Tube Testers and Test Equipment

FOR SALE

Quality Test Instruments for Technicians or Hobbyists

*Free standard shipping for all test equipment and accessories on this page.

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Sencore Mighty Mite with original box

Sencore Mighty Mite with original box

Sencore TC162 Mighty Mite VII professional tube tester with original box and original hang tag, serviced and calibrated! – $379 free ship [HOLD FOR CUSTOMER – SALE PENDING]

Here is a real nice original Sencore TC162 Mighty Mite tube tester. Includes original box and original advertising hang tag!  Also includes copies of our TubeSound remastered manual and setup chart book.

The circuit has been substantially rebuilt, including all new resistors in it.  All carbon load resistors tested and replaced, where necessary, to bring into 5% tolerance.  Recapped the power supply and several other new caps in the circuit board.  All socket pins hand-polished and then treated with Deoxit.  All switches and controls cleaned with Deoxit.  A grounded line cord is installed.  Finally, I calibrated this beautiful test instrument.

The TC162 Mighty Mite is popular among technicians because: (1) complete solid-state design for extreme reliability, (2) full load cathode current test method with Life Test option, (3) ultra-sensitive 100-megohm leakage test, and (4) thorough shorts test due to a full compliment of lockout switches that prevent false shorts or miss real shorts. Made in USA.

Fantastic opportunity to buy a quality test instrument, with original box, nice condition, professionally serviced and calibrated.

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testing 6L6

testing 6L6

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Shorts calibration

Shorts calibration

Leakage calibration

Leakage calibration

Emission calibration

Emission calibration

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Sencore TC162 tube tester with box $379 free ship USA

Sencore TC162 tube tester with box $379 free ship USA

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EICO 1030 high voltage regulated DC power supply

EICO 1030 high voltage regulated DC power supply

EICO 1030 High Voltage Regulated DC Power Supply, rebuilt – $269 free ship USA

Rebuilt and calibrated is this very nice condition American-made EICO 1030 High Voltage Regulated DC Power Supply. In my opinion, a quality regulated high-voltage power supply is one of the top two pieces of test equipment that you need in your shop, if you work with tube gear. You can really never have enough power supplies. Basic specs are:

  • 0 – 400V DC @ up to 150ma continuous.  Separate voltage and current meters.
  • 0 to -150 bias DC
  • AC filament supplies: single 6.3 vac @ 6A (or dual 6.3vac @ 3A), or 12.6vac @ 3A
  • low ripple
  • good regulation

Cosmetically, very nice in my opinion. Use instructions will be included.

Electrical servicing consisted of:

  • new capacitors installed
  • inrush current limiter installed
  • solid-state rectifiers (with additional inline axial fuses installed, for better protection of transformer windings.  If you overload the unit, internal fuse may blow, and you will be happy to replace a fuse.)
  • new 3-wire grounded line cord installed
  • new pair of factory matching Sovtek 5881-6L6WGC pass tubes has been installed
  • careful cleaning of unit, inside and out
  • calibrated
  • low ripple, nice clean output, measured in most instances at 5.0mv rms or lower with my Fluke
  • good regulation as checked against varying line voltage and varying load
Photos below show the power supply, and show the power supply driving full continuous output of 150ma load @ 400vdc.
NOTE: high voltage power supply can be a very dangerous (lethal) test instrument and is only suitable for an experienced electronics technician; do not buy if you are not qualified to use it safely.

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closeup showing the power supply driving a 150ma load @ 400vdc

closeup showing the power supply driving a 150ma load @ 400vdc

EICO 1030 HV DC regulated power supply

EICO 1030 HV DC regulated power supply $269 free ship USA

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Heathkit T3 AF-RF Signal Tracer

Heathkit T3 AF-RF Signal Tracer

Heathkit T-3 AF-RF Signal Tracer, beautiful condition, professionally serviced, 2 new probes – $139 free ship USA

This T-3 Heathkit signal tracer is in beautiful original cosmetic condition. I have done a lot of rebuilding inside (many new caps, etc), and replaced tubes where needed. Magic eye tube is very bright. I also built 2 new probes — one for RF (radio-freq), and one for AF (audio freq).

