I have a C5P preamp and P30K amp for sale in Germany.
Not a DIY but very easy to modify and upgrade for diyers. The C5P is one of the best preamps you can get for the price. After upgrading the coupling input/output caps you will hear one of the finest preamps you ve ever heard.
Upgrading the rectifiers, resitors and wiring will bring it to a higher level.
Take a look here:
Upgrading a valve pre: Unison Research C5P
Unison Research C5P valve preamplifier.
Not a DIY but very easy to modify and upgrade for diyers. The C5P is one of the best preamps you can get for the price. After upgrading the coupling input/output caps you will hear one of the finest preamps you ve ever heard.
Upgrading the rectifiers, resitors and wiring will bring it to a higher level.
Take a look here:
Upgrading a valve pre: Unison Research C5P
Unison Research C5P valve preamplifier.