Tube Testers and Test Equipment


Quality Test Instruments for Technicians or Hobbyists

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B&K 600 tube tester - $235 free ship USA

B&K 600 tube tester – $235 free ship USA

B&K 600 Tube Tester, serviced and calibrated – $235 free ship USA.

Here is a nice tube tester, a compact B&K 600 Dyna-Quik. If you want a compact very-easy-to-use tester, this model is a great choice. B&K quality at an affordable price.

Model 600 has an excellent leakage test, a good shorts test (my calibration increased sensitivity to at least 1.5 megohm at typical line voltage), and a solid emission test. Combine that with a sensitive high quality meter and solid build quality, and you have a winner.

Test sockets for tubes from 7-pin-miniature thru 12-pin compactron. Model 600 does not have test sockets for antique tube types, such as antique 4-pin, 5-pin, or 6-tube tubes. Original tube data setup book included. 2 Built-in tube pin straighteners are a welcome and popular feature for this model.

BK 600 tube tester $235 free ship USA

BK 600 tube tester $235 free ship USA

Servicing consisted of installing a new grounded line cord, complete rebuild of the leakage test circuit (all new resistors and capacitors, and new leakage calibration control pot), rebuild of the shorts test (new resistors and caps), emission calibration, cleaning all pots, switches, and controls with DeOxit, installing new rubber feet on underside, and an overall general cleaning inside and out.

Photos below show testing of 4 nos-new popular tube types: 6KD6 compactron, Sovtek 5881 – 6L6GC, RCA 12AX7A, and Sylvania 5U4GB. Tubes are shown only to demonstrate working condition; these tubes are not included.


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precise111professional PRECISE 111 Mutual Conductance and Emission tube tester, AS-IS, $179 free ship USA

This tester is not serviced, therefore repairs and/or calibration will be required. Sold AS-IS. Case is missing leather handle.

True high-end professional tube tester.  Just about as “high-end” as you can find among vintage USA testers.   Precise 111 tube tester. Mutual Conductance and Emission testing.  Selectable plate voltage & screen voltage, variable grid bias, and panel meter reads operating voltages so that you can make voltage adjustments on the fly for most accurate test. Probably the best tube tester that you may not have heard of. A bargain among tube testers, assuming you are willing and skilled enough to do a standard service job on it.

I removed and tested the panel meter for correct mV at full scale, then reinstalled.  The tester also has a new grounded line cord, and several caps were replaced with new.

I do not repair Precise models because I do not see them often enough to invest the time to become highly knowledgeable about them. If you want to invest the effort to service/calibrate, this Precise tester has a lot of “specs” that are impressive:

  • variable plate voltage
  • variable screen voltage
  • variable bias, 0-10v and 0-50v
  • ability to test both Gm and Em for applicable tubes
  • metered Bias to verify that you are applying correct bias voltage according to setup chart
  • metered Line voltage
  • gas test

You can download the manual and service information at this LINK.  Take the effort to read that manual, and you will see that this is quite an impressive and extremely professional tube testing instrument.  Well worth the effort if you plan to keep the tester for yourself.  The manual also has detailed calibration procedure.

Photo #1 below shows testing of a russian 6L6 (test score is high, illustrating need for calibration/servicing.  Tube not included).  No further or extensive testing was performed.  Photo #2 shows the inside.

Precise 111 tube tester AS-IS $179 free ship USA

Precise 111 tube tester AS-IS $179 free ship USA



massive 45A filament transformer

massive 45A filament transformer

powerful 45-AMP Filament transformer 6v – $39 free ship USA

Here is a whopper for your tube projects! A massive 45-amp filament transformer. Nominal input 115vac, nominal output 6.5vac @ 45A. Want to build a massive tube warmer/heater? Now is your chance. With this transformer, you can power the filaments of almost *50* (yes, fifty…) 6L6 tubes at the same time! Size: approx 4L x 3.25W x 4.5H inches.


Filament transformer 45A - $44 free ship USA

Filament transformer 45A – $39 free ship USA



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