), and can be easily varied to specific standards. Learn more. It can kill someone! The filter capacitors in the amp will have some charge left in them after the amp is shut off. Connect standard plant air supply to the active vacuum gun and insert the conical seal into the end of the tube to This is an Eico 667 tube tester in vintage condition. Amplitrex AT1000 (~$3000) (can test tubes up to 500V) 2. Bend tests tend to be associated with ductile metals and metal products. The cabinet contained a stock of To test vacuum tubes, use a multimeter with a diode checker function and follow these steps: set the multimeter to the diode mode, connect the red probe to the tube’s plate, and the black probe to the cathode to check for conductivity. Multi-Coupling System® plans and manufactures systems to multiply the pressure of liquids, such as water, oil, glycol emulsified water. Of course, this tester uses the transconductance method for measuring tube quality. Sweep tubes can, indeed, be checked by the TV-7 with any of several 9/12 pin, after-market Drug Store Tube Tester. Feb 5, 2024 · TV-7 Electron Tube Tester (schematic only) Collection. Notes. I tested the same tubes on a Hickok 6000A and they tested in the 80-90 range. 00. Headstocks, to and from movement controlled Discover the innovative self-service tube tester from the 1950s-1960s, which allowed TV owners to easily replace tubes at corner grocery stores. Get the best deals on Tv Tube Tester when you shop the largest online selection at eBay. I believe this would have this tester then be in keeping with the features and test procedures of the 539 series of testers. This guide explains how to use the EICO Model 667 Dynamic Conductance Tube and Transistor Tester to test vacuum tubes. An Tablemodel, with any shape - general. No minimum order. Shipping calculated at checkout. Testing is going well and based on the feedback we received, we made a number of modifications to the features. #9. Explore the history of vintage radios and childhood memories. These machines consists of a single or dual column frame equipped with a load cell, testing software, and application-specific grips and accessories such as extensometers. TubeTerra brings you affordable, laboratory grade vacuum tube testing. Then, reverse the probe connections, and if the results are the same as before, the tube is most likely Mar 16, 2015 · Unlike the old “emission” testers of the past, this low cost tester provides a true test of a valve at valve databook conditions. Parts are available and calibration, even the original TV-7, is doable in the average hamshack. 5 bids. Take on the mission of quickly and easily finding tube leaks. The EL81 is also overrun with some valves, this has not caused a problem. Jul 3, 2022 · Al Williams. Utilize the RECON Series and test every tube quickly and efficiently with the most ergonomic test gun on the market. from small triodes: 12at7, 12au7, 12ax7,6sl7,6sn7 to power triodes / pentodes like: 2a3, 300b, el84, 6v6, 6l6, el84, el34, kt66, kt88, etc Transconductance ( Gm ), Internal resistance ( Rp ) and Gain ( µ ) can easily be calculated using 2 simple measurements. The project has unfortunately been delayed however, as all our efforts are currently being focussed on The Great British Mar 7, 2023 · amp, eico, eico 667, hifi, radio, tester, tv, vacuum tubes, valves, vintage tech. We can even use it to grade small signal tubes Get the best deals on Radio Tube Tester In Vacuum Tube Testers when you shop the largest online selection at eBay. The Eico has a tendency to report tubes on the low end, so it For a more in-depth discussion on how Upscale Audio grades small signal tubes, click here. We simply call these machines the last word in tube testing at this time. It will also diagnose leaking valves, incorrect timing, leaky intake manifolds and clogged mufflers. Will be very well packed. 3, SEL 3, UP 3 (4-8)6, DN 2 5. 1 Head Open Tube Burst Tester-Data Sheet Aug 27, 2015 · A Look at Sencore Tube Testers. The previously inoperable internal neon lamps Feb 24, 2024 · Orange Valve Tester MKII offers enhanced algorithms and an expanded database of valves, plus optional expansion modules. Essential Features of Hydro Testing Machine. Those outside the USA know them as valves. A tensile tester, also known as a pull tester or univeral testing machine (UTM), is an electromechanical test system that applies a tensile (pull) force to a material to determine the tensile strength and deformation behavior until break. RFQ Form. Explore L Series. $19. Sciemetric partner company, Cincinnati Test Systems (CTS) offers a full line of pneumatic connectors and seals for your leak testing equipment, including pneumatic tube fittings, Luer connectors, and more. Jun 15, 2021 · But in the 1950s, you might have had a punched card machine on your electronics workbench. Offers 3 to 4 tension beam structure to withstand static load while the hydro-testing process. I used black oxide finish #4-40 machine screws, flat washers, and lock washers from BoltDepot. There’s still a mystique around vacuum tubes long after they were rendered obsolete by solid state devices, and many continue Some of you may have seen the prototype of our first model, the Brimar MultiValve, at the NVCF show in 2016. Is this a tester that would do the job? I really do not know much more than what I did with a tube tester when my dad would test and or buy a new tube for our TV when we were Firetube Boiler Tube Cleaning System. Price in first year of sale. It was a common rumor (maybe spread by TV repair shops May 1, 2014 · TV-7 Tube Tester Department of the Army Technical Manual TM11-5083Department of the Air Force Technical Order T016-35TV7-6 Search the Wayback Machine. Ideal equipment for anyone Manufacturing, Importing, ordering or Using plastic tubes where the quality and integrity of the tubes need testing or to be proved prior to shipping or use. Knight kg 600b tube tester Canuck Audio Mart CA$130 35% May 6, 2024. 4mm) ID. Tube Size: 1-1/4″ to 4″ (31. Use it for gently tapping each tube. hickok 539c tube tester. It uses low cost, readily available parts and can be built for well under A$100. It is the most well thought out and precise tester we have ever used to date. The TV-2 was designed by Hickok for the US military. Bend test equipment and test procedures are similar to flexure test equipment. 8 – 101. This 1952-era tube tester was made from a standard 3 x 5 file card box and a piece of wood with a nightlight lamp mounted in it. Used Superior Instruments Co TV-11 Tube Tester Excellent Fully Functional The Superior TV-11 is a basic that includes a noise test jack and a condenser testing feature. Type: Vacuum Test Gun. Request a Quote. The TV-7 ( ) series tube checkers are, by any standard, arguably the most usable and reliable of the tester of the lot. The MU150 was designed to quickly determine if your power tube WILL WORK, HOW STRONG IT IS, and finally to MATCH it up gain wise with others. About This Listing. Open Contact Form. I grew up poor in the sixties, the only TV sets we ever had were salvaged from the garbage, my Dad would drag them home, pop out all the tubes and send me to Feb 21, 2023 · 1. 456″ (7. TV-7 Electron Tube Tester (schematic only) Addeddate. Mississauga, ON L4W 4Y6. 0. United Pharmatek's Automatic Tube Filling machines are designed and engineered to produce outstanding quality and precision tube filling and sealing of aluminum tubes or metal tubes with the output of up to 90 tubes per minute. All tubes are screened for shorts, gas, and heater-to-cathode leakage (unless it’s a directly heated tube), and then tested for emissions and transconductance (Gm) on an Amplitrex AT1000 (in some cases on a Triplett 3444). 2 lb = 1 kg) 14 lb (14 lb 0 oz) / 6. elektroakustik@t‑online. SHUNT 15, FIL 6. Back in the 50’s, 60’s and 70’s it was common for do-it-yourselfers to try fixing their own TV sets by testing tubes where ever there was a self service tube tester. A compact phased array ultrasonic testing machine for wall-thickness and dimensional measurement on seamless and electrical resistance welded tubes and pipes. Categorys: AUXILIARY EQUIPMENT FOR TUBE MILLS. Model 156-A is a counter type tube tester. Likewise, grid leakage sensitivity is best tested in a Mighty Mite or similar machine. They were VERY popular among old-timer technicians. modded, following will eccher instructions for work with tubes or with solid state tube replacement. Laboratory testers like the big Hickoks, Triplett, Weston and AVO -- and the newer AT1000 actually either cannot find GAS as well as this machine. 99 EA Description: This tester will test fuel pump pressure and all vacuum operated devices. tensile pull force. We use the Amplitrex AT-1000, the most accurate tube tester in the world. It can work from 120V (US version) or 240V (European version). A typical tensile testing machine consists of a load cell, crosshead, extensometer, specimen grips Intelligently design and battle tested for impossible missions. [M Caldeira] needed to test a tube and didn’t have a spare to do the old swap test. 0 is presented with a clean new look. , in Macon, GA. Tensile tests are performed on universal testing machines, also known as tensile machines or tensile testing machines. Free shipping on many items | Browse your favorite brands | affordable prices. Strongly designed steel fabricated body for the larger diameter of tube and pipe machine. 6mm) OD. Sencore Mighty Mite solid-state tube testers (TC28 Hybrider, TC162, and TC154) are durable, easy-to-use, and test a wide variety of modern tubes (including modern sweep tubes such as #8950). The Orange Valve Tester MKII has been unveiled this week by Orange Amplification. these testers were the pinnacle of design for field techs back in the day. You can order bags of 100 pieces each of screws, washers, and lock washers for $23, including tax Heat exchanger leak detectors are the easiest way to check your heat exchanger, condenser or other tubular pressure vessels for leaks in just seconds. $37. Mains voltage: 230 V / 50 Hz (optional: 115 V / 60 Hz) Cabinet size (W x H x D): 315 mm x 93 mm x 215 mm. The primary purpose of a tube tester was “to find bad tubes” [6] — tubes that could be causing a problem in the equipment that the technician was repairing. TAD Bias Master QUAD Digital Display Bias and Matching Tester for Matching Power Tubes. Identifier. I have not tested this machine and do not know if it is working. This allows straightforward programming of tests and QRM enhancement features, as well as error-free operation in GMP production environments. May 12, 2011. The support has been great. My intention was not to replace any vintage tube tester, but instead, to supplement functionality that does not exist in traditional tube testers. Net weight (2. 1 to 62. I'm used it only a few times. For most people, they are a very good choice. An illustration of a magnifying glass. In addition, it tests for shorts and “gassy” valves with the ability to measure the Gm or transconductance of a valve. English. These were built tough to survive the rigors of the battlefield and accurate for critical applications. The kit comes complete with (3) brass fittings. Operation is easy. The TV-10 is an emissions-type tester from about 1949. It will test nearly all consumer tubes from the mid 1920's - early 1960's (big pin, octal, loctal, 7 & 9 pin miniature and sub-miniatures. Telephone: +1 800 877 6674 Back performance testing machine SM-8017. The Davis tube or Davis tube tester is a laboratory machine designed to separate a small sample of pulverized magnetic iron ore into magnetic and non-magnetic fractions. this 539c is in outstanding "excellent to mint" condition and an absolutely beautiful time machine. manual semi-automatic for tubes. Improving on the well known classic tester, the Matcher 2. Meet our newest and most advanced breath alcohol testers — the L Series. Send an Email. Bend test machines are typically universal testing machines specifically configured to evaluate material ductility, bend strength, fracture strength, and resistance to fracture. This will put new tubes in the 60 - 65 range. Rare 1929 WESTON 547 Radio Set Tester- Pre-Tube Tester Days NR RADIOORPHANAGE. opensource. 00 per tube Our standard tube testing service includes the following: current draw (mA)† transconductance (Gm)† gas current (mA) noise/microphonics screen Vacuum tube testing & matching. Request a quote for a Davis Tube Tester. TV and radio tube tester - 1950's and 60's virtually every drug store had one. An oddity of this kit is that you need to supply the hardware to mount the tube sockets. Deposit Type: Soft (Soot) Thickness: Light & Medium As a global leader in mechanical testing, Instron ® partners with many of the world’s largest plastics manufacturers to implement and optimize their testing programs. MaxiMatcher 2 ($1000) (can only test power tubes at 325 or 400 volts) 3. Attach the tube sockets to the aluminum chassis (Figure 4). Shorted tubes will NOT perform correctly in-circuit. This simple-to-use device is poised to revolutionize how Hi-Fi valves (tubes) are tested, offering unparalleled precision and ease of use. fully reversible. learn more The point in question now is whether the emission or transconductance test is the best. Ending Feb 4 at 7:11PM PST1d 23h. Mar 23, 2023 · I take a look at this very simple tube tester intended for home use. This is a great tester for testing tubes for your vintage radios and audio equipment at a fraction of the cost of a Hickok tester. RT60 Tube Fillers – to 70 Per Minute. Our tensile testers will measure characteristics such as ultimate tensile strength, yield strength, elongation, and modulus. Jul 19, 2007 · Check this again with the tube installed and filament warm, adjust as necessary - with power tubes and rectifiers you might need to tweak this again before reading the final value. I used valve data for an AVO valve tester when testing valves, any valves that required a heater voltage other than 6. **. 2024-02-05 22:33:27. All the tubes ring, but the bad ones sound louder and might even cause the device to squeal. As always, the Matcher is there to help you make the best possible choices for your audio system by producing the best information possible about your tubes. The tube tester comes with several guides and pieces of ephemera, including an original tube data manual that gives specific information about different kinds of vacuum tubes. Feb 5, 2024 · Search the Wayback Machine. Nothing will equal a dedicated high voltage/high current test rig for these types, but the 658 is a good second. MaxiMatcher MaxiPreamp II Digital Tube Testermade in USA+ 4 socket saversThe tester is absolutely like new. Shorted tubes are often the cause of circuit defects. These self service tube testers were commonly found in drug stores, hardware stores, service stations, and even some large grocery stores. We manufacture our vacuum leak detector to fit tubes from 1/4" to 3" O Digital Vacuum Tube Tester, Duovac 1. ae ix va ro ec jx ro gl im kc