The EZ81 was the big brother to the EZ80 full wave rectifier, giving 150 mA against the 90 mA for the EZ80. Tube Type: EZ81/6CA4. I am looking to use an EZ81 rectifier tube in a preamp buffer project driving a 12AU7 or 6N1P- EV (yet to decide) JMO, if the vacuum rectifier is already on hand, using it in a preamp project makes sense. Mullard EZ81 / 6CA4 - Bugle Boy label. PURPOSE: The purpose of this supplement is to ammend the basic publication. Single JJ EZ81 Rectifier Tube. other diode to pin 6 and the cathode also to pin 8. First Source (s) 27. This tube will work in any EZ81 or 6CA4 application. From €28. GZ34S is 5AR4 octal base rectifier diode. This tube has the same shape and socket of the other amplifier tubes. 01 3 3 1969. $14. Various brands available. Our goal is to match within 5% with an upper limit of 15% (15% is the industry limit to consider a set). Radio tubes are valves. $12. Europe side contact P8A (Au P, 8SC) (Codex=Seo) Filament. Watch this gear and we'll notify you if it becomes available again. In addition, power tubes are tested/matched by plate current (Ip) and preamp tubes are tested/matched by gain. EZ81 Author: Tesla Subject: JHl-VC-FP-2012-05-12 Created Date: 5/11/2012 11:28:19 PM EZ81 Author: Philips Subject: FP-2005-05-06 Created Date: 5/7/2005 11:22:03 AM The thin glass tube envelope is 19 mm in diameter and, excluding the B9A base pins, is 70 mm tall. Click Here to Learn More. Skip to main content. Availability: 27 in stock. Javascript is disabled on your browser. Ships in 1 business day or less. Order Electro-Harmonix 6CA4 / EZ81 rectifier vacuum tubes online, in stock and ready to ship! Find reviews, data sheets and specs to upgrade your tube amplifier. Or fastest delivery Monday, January 29. Provides dynamic and robust performance. Additional Information and Downloads. JJ Electronic EZ81 / 6CA4 Rectifier tube. Free Shipping. First registered in May 1935 with control grid out from the octal base, almost a forerunner of 6SF5. These tubes are rated for a maximum reservoir capacitance of 50uF. This is a suitable replacement for any 6CA4 / EZ81 tube type. New Price$17. As 230 ohms aren't easy to get, 220 ohms is probably close enough. Identical to. Add to basket. All structured data from the file namespace is available under the Creative Commons CC0 License; all unstructured text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. Rectifier tubes will be tested for emissions on a calibrated military grade tube tester. You even can look up radio models with a certain tube line up. Description: DOUBLE ANODE RECTIFYING TUBE. Title: EZ81 Author: Brimar Subject: DPo-FP-2006-04-23 Created Date: 4/23/2006 11:40:00 AM EZ81 Double anoDe rectifying tube max 77,8 max 22,2 max 71,4 Base: NOVAL uf = 6,3 V if = 1 a Typical Characteristics: Capacitor Input f = 50 Hz utr eff = 2x250 2x350 2x450 V rt = 2x150 2x230 2x310 Ω i D. The thin glass tube envelope is 20 mm in diameter EZ81 Substitutes. Note: pins 2, 6, 8, and 9 are internal connections. It has the incomparable vintage British design, craftsmanship,construction, attention to detail, sound quality and performance. DOUBLE ANODE RECTIFYING TUBE. The USPS is Experiencing Serious Delays - Domestically and Worldwide. From €29. £ 23. There is a rectifier in the amp that is supposed to be an EZ80 (the label has faded We currently have NOS RFT EZ81 / 6CA4 rectifier tubes. Nature abhors a clean tube amp. It provides strong current output. SKU code: 6ca4jj. For a four pin rectifier, connect one diode anode to pin 2 and the. ECH81 page sheet date 1 1 1969. 