Mark Kawecki Tube Museum New York





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AMPLITREX TUBE TEST SERVICE for Western Electric 242-C TEST SERVICE for Locking Socket tubes 845 211 VT4C or 9-pin preamp tubes
AMPLITREX TUBE TEST SERVICE for Western Electric 242-C TEST SERVICE for Locking Socket tubes 845 211 VT4C or 9-pin preamp tubes
TubeMuseum Complete Digital-Verified NOISE, mA, & GM measurement test Report of your tubes on our Amplitrex AT-1000 Digital Tube Test System
 
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Description
 
This listing covers a complete report of your tubes:
The Tube Museum Tube Test Service:
The Tube Museum Test performs seven audiophile-grade (7) tests on your ten (10) tubes,
Or, four quantity (4) 211A type bayonet-base power tubes at real world power levels then delivers you the results:

CHOOSE EITHER:

Ten (10 ea.) x preamp tubes or small power tubes (12AX7, 6V6GT, EL84 type., etc.)

or

Four (4 ea.) of large 211A type power tubes.(VT-211, Locking Socket tubes 845 211 VT4C, etc.)

1) Visual Inspection and Date and Factory Identification
2) Heater-to-Cathode leakage Digital readout(omitted for directly-heated tubes)
3) mA/V Emission Test Digital readout (and Heater to Cathode leakage)
4) GM Digital readout Test ( Transconductance/ mutual conductance test)
5) Gas Test in milliamperes and Noise Test
6) Identify tubes with microphonics for preamp applications
7) Free System Upgrade Recommendations
ARE YOUR AUDIO TUBES
LOW-NOISE or NOISE-FREE?
NOW YOU CAN FIND OUT!
Who may benefit from the Tube Museum Tube Test?
1. You have recently purchased a tube amp and need to know the health of the vacuum tubes in it.
2. Your tube amp just dosen't sound like it use to, could the problem be in one of the tubes?
3. You recently purchased audio tubes and need to know the REAL specs, mA/V, gm, and if they are noise-free.
4. You have a collection of tubes, and want to put together the best of the tubes you have.
VERIFY YOUR TUBES for LOW-NOISE at the TUBEMUSEUM
TubeMuseum tube testing takes the guesswork out of the process of selection delivering you the most accurate audio tube measurements that there possibly can be.
Is it worth getting a completly-verified NOISE-TEST & mA, gm measurement test?  Absolutely!
ACTUAL DIGITAL READOUTS TESTED AT REAL-WORLD POWER LEVELS!
TUBEMUSEUM USES a 3-STEP NOISE TEST PROCESS: See the .0 mA Gas reading in the lower right hand corner of the LCD ?, this is the first step.  We test hundreds of tubes - and zero readings are rare select few and far between - most tubes have some noise, about .4 to .6mA sometimes as high as 2.0 or even 2.5 Gas right out of the SEALED NOS box! Very few tubes can claim a PERFECT (.0) zero reading - and unlike our academic past, zero in this case is PERFECT!  Do you know what your tubes measure in noise? Ask us to help you find out more about noise and how it plays a part in degradation of real true to life sound reproduction in your system.
Is it worth getting a completly-verified NOISE-TEST & mA Report?  Absolutely!
With preamp tubes like a 12AX7, anything more than 1.0 milliampere of gas current will likely cause problems in the application circuit. Noise may be excessive, and/or the tube may not establish its correct operating point.
Find out if your tubes are Noise-Free Audiophile-Select Preamp Grade.
CERTIFY YOUR TUBES are NOISE-FREE for PHONO-GRADE SPECIMENS
Take special notice, as it is the tubes most important result of the “mA Gas Test”. During the Gas Test, the grid circuit source impedance is increased 10 times. Plate current is measured before, and then again after the impedance is altered. If there is residual gas inside the tube, the ion current flowing in the gas between the plate or screen and the grid causes the grid to become more positive or less negative. This produces an increase in plate current, this difference is the value that is displayed in milliamperes.
Be Wise,  If you care about perfect performance in your stereo application, you must know if your tubes have balanced triodes, the noise-level, and mA/V per triode!
CERTIFIED ULTRA-LOW NOISE-FREE TESTING SERVICE
Terms and Procedures of Service
You are responsible for shipping your tubes to and from the TubeMuseum in New York. Ship your tube(s) to us for a complete state-of-the-art digital bench-check and report.  ACTUAL photo-documentation of the digital readout as shown in this ad for YOUR specific tube(s) will be emailed to you .  The unit service charge does not include return shipping of your tube(s), you purchase your return shipping when completed.  We treat your tubes as if they were our own. We are not responsible for tubes received damaged, defective tubes, or DOA's. You will be notified immediately upon arrival if your tube is inoperable. You are responsible for packing your tubes in a safe manner and sending them to us by USPS with delivery confirmation. Upon receipt we will acknowledge your delivery, test your tubes, email you the digital photo-report and return them (postage pre-paid) to your confirmed paypal address.  
Price listed is per 10 tubes. If you want one (1) ten-tube tube test bid (1), if you need two (2) ten-tube (that's 20 tubes) tube-test bid two (2), etc...  
"...Dear TubeMuseum, As you know, I took your advice about zero-noise and low-noise tubes for my McIntosh tube amp and I’m overwhelmed with the results! I’m not listening to the amp anymore; I’m listening to pure music – as if bypassing the amp completely! I don’t hear the amp anymore I just hear music – I should say hear and feel like I have never felt before shivers up my spine, anticipating the next note, the next instrument to announce itself!  When there is silence – it’s like a vacuum in space! Thank you Tube Museum and Mark Kawecki again for helping me to achieve what I could never achieve before…. sonic nirvana” – George

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