Outstanding piece of test equipment for servicing antique radios or audio amps. Photos below show testing a tube radio, first by signal tracing at the RF stage, then using the audio probe to signal trace at the volume control. The radio is not part of the sale, obviously.  As a courtesy, I can email a PDF of the manual to the buyer.

signal tracing RF stage

example: signal tracing RF stage

example: signal tracing AF stage at volume control

example: signal tracing AF stage at volume control

Heathkit T3 Signal tracer $139 free ship USA

Heathkit T3 Signal tracer $139 free ship USA

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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

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beautiful front panel

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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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I-177B serviced and calibrated, with MX-949A

I-177B serviced and calibrated, with MX-949A

Signal Corp I-177-B tube tester, manufactured by Simpson, with rare MX-949A/U socket adapter kit, nicest I-177B and MX-949A that I have ever seen or owned, tester serviced & calibrated, $799 free ship USA. [HOLD FOR CUSTOMER – SALE PENDING]

(This combo sells as a pair; I will not sell the MX-949A/U separately.)

Here is the nicest I-177B and MX-949A/U that I have ever encountered (either myself or sent to me for repair by a customer), this combo has been a part of my personal collection for close to 15 years, tester made by Simpson. The Simpson-manufactured units are extremely high quality and well laid-out inside. I am including the very rare MX-949A/U socket adapter kit. Both items are in really outstanding condition.

I have serviced & calibrated the Signal Corp I-177-B mutual conductance tube tester.  Servicing consisted of replacing the #83 tube with my solid-state fused upgrade, checking the 5Y3GT tube for excellent balance with my oscilloscope, cleaning all pots, switches, controls with Deoxit. Socket pins cleaned and shine very close to when new. Many original carbon comp resistors were replaced with fresh modern carbon-film or metal-film 5% or better. Recapped. Brand new grounded line cord installed and with new rubber eyelet grommet. Line calibration performed. Calibration voltages checked & set for accuracy (150v plate 1000 ohms/v, 130v screen 1000 ohms/v, accurate bias voltage checked at several positions of the bias pot, signal voltage 5.0 vac), overall calibration checked against my calibration tubes. Diode/Rectifier/0Z4 test functions checked for accuracy. Gas test checked for accuracy. Shorts test checked for proper working condition. General cleaning inside & out.

Includes original tube data setup book. No other paperwork included, but tester instruction manual and additional supplements can be downloaded or forwarded via email PDF.

The I-177 series is a quality mutual conductance tube tester, Hickok-style circuit, and designed for testing older tubes, pre 9-pin-miniature. The MX-949A socket kit adds a lot of flexibility to testing (such as testing 9-pin-miniature and septar base tubes), but honestly it is somewhat of a pain-in-the-butt to use the socket adapter and therefore should be considered as an extra that you would use on a very rare occasion. It does come in handy if you want to test rare transmitting septar-base tubes on the rare occasion that you need to. Overall, I highly recommend the I-177 series as being great for antique radio servicing or tube collectors that require setup data for oddball old military tubes.

I-177B with MX949A - $799 free ship USA

I-177B with MX949A – $799 free ship USA

When considering to buy an I-177 tester, even though the socket adapter kit is included, I can tell you that the I-177 series is not ideal for someone who only wants to own a single tube tester, because testing 9-pin-miniature or newer tubes is slow and cumbersome because you need to use the MX-949A socket adapter kit. In a nutshell — if you want a top quality vintage military tester for testing primarily the old basing tubes, then this is an awesome choice. It does a great job of testing the old 4-pin, 5-pin, 6-pin, 7-pin-large, etc… types of tubes because you do not need to use the socket adapter kit. Therefore, if you need to test 9-pin-miniature tubes more than rarely, you really should look for a different tester.

What many pro’s do — they will pair this I-177B + MX949A combo with a newer tester, such as a Sencore Mighty Mite or B&K, which provides them the capability to test the overwhelming majority of USA tubes ever made.

Photos below show the outstanding condition of the I-177B tester and the MX-949A/U socket adapter kit. Photo also shows accurate testing of my 6L6 calibration tube (not included).

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accurate testing of 6L6 calibration tube

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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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