3 Ampere / Indirect / Specified voltage AC/DC. High quality double anode tube and noval base. EZ81 Mazda-Belvu rr EZ81. Spend over $200 and get free shipping! We also do special orders. The EZ80 full wave rectifier was found in many broadcast receivers and domestic audio equipment. Tube EC 81 or Röhre EC81 ID18581, Triode, vacuum, Noval, 9 pin miniature (USA pico-9) B9A and UHF shown. Calculate Shipping: Feb 2, 2019 · The EZ81 filament has a very high insulation voltage. If you're used to using the Sovtek and Chinese variants you'll be pleasantly surprised. = 245 352 497 V Choke Input f = 50 Hz utr eff = 2x250 2x350 2x450 V i D. If an item is marked "Backorder" then they could take up to 3 weeks to arrive and may delay your order. Tesla 6CA4 / EZ81 Rectifier Vacuum Tube. 95. These were used as original equipment tubes by many vintage tube amp manufacturers, 4 days ago · FOR SALE 4 USED TESLA EZ81 TUBES. $ 27. If you are looking for a specific brand, let us know and we'll see if we can find it. EZ800000100KTS: 364Kb / 5P: Zilog Full-Featured TCP/IP Software Suite EZ80190: 432Kb / 36P: eZ80190 Module is a compact, high The JJ EZ81 is a modern production replacement for all classic EZ81/6CA4 rectifier applications. 3V filaments. USD $19. Socket: 9 Pin (Noval) Is often bought together Customers also bought Customers also viewed. Valves And Tubes Quick Reference Guide 1975/76, 36 pages. JJ EZ81 / 6CA4 Rectifier Vacuum Tube info: Jan 14, 2008 · An EZ81 is right in the middle and will give you the "correct" voltages for an 18 watt. View similar gear from other sellers on Reverb. 0 x. $11. Replaces 6CA4 or EZ81 vacuum tube types. Among rectifier tubes, their 6CA4 (EZ81) is an industry favorite, as it provides consistent performance along with great build quality at a reasonable price point. We have brands like GE, Sylvania and RCA. Hand written test data included. The Small Rectifier! The TAD EZ81 / 6CA4 is a small rectifier tube for 6. NXP Semiconductors is a publicly traded multinational company that designs, develops, and manufactures a wide range of semiconductors and integrated circuits for various applications, including automotive, industrial, communications, and consumer markets. 37 Kbytes. See also 1954 adverts. EZ81 / 6CA4 Rectifier NOS, TESLA. Current stock is branded Sonotone in original bulk pack (supplied in white boxes) Just $175. I will ship international. Availability: Usually ships within 24 hours. 8', 'brand': 'Soviet NOS', 'list': 'Also bought articles NOS Mullard EZ81 / U709 / 6CA4 NOS D Getter- These are the best sounding EZ81 made in the late 1950’s early 60’s with the D getter. 50. 80 *. It is used in smaller amps, such as the Marshall 1974X or the TAD 18W Plexi Kit, Silvertone amps and in various Hammond organ amplifiers. pdf (790979 bytes), 6CA4. In other words, there may be some ability to identify a "house sound" of each type of New Matched Pair of JJ EZ81 / 6CA4 Rectifier Vacuum Tubes. Connect the anode of the. JJ Electronic, Rectifiers 5U4GB 5Y3 EZ81 5AR4 GZ34. 25 Brand New White Vacuum Tube Boxes - Tall 9 Pin Mini - EL84 6973 EZ81 12AX7 . This tube is mainly used in small guitar amps like the Marshall 1974X or some Data Base Order Form, 1988, It has a nice overview of Mullard data books at that time, 2 pages. Share: Connector A. The tube tests with readings of 60/60 Minimum is 40 per section. If you are using the same 6. Yes, you got it more or less. It is a true full power EZ81. 1) Solid State Rectifier (NOT Weber Copper caps) 2) 5AR4/GZ34. 04. Product Data. They're all interchangeable within limits. final deter- EZ81/6CA4. High output current. 