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In Reply to: ARC SP8 valve positions and tube rolling question... posted by Dr Rock on March 21, 2006 at 13:15:28:
V1-V3 are phono
V4-V6 are line levelAll of the tubes, V1-V6, are used when playing vinyl as the phono stage is further amplified by the line stage.
Furthermore:
V1 is the most critical for noise for phono playback, but V2 has just as much impact sonically
V4 is the most critical for noise for CD or other Aux inputs, but V5 also has as much impact sonically.If you are going to be picky about what to buy first, I would try to get the lowest noise and least microphonic tubes for the phono stage V1 and V2. The work on the line stage for at least equal in sound quality, if not the best pics for noise.
Both V3 and V6 are cathode followers for their respective stage and are the least critical sonically.
Follow Ups:
I have a SP8 II and I always believe V1 and V2 are for phono, V3 and V4 are most important for line stage, V5 and V6 are follower, V7 and V8 are power supply.
Am I correct or not? Please let me know if I was wrong.
Vs 3 and 6 are cathode followers.
MJL, please see above.V1-V3 are lined up parallel with the right side of preamp as viewed from front, with V1 the first tube closest to the back of the preamp (allows for shortest path from the Phono input jack to the first phono tube). V3 is the last in line in the row coming toward the front of the preamp and is a cathode follower.
Line level tubes are V4-V6 lined up parallel with the front panel with V4 closest to the left side panel as viewed from the front. As in the phono stage, the last tube in the row, V6, is a cathode follower.
Thank you very much!
Ah yes, I did get the positions slightly wrong :-)So, I'm thinking I can just play about with the line stage valves, V4 and V5 on their own, not worrying about them being affected by the phono stage valves, right?
Then I can set about the phono stage valves....
.
"Scruffy Fran says the truth is out there" ARC SP-3C, ARC D400MKII, Tympani 1D, Creek CD50Mk2
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