Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: phsyconoodler on November 21, 2011, 04:20:47 pm

Title: FET stage for gain boost.
Post by: phsyconoodler on November 21, 2011, 04:20:47 pm

can you use an FET like Dumbles use for a gain boost instead of a 10-20db boost?In other words can you make the FET overdrive and use it as a gain stage? The reason I ask is it's easy to build the FET stage and it would be a useful gain stage in an amp.Or at least I think it would.

Title: Re: FET stage for gain boost.
Post by: jerrydyer on November 21, 2011, 05:02:14 pm

I made a pedal out of one It was ok... the stratoblaster makes a better version..

Title: Re: FET stage for gain boost.
Post by: sluckey on November 21, 2011, 05:33:43 pm

You don't know the power of the dark side.

Title: Re: FET stage for gain boost.
Post by: phsyconoodler on November 21, 2011, 05:48:51 pm

I almost heard the breathing too Sluckey!

Title: Re: FET stage for gain boost.
Post by: TIMBO on November 21, 2011, 10:59:07 pm

Hi noodler, Found this on the net when comparing a FET input and a Op amp input as see in Duncans blue amp 112(schem in dougs library under MISC) they are saying that the FET is a nicer smoother sound.  Dumble fet was mainly to boost the input signal of acoustic guitar pups.Thats about all i know.  :icon_biggrin:

http://www.runoffgroove.com/fetzervalve.html (http://www.runoffgroove.com/fetzervalve.html)