3 volt to feed the pre-amp valves and the EZ81, leave it floating. EZ81 Author: RFT Subject: GO-FP-2000-07-21 Created Date: 7/21/2000 9:16:36 PM Sep 6, 2014 · The tube rectified power supply uses an EZ81 tube. , sometimes required circuits in which valve cathodes carried large signals and had to 'float' at voltages well below that of the chassis. There is more variation within each brand/make/model of the same tube than there are between brand/make/model of different tubes. In original boxes, great rectifier for hi end audio amplifiers and preamplifiers, Philips quality! Noval socket, full wave rectifier tube, very suitable for small amplifiers and preamps, because of its small size and high power raitings. Aug. 03 4 FP 1999. OTOH, if a purchase is needed, high PIV Schottky diodes, which are every bit as quiet as vacuum rectifiers, are the way to go. Pre-Owned · RFT. JJ Electronics EZ81 rectifier tube also referred to as 6CA4. Specially designed for smaller amps, this compact rectifier tube delivers full power to invigorate your sound system. electron Tube Data sheets - E. Tube 6B7 or Röhre 6B7 ID2840, Double Diode-Pentode, 7-Pin-Base U7A = small, old, USA and RF/IF-Stage shown. $1 shipping when combined. JJ Electronic - Vacuum tubes, Capacitors, Amplifiers. The JJ Electronic EZ81 is a noval based rectifier with a rugged construction. The push-pull EL84 tube amplifier schematic is from the book "Build your own Audio Valve Amplifiers" by Rainer zur Linde. Tube EZ 11 or Röhre EZ11 ID611, Full-Wave Vacuum Rectifier, German Steel Y8A, 1938 and Power-supply shown. In use the maximum reservoir capacitor would be limited to 50 µF and to prevent damage by excess current an effective series resistance of 230 Ohms is used. Electro-Optical Products, 1972, 277 pages. 10. $3483. 3 Volts / If 0. Type EZ81 was first introduced in 1954. Price: $47. EZ81: 174Kb / 6P: DOUBLE ANODE RECTIFYING TUBE January 1970: Search Partnumber : Start with "EZ81"-Total : 49 ( 1/3 Page) List of Unclassifed Man EZ80: 68Kb / 2P: VEB FUNKWERK ERFURT Ausgabe Juni 1953: Zilog, Inc. 3 Ampere / Indirect / Specified voltage AND current AC/DC. other diode anode to pin 3. JJ EZ81 Rectifier. Note. Order JJ EZ81 / 6CA4 rectifier vacuum tubes online, in stock and ready to ship! Find reviews, data sheets and specs to upgrade your tube amplifier. It is used in smaller amps, such as the Marshall 1974X or the TAD 18W Plexi Kit, Silverstone amps and in various Hammond organ amplifiers. Therefore, no additional 5V secondaries are required in the transformers. JJ EZ81 / 6CA4 JJ Electronic. On June 18, 1935 the grid connection was moved to an added top cap and the base diagram was changed accordingly. View Full Listing. This Electro-Harmonix rectifier tube replaces 6CA4 or EZ81 vacuum tube types. 3V, like that of most triodes and pentodes used in guitar and HiFi amplifiers. Q: When does a preamp tube become a Premium Selected tube? Apr 11, 2015 · Get into the habit of looking up the tube data sheets. If your EZ81 is old and worn, treat yourself to a fresh one for $20. In Stock. Enter your search keyword EZ81 6CA4 Philips Rectifier Tube. Tube type: Full-Wave Vacuum Rectifier. FOR SALE 4 USED TESLA EZ81 TUBES. Title: EZ81 6CA4 Author: Mazda Belvu Subject: SM-FP-2003-04-12 Created Date: 1/24/2000 2:00:41 PM EZ81/6CA4 TAD PREMIUM SELECTED Rectifier Tube. Tube 81 or Röhre 81 ID2998, Half-Wave Vacuum Rectifier, UX-Base (4 Pins (2 thick, USA 1924, UX) and Power-supply shown. Jul 10, 2022 · The 6CA4 (European: EZ81) (P/N 154-0119-00) is a dual rectifier vacuum tube with a B9A (Noval) miniature 9-pin base. Every amp and each type of power tube has different limits so there 5Y3S. The Electro-Harmonix EZ81/6CA4 is an excellent replacement for those tough to find NOS tubes. c. 3 Volts / If 1. pdf (652247 bytes) EZ81 La Radiotechnique EZ81: MAZDA Valves & Picture Tubes Data, MK buizen handboek: Frank Philipse (Wildcat mirror - Jörg Jan Münter) 6CA4: 6BY6. 6CA4 EZ81 JJ Electronic Rectifier. The company was founded in 2006 and is headquartered in Eindhoven, Netherlands. 