|
Title: How to increase TMB gain on 18w/ef86? Post by: gtrbarbarian on June 02, 2011, 02:59:14 PM hmm someone removed my post....
I assume asking about modding for increased gain is not against posting policy, but my post from yesterday seems to be missing. Anywho, I am looking for easy mods to increase the gain of the TMB side of my 18w/ef86 ... Any suggestions would be appreciated! -Jonathan Title: Re: How to increase TMB gain on 18w/ef86? Post by: wyatt on June 02, 2011, 03:16:46 PM All posts since Saturday are gone.
I replied yesterday, so... ...to repeat, you have a completely unused triode in the first 12AX7 (V1A; note the unused pins 1-3). This half tube is used as as the first gain stage on on Channel 1 of a traditional 18-watter, which has been replaced with the EF86 channel. This gives you an entire gain stage to use and play with. A possibility would be to introduce an additional gain stage before the TMB preamp, that's how the "Hi" channel works on a JCM800. You might as well do something with it, even if you wire the gain stage up in parallel (for a little thicker tone), otherwise you are buying for half a tube that isn't used. |