Legin wrote:
I'm sure you could do a foldback reverb however you would need half a 12AX7 to recover it. Eddie (erl) did a fair amount of work with foldback reverb and trem, I don't know if he fitted one to an 18Watt though.
Earth to Eddie, Earth to Eddie, come in Eddie.....
![Razz :P](./images/smilies/icon_razz.gif)
Sorry for the late reply, I’ve been away from my computer for a while
![Wink ;)](./images/smilies/icon_wink.gif)
I did fit a foldback reverb to my TