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In Reply to: RE: Rotel RB-1092 and tube preamp posted by xtsili@grnet.gr on September 12, 2014 at 01:18:44
If you go with a tube preamp:
Rotel's have a coupling cap at the input; tube preamps have them at their outputs.
Going with a tube based preamp will cause a "fight" for the corner Hz as well as really muck up the tone.
I suggest replacing the Rotel's input coupler with a jumper wire.
Cheers,
W
Follow Ups:
What you are suggesting is getting too technical for my knowledge. Could you elaborate a bit?
xtsili
The simple - Only one coupling cap is needed in-between a preamp and an amp. Tube preamps have a coupling cap. Some (not all) SS amps have them as well.
When this scenario exists the coupling cap in the amp needs to replaced with a jumper wire.
SS > SS and tube > tube works fine. When mixing the two this issue may arise and needs resolution.
You won't notice the gross sonic degradation until the Rotel get some surgery. It's easy to find/fix from the schematic.
Thanks so much. It is much clearer now. To be honest a tube pre I tried once with my amp delivered impressive results. At least this was my impression.
xtsili
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