Brittle gain

[jestaudio]

any suggestions to smooth the gain atouch on my marshall build, its a bit spikey and brittle at the moment, could do with getting a pinch more gain out of it if possible
Cheers Gaz

[John_P_WI]

Throw a schematic out there so we know what to work with. "Brittle" gain can be low current through a pre amp stage(s).

Smoothing can be done with preamp tube bias, preamp grid stoppers - and also playing with the values on the power tubes, and anode caps or "fizzy caps" on the preamp and PI, also caps to ground, lead dress, tube rolling just to name a few...

[jestaudio]

Throw a schematic out there so we know what to work with. "Brittle" gain can be low current through a pre amp stage(s).

Smoothing can be done with preamp tube bias, preamp grid stoppers - and also playing with the values on the power tubes, and anode caps or "fizzy caps" on the preamp and PI, also caps to ground, lead dress, tube rolling just to name a few...

Heres the scheme i worked to , no major mods apart from channel switching and a passive effects loop, i,ve tried a few differnt tubes including some nos brimar and ei,s, the speakers used are a RCF 8ohm dirver and a celestion lead 80, early 80s spec, both in birch ply half open boxs

[10thTx]

Just some ideas to consider:

http://www.el34world.com/Forum/index.php?topic=8579.0

with respect, 10thtx