50 The 5Z4G is a full wave rectifier. ›. (GE); Bridgeport CT, Syracuse NY. Mar 24, 2005 · The reason I say EZ81's are scarce is because I have thousands of tubes from a lifetime of collecting, and hundreds of power rectifier tubes including (from memory) 5U4, 5AS4, 5Y3, 5Y4, 5AR4, 5V4, 80, 6X4, 6X5, 6W4, 6AU4, 6AX4, 6DW4, 6BL4, 816, 866, 872B, 3B28 and the list goes on, but no bloody EZ81's. Title: EZ81 Author: La Radiotechnique Subject: SM-FP-2003-08 Created Date: 8/25/2003 1:06:31 AM EZ81 (6CA4) NOS, Rectifier current stock RFT / RWN (East-Germany) / TESLA white boxed The TAD EZ81 / 6CA4 is a small rectifier tube for 6. The problem is: 7-PIN tube sockets and 6X4 are quite rare in Thailand, so I'm going to modify the PCB a bit by changing 6X4 to EZ81 which requires a 9-PIN socket. EZ81 Rectifier Tube Spec Sheet. including Reverb Bump. This was tested on my Dan Nelson calibrated TV-7/B. FREE delivery February 1 - 2. JJ is an undisputed leader in modern vacuum tube manufacturing, and for good reason. Find reviews, data sheets and specs to upgrade your tube amplifier. We require 100 mA at 310 V. Musical Instruments. New Listing 4 x RFT EZ81 Tubes . $30. Dec 15, 2015 · To construct the rectifier tube replacement, connect the anode of. It has a thick glass envelope and extremely robust electrodes. View similar gear. Close or identical CV3996, CV5072, EZ81, U709. Push-Pull (PP) EL84 Tube Amplifier Schematic Aug 9, 2010 · Measure the heater voltage with the EZ80 (and the other tubes) in the amp, then measure with the EZ81. References: Data-sheet, 3002 & 1040. Night Vision (XX1500), 1980, several leaflets and data, 46 pages. 18 W power output pentode with almost twice the sensitivity as the EL5, intended for applications designed for normal output pentodes as the EL3, but where twice the Order Tesla 6CA4 / EZ81 vacuum tubes online, in stock and ready to ship! Find reviews, data sheets and specs to upgrade your tube amplifier. 15 Electro Harmonix 6CA4. 00 shipping. Contact us at info@cedist. Guitar Tube Amp Kits. Vintage 1960s Mullard EZ81/6CA4 rectifier tube, D Getter, Great Britain, 1950s/60s. Its filament voltage is 6. Aug 31, 2009 · Amazon. You will find thousands of tubes or valves with interesting links. Measurements and Specs. What I'm not sure is: are there technical or electrical contraints for 6X4--> EZ81? Title: EZ81 Author: Brimar Subject: DPo-FP-2006-04-23 Created Date: 4/23/2006 11:40:00 AM JJ Electronic's double anode tube EZ81 is a 6CA4 Noval base rectifier diode used in a large number of vintage and reissue guitar amplifiers, as well as Hi-Fi amplifiers. Price is for a Single Tube. The JJ EZ81 / 6CA4 is a high quality rectifier that will work great as a replacement for tube amp needing an EZ81 / 6CA4. Electro-Harmonix 6ca4 Data Sheet. + $5. 1947 EL60 EL34. Quantity: Add to Cart. $34. 04 2 2 1956. 1956 : Electron Tube Registration List. Quantity. SKU: TE-EZ81. For the last one, you'll have to fight the radio collectors, as it's used in the military R-390 receiver. com: JJ EZ81 / 6CA4 Rectifier Vacuum Tube : Musical Instruments. The maximum reservoir capacitor was 50 µF and the minimum series resistance had to be 240 Ohms per anode. 1966 RCA 6CA4 EZ81 Rectifier Tube, Tested, NOS/NIB. Base. Vf 6. 1 Review. DOWNLOAD PDF. It was made in 1966. Tube EZ 80 or Röhre EZ80 ID790, Full-Wave Vacuum Rectifier, Noval, 9 pin miniature (USA pico-9) B9A and Power-supply shown. Feb 24, 2019 · Member. com Datasheet (data sheet) search for integrated circuits (ic), semiconductors and other electronic components such as resistors, capacitors, transistors and diodes. 01 5 5 1969. General Electric Co. 6CA4 Ratings. Pretty sure the amp will sound better. To install a 5AR4 or 5Y3, you'll need to resize the hole for the rectifier socket, install an octal socket and use a power transformer with a 2 amp, 5 volt filament tap. Worldwide shipping. EM81 page sheet date 1 1 1956. 