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Old 15th March 2008, 02:46 PM   #1
Cobra2 is offline Cobra2  Norway
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Default Counterpoint SA-1000

I need some data on this unit; How much gain does the line-amp give, and how much the phono-amp give, in high & low position.
I have found that it can give a total(max) 70dB, but not specified...

Arne K
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Old 16th March 2008, 02:50 PM   #2
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Hi There;
The information I have is that the high gain phono is 70dB (MC I guess); low gain is 58dB and line is 25 dB.

This info is from a partial manual that I have.

Matt
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Old 16th March 2008, 04:03 PM   #3
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Thanks!

A bit higher line-stage-gain than I need...

Any suggestions to improve this unit? And to lower gain?
- rewire/adjust to 5687 tube?
What lower gain tubes with 6DJ8 pin-out can fit?

Arne K
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Old 16th March 2008, 04:24 PM   #4
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H There;

Be forewarned I'm not a tube expert by any means. Much more at home with solid state.

I'm not sure that simply changing the tube would do it. Maybe but I'd probably reduce the size of the resistor in the plate. It would be a good idea to do some SPICE sims on this to see the effects as well because you may also limit the O/P voltage swing if you're not careful.

25dB is nearly 18V/V gain and I too have no idea why anyone would want it so high. His (Michael Elliot) SA0-100 power amp is the same way. Too much gain and the driver to the MOSFETs is running a bit current starved. This is something else I would want to ook into when I get time.

Matt
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