Vacuum Tube Supplies not only sells tubes, we also specialize in full service of vacuum tube audio equipment.  This includes:
 

**Audiophile vacuum tube pre-amplifiers and power amplifiers

**Guitar and other instrument vacuum tube pre-amps and power amplifiers

**Vintage radios, ham radios, communications receivers

We offer analysis, diagnosis and repair of vacuum tube equipment.  You are very welcome to to stay in our service lab while we evaluate your valueable equipment!  We can provide detailed test and evaluation reports for your equipment.

We have specialized test equipment:
 

**HP334A Distortion Analyzer capable of measuring distortion in the audio range below 0.01%

**Tektronix Spectrum Analyzer Model 7L5 with tracking generator (option 25, L3) which is capable of measuring frequency <10Hz and up to 5 MHz less than 5uV

**Tektronix Signal Generator/Source that can deliver a sine wave I/P of <0.03% distortion through the whole audio range. Imperative for accurate distortion measurements

**General Radio Output Power meter Model 1840-A

**High performance 400MHz storage scope Tektronix model 7854 with numerous plug-ins

**High end Hickok vacuum tube testers models 539C, 539B which can test almost any tube as well as match pre-amp and power tubes for plate current and Gm. (trans-conductance/mutual conductance)

We also have numerous other test equipment including power sources (AC and DC), Variacs, Oscilloscopes, digital test meters, general purpose signal generators etc.

We use various speaker cabinets for the ultimate test for sound, Wharfedale, Fisher and others. 

Give us a try!