STAX SRM-007tII amp :Tube Rolling / Bias Adjustment
Feb 27, 2013 at 7:19 PM Thread Starter Post #1 of 4

IHMEYERS

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I just picked up a used STAX SRM-007tII amp from GSTJOHN and I wanted to try out different tubes I had here including some RCA Clear Tops and some NOS Raytheons.  How do you set the bias for the amp and what are the appropriate readings for each tube?  I've found the adjustment pot but am not sure where I connect the voltmeter and what the bias should be.
 
Thanks very much in advance!
 
Ian
 
Jun 3, 2021 at 5:10 PM Post #4 of 4

ssmith875

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Did you ever find out about the additional adjustments for the the 4 tube stax srm 007t? I am assuming that the process will start with adjusting TVR3 and TVR4. There are test points (TP1 and TP2) on the PCB that can be used when making the adjustments. Each tube would be adjusted independently using TVR3 and TVR4 to balance the output as read from TP1 and TP2. Then once that was complete the bias adjustments TVR1 and TVR2 would be adjusted as per

http://www.head-fi.org/a/adjusting-bias-on-stax-tube-amplifiers
 

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