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VAC Signature 2a Preamp Question

Before you say, "Dude, there's already a thread posted about this question!" Well, forgive me, I could not find it. This is an inquiry for Signature 2a owners who have the built-in MC/MM phono stage: When the selector is on #6, which is the turntable, I get a background hum and some of what is probably tube rush, and it's especially audible with no music playing with the volume up. When I switch to the DAC setting, with the same volume setting, everything is dead quiet. Do I have a problem or is this normal?

Your feedback is welcome and appreciated,
Alón
alonski

Showing 4 responses by zd542

zd542
5,339 posts
 
It could be a few different things, but I think the most likely cause would be that you have too much gain on your phono section. If you're using a high output MC cartridge, you need to use the MM setting. Its a common mistake. Other than that, you really need to list your entire system.
zd542
5,339 posts
 
If you're not 100% sure, try the MM setting regardless. You can't damage your system in any way. You're essentially lowering the volume, so don't be afraid to try it.
zd542
5,339 posts
 
"Everything is grounded well. It could be tube rush from the phono section tubes (the line stage is quiet)."

In case you missed it, read my post from yesterday.
zd542
5,339 posts
 
"Zd542
You are right saying, that switching to MM will likely alleviate the hum. But for a different reason.
It has to do with the SUT in the MC section picking up EMI from the PS, and not with the higher gain of the MC input."

I agree. But its just too simple not to try. Also, it can't be ruled out either because we don't know what the OP has, or how its set up. You're probably right, though, given this is a common problem with this model preamp.
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