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In Reply to: RE: So taking that stress off the 6922 tube - can I use or try other 6922 tubes? posted by Caucasian Blackplate on June 04, 2015 at 09:54:32
Are you saying to put an attenuator between the preamp and amp?
say for a 25db attenuation use a 85k resistor in line with a 10K to ground.?
charles
Follow Ups:
Yes, attenuation at the amplifier is a very good idea (or buying a preamp with a realistic design to begin with).
The amount of padding will depend a little bit on how sensitive the speakers are and how sensitive the amplifier is.
The 85K/10K combo will provide 20dB of padding. You will typically see morel like 8.5K/1K, which is more immune to the resistor installed across the RCA jack in the amplifier, and less likely to pick up noise when used.
So I'll try a 10k line 1K ground shunt coming out of the preamp to the amp input. I'm using the 10K because I have a 1/4 watt metal film of that value.
I'm at the plug and play part of my life. When I decided on this preamp I didn't sign on to having this kind of problem. I did do some research before choosing this preamp. And in all sincerity I had visions of rolling 6922 tubes dancing in my head. The one joy I have with tubes. Sonically I have no complaints. but truthfully if I was aware of this problem - eh - who knows?
Thanks
Charles
Be sure to use it right at the input of the amplifier, not the output of the preamp.
Harrison Labs makes a -12dB in-line attenuator that's easy to use. Sadly, it's not enough of a pad for you, but it's a good start.
Also, if you have level trim pots at the input of your amplifier, you can crank those way down to the same effect.
Is this basically the same if cranked up around a third or half way? This amp has a 100k variable input and 10K fixed switchable input.charles
Edits: 06/05/15
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