Should you wire the input signal from the potentiometer to the same half of each valve for both stereo channels?
If the schematic shows the input going to pin 4 of a 6SN7 would you do that for both channels? This seems both logical, and symmetrical to me, but I notice that JSound Lab (from Israel) show photographs on Ebay where one channel inputs to pin 4, the other channel to pin 1.
Is there a good reason for this?
I know both halves of this double triode are identical.
If the schematic shows the input going to pin 4 of a 6SN7 would you do that for both channels? This seems both logical, and symmetrical to me, but I notice that JSound Lab (from Israel) show photographs on Ebay where one channel inputs to pin 4, the other channel to pin 1.
Is there a good reason for this?
I know both halves of this double triode are identical.
There would be little difference either way. However, if you are using a whole 6SN7 in each channel then there seems little point in wiring the two channels differently. For a start it could confuse subsequent fault-finding.
Sometimes people use two identical valves by using two halves per channel. That can make it easier to keep small circuit loops.
Sometimes people use two identical valves by using two halves per channel. That can make it easier to keep small circuit loops.
I had always thought that the best channel balance would come from splitting each tube and (assuming matched halves) putting both channels into each double tube, ie one tube carrying both input gain stages, one tube carrying both concertina phase splitters...
But then again, there are an awful lot of high end mono blocks out there, and if the boys playing at the big end of town don't need matched halves on their tubes for good performance, maybe it's not as critical as one might think...
My current practice is to use a separate tube on each channel, so each tube carries the gains tage and the phase splitter for its own channel alone.
Not sure there's actually much of a functional difference, aside from the fact that you can't flavour the sound by tube rolling and changing out a single tube (NOS RCA MIL red base for the input tube for instance), instead you gotta buy two...
But then again, there are an awful lot of high end mono blocks out there, and if the boys playing at the big end of town don't need matched halves on their tubes for good performance, maybe it's not as critical as one might think...
My current practice is to use a separate tube on each channel, so each tube carries the gains tage and the phase splitter for its own channel alone.
Not sure there's actually much of a functional difference, aside from the fact that you can't flavour the sound by tube rolling and changing out a single tube (NOS RCA MIL red base for the input tube for instance), instead you gotta buy two...
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