90. Thyratrons for Industrial Control, 1954, 62 pages. com, or give us a call at 480-755-4712. 12 2 2 1969. Tube tests as new. 50 *. Suitable for all Hi-Fi and Guitar amplifiers. Jun 19, 2009 · A quick look at the tube data at NJ7P 's site shows 6853, 12DF5, 26Z5. Successor Tubes. 99. Testing and/or Matching. Filament. Jan 20, 2010 · The EZ80 does affect sound, but the differences are small. The same socket connections like EZ80 ( filament = 6. Description. 5Y3S is an octal rectifier diode with a true directly heated cathode. Title: EM81 Author: Philips Created Date: 7/10/1999 10:19:10 PM JJ EZ81 6CA4 Rectifier - Shop with AmpTubes and get 5% off your first order. These tubes are an excellent choice for guitar amps such as 18W Marshalls and Hi-Fi amplifiers as well. Close or identical. 6CA4, CV3996, CV5072, U709. File Size: 171. Downloads: 291. Watch. Experience superior audio amplification with the TAD EZ81 / 6CA4 Premium Selected Rectifier Tube. 07. Replaces 6CA4 or EZ81 tube types. The JJ is a proper indirectly heated recreation that has the correct voltage output and feel. The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 70 mm tall. Groove Tubes SS6CA4 EZ81 Rectifier Tube Replacement For 6CA4 Brand New Bargain Price, Free Shipping! Brand New. Prior to the EZ81 Mullard designs used the GZ34. Details. 6CA4 Substitutes. 33AA21-5-31 dated 17 January 1962. Also used in many audio amps and in old tube radios. It is designed to operate from the same filament supply as the other valves in radio or amp. Instrument Accessories. 08. = 160 150 100 ma c = 50 50 50 µf u D. Rated 4/5 based on 1 review. If there is no significant drop of heater voltage and the PT does not get hotter than normal (after an hour or so), you're safe. jersey_aaron. Files are available under licenses specified on their description page. 00. This was specified in the late 1950s and 1960s when greater power was required. 6CA4 = EZ81. ••• Mar 9, 2005 · The EZ81 has a series resistance of 230 ohms, so you could use SS rectifiers followed by a 230 ohm resistor, like Graydon does with some of his amps. This tube has gray plates and a halo getter. Also known as the 6CA4. e. Dec 27, 2022 · Most definitely. This listing has ended. Assorted brands in stock. T. Feb 3, 2005 · FW rectifier 350-0-350 90 50 300. If you can use an octal, the obvious choice is 6BY5 - cheap and plentiful. JJ EZ81 / 6CA4 Rectifier Vacuum Tube. GZ34S - 5AR4. It is brand new and we fully test all our valves to assure you of a quality product, testing on or Avo testers. 3 V, 1 A Max. 01 7 FP 1999. Professional equipment, including radar, etc. 1. Matchless in performance, it is the preferred choice for iconic amps like the Marshall 1974X, TAD 18W Plexi Kit, and Silverstone EZ81 DOUBLE ANODE RECTIFYING TUBE Components datasheet pdf data sheet FREE from Datasheet4U. 3) GZ37 (3 amp filament current) 4) 5V4G/A (Possibly lower if plate current of the power tubes is high enough) 5) 5U4/G/A/B (3 amp filament current) 6) 5R4G/A/B. This is a good site to find info: Duncan's Amp Pages For example the application data there will quickly tell you: 6X4: tpyical 70mA , 40uF max cap, 525 Ohms minimum Rseries for anodes EZ81: typical 150mA, 50uF max cap, 230 Ohms minimum Rseries . 00 each! This is a suitable replacement for any 6CA4=EZ81=U709 Full-Wave Rectifier tube type. 11% price drop. Reverb Bump. I attribute this to tube age, condition, and manufacturing variance. Common type USA tube/semicond. 33AA21-5-31S, 31 May 1985: This Publication supplements T. Alternatively, if you want more sag and lower voltages with a lot less legwork, you About This Listing. Original Price $19. EZ81 / 6CA4 TESLA rectifier tube Vacuum tubes, Capacitors, Nixie Tubes, Indicators, VFD display, LED, Sockets. Wholesale & retail trade. the tube tests good, continue the test by testing for gas (q below). This page was last edited on 20 June 2018, at 16:10. 99 Shipping. 01 4 4 1969. SpecificationsElectro-Harmonix 6ca4 Data Sheet. Connector B. File Size: 174. . The JJ EZ81 Rectifier Valve. If the EZ81 has its own filament supply you can tie it to the cathode. Vacuum Tube - 6CA4 / EZ81, JJ Electronics - The JJ Electronic EZ81 is a noval based rectifier with a rugged construction. [rmxtube-en] Tube AZ 4 or Röhre AZ4 ID1888, Full-Wave Vacuum Rectifier, Europe side contact P8A (Au P, 8SC) and Power-supply shown. It has a gray plates and an early D getter (8t1 series). 01 6 6 1969. one diode to pin 4 and the cathode to pin 8. The EZ81 (6CA4) is clearly the higher rated PCL86 / 14GW8 (~ ECL86/6GW8) ga('ec:addImpression', { 'name': '6AQ8 / ECC85', 'id': 'S6AQ8', 'price': '16. , non-MPX) that has separate AM and FM tuner sections running Rectifier Tubes EZ81 Rectifier Tube Data Sheet. 34 Kb. EZ81/6CA4 TAD PREMIUM SELECTED Rectifier Tube. 2. Aside from the sonic differences in using different types of rectifiers, a tired rectifier will reduce the voltage and current of the amp and that will have an effect on the bass, of course. pdf (100420 bytes Jun 10, 2018 · Electro-Harmonix 6CA4 / EZ81 Rectifier Vacuum Tube. Each. Specifications. Download Now. Manufacturer: NXP Semiconductors. Will work in place of: EZ81, 6CA4, 6CA4A. 3V / 1A, Vplate max Part #: EZ81. The JJ EZ81 / 6CA4 Rectifier Vacuum Tube is a high quality rectifier that will work great as a replacement for tube amp needing an EZ81 / 6CA4. Aug 6, 2021 · For a rectifier tube having a Design Center maximum current rating of 150 mA, this is hardly putting the tube in harm's way, and leaves plenty of capability to power a tuner/preamp head as well, which likely draws no more than 35 mA -- even if it is of the AM-FM Stereo type (i. This JJ rectifier tube replaces 6CA4 or EZ81 vacuum tube types. O. One of the full-wave rectifier tubes having the proper rating is the EZ81 with a maximum dc output current of 150 mA, a maximum plate voltage per plate of 350 V rms, a peak inverse voltage of 1300 V, and a cathode to heater voltage of 500 V. Order within 10 hrs 36 mins. Shop by category. Title: EZ80 Author: Tesla Subject: JHl-VC-FP-2012-05-12 Created Date: 5/12/2012 1:28:02 PM TEST DATA FOR ELECTRON TUBE TEST SETS TV-7 ( )/U - 15 June 1983. Tube prices. Heater: 6. There is more information available about tube power supply design in the Power Supply Design for Vacuum Tube Amplifiers article. 04 3 A 1957. 7) 5Y3G/B. Jun 30, 2006 · I have a tube regulated power supply PCB using 6X4, 12AU7, and EL84. Suited to the task, at 90 mA maximum current and with a required series resistance of 300 ohms to reduce the initial surge in charging the maximum 50 µF reservoir capacitor, each anode would conduct in turn when connected to either end of a grounded centre tapped mains transformer. Click the image to enlarge. pdf (608378 bytes) (fr) EZ81 : Philips rr EZ81. INSTRUCTIONS: Page 39, on second line change tube type 13BE6 to 12BE6. 03. This 1962 Mullard EZ81 / 6CA4 tube was made in Great Britain (Blackburn factory) and labeled for Amperex. Specifications JJ EZ81 Data Sheet Specifications JJ EZ81 Data Sheet Menu Login | Register Cart (0 New JJ EZ81 / 6CA4 Rectifier Vacuum Tube. Item has been added to your cart. Warning: Substitutes are given as a guide only - please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. 6CA4 / EZ81 Tube Types. The white print on the glass has the Bugle Boy label. It has been tested for shorts and gas. Tbc meter indication for tube types such as pentagrid converter-s, mixers, thyratrons, and voltage regulators (listed below) is not a true and conclusive mcaslwcmrnt Theof the tube condition and value. View JJ EZ81 tube data sheet. thdtheqncotphxcmryaj