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Is that a SRPP circuit with 6SN7?
Is that a SRPP circuit with 6SN7?
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Old 1st April 2012, 05:22 PM   #11
DF96 is offline DF96  England
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You need to ask your friend what he wants to achieve. These 'upgrades' may actually be a complete transplant: a new preamp in the old box. In many cases the 'best' preamp is no preamp at all, as a typical CD-based system does not need extra gain.
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Old 1st April 2012, 05:33 PM   #12
Tubenstein is offline Tubenstein
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Yes, you are right for "concept" in certain way. We group of friends has tried that, with no dynamics!! Gain is not an issue when dealing with CD player but what about impedance?? Impedance mismatch ruins everything.

Many mfg has built their CD player with direct output with volume pot, never success. The most important part is my friend is a vinyl guy. And he has the Counterpoint SA-9.
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Old 1st April 2012, 05:41 PM   #13
DF96 is offline DF96  England
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Almost all audio systems are intended to operate with severe impedance mismatch. Low source impedance, high load impedance is the correct way. The last thing you want in an audio system is impedance matching!

As long as you don't have long interconnects (high capacitance), high value volume pots (high and varying source impedance) or amps with low and non-linear input impedance it should be fine. The perceived lack of "dynamics" might simply be due to a lack of low-order distortion and a reduction in noise.
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Old 8th April 2012, 11:57 PM   #14
ruffrecords is offline ruffrecords  United Kingdom
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It is a high current mu follower. The tubes are simply paralleled for higher current capacity.

Cheers

Ian
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