Tube Testers and Test Equipment

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Quality Test Instruments for Technicians or Hobbyists

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t2Heathkit T2 Signal Tracer, rebuilt, with RF/AF probe – $79 free ship USA.

A signal tracer is one of the most useful test instruments you can own. The uses are endless. This quality Heathkit T2 has been rebuilt and has rebuilt RF/AF probe (probe is not Heathkit, but is custom-built and very nice).

This model is probably the easiest signal tracer to use, extremely simple, no-frills.

  • new capacitors (including 500v rated, brand-new electrolytics in the power supply)
  • Murata X1Y2 class safety line capacitor
  • new polarized line cord
  • new 6K6 power output tube
  • new output transformer
  • all switches properly cleaned for perfect continuity, including AC power switch
  • I built a probe for you using the Heathkit T2 design schematic, works great
Heathkit T2 - $79 free ship USA

Heathkit T2 – $79 free ship USA

For simplicity and because one of the transformers was replaced, the signal tracer is now hard-wired as a signal tracer, which means that the seldom-used “substitution” features are not available.  Honestly, no one uses those features — such as trying to use the signal tracer as a temporary output transformer, etc.  In 20+ years, I never once felt compelled to use a signal tracer in that manner.  If anything, eliminating those “features” increases reliability (less chance of burning out the internal transformers) and increases simplicity of use.

Photos below show me using this signal tracer to trace signals in a typical All-American-5 tube radio.  (Radio not included, obviously).

tracer signal at one RF coil

tracing RF signal at one coil

tracing signal at another RF coil

tracing RF signal at another coil

tracing AF signal at volume control

tracing AF signal at volume control

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EMC 206 tube tester

EMC 206 tube tester

EMC 206 Tube Tester – $199 free ship USA

EMC 206 is a very rare model of tube tester, and not much documentation exists. This unit is in excellent cosmetic condition in my opinion — really nice real hardwood case. I installed new feet on both sit-down sides.

This model was marketed as a mutual conductance tester, though it is not a true mutual conductance test circuit. To give you a summary, this model uses AC voltages on the plate and screen, and AC and DC on the grid. The DC bias is variable and taken from the DC bias pot; the dc bias was rectified by the 6H6 tube inside. The line control is also rectified by the 6H6 tube. Thus, it is a unique test circuit, different from a “dynamic conductance” circuit (such as a Jackson or Eico 667) because it applies a DC potential to the grid, but not a true mutual conductance test circuit such as a Hickok or B&K (which applies pulsating DC voltages to the plate and screen). The sensitivity control is only applicable to diode-rectifier testing, or amp tube testing when using the red-green indicating scale.

As noted, the only documentation that exists is a small instruction manual, a copy of which is included. No schematics or calibration procedure are known to exist, at least not to my knowledge.

As tested, the shorts sensitivity is rather sensitive, approx 1.7 megohms. The gas test is extremely sensitive (in fact, a degree of common sense and comparison with other known-good tubes will be necessary for the gas test.) Photos show test results from 5U4GB and 6L6G using the good-bad scale. Test results for these tubes are more than reasonable, as both tubes are well-known to me.

Limited servicing was done. I replaced a number of out-of-spec resistors and cleaned all of the controls. The unit is not “calibrated” because no calibration documentation exists, and no representation regarding performance is being made.

This tester has a basic roll chart, so it would be best considered as a tester of “antique tubes.”  It would be a good affordable compliment to a newer-style tester — such as Mighty Mite, B&K, or similar — because you would be able to test the popular antique tubes.

testing 6L6

testing 6L6

testing 5U4

testing 5U4

emc206-3

beautiful front panel

emc206-2

beautiful hardwood case

EMC 206 tube tester (uncalibrated, as found) $199 free ship USA

EMC 206 tube tester (uncalibrated, as found) $199 free ship USA

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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.

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Filament transformer 45A - $44 free ship USA

Filament transformer 45A – $39 free ship USA

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