Back when I built my Stereomour in Nov 2010, I posted these voltage readings for terminals 2 and 14:
Terminal Expected Actual
T2 230 207
T14 230 194
A year and a quarter later (different house, different tubes, all the tweaks I've done are pretty tame but they are different from base), I checked the voltage again and it was:
2010 2012
Terminal Expected Actual Actual
T2 230 207 206
T14 230 194 192
My concern is that the left/right channels are not at the same level of amplification (have always been out of balance). I have previously always been in a small room with lots of room treatments and nearfield listening, so I've sort of naturally just adjusted the speakers and treatments to compensate, so this hasn't been a big deal. Now I'm in a large room with much less opportunity for treatments and speaker placement adjustment (a nice tradeoff, actually). Additionally, my source and DAC have improved considerably since 2010, so with a more resolving system, I may be hearing new "weak links in the chain" if you will.
My question is within the circuit, would the voltage difference between the left and right channels for terminal 2 and 14 be the cause of this? And if so, which resistor value should I think about adjusting ahead of this to balance the two? If that isn't the right way of thinking about this, what would be, please?
Thanks,
John
P.S. PJ did comment that the original design voltage was 200 for T2/T14 so the variance from 230 was not a concern at all.... :-)
« Last Edit: January 12, 2012, 02:21:25 AM by InfernoSTi »
John Kessel
Hawthorne Audio AMT K2 Reference Speakers
Paramount 300B w/MQ All Nickel Iron, Mundorf S/G 5.5 uF, and Vcap Teflon .1 uF
Auralic Taurus Preamp/Auralic Vega DAC/Auralic Aries Streamer
and lots of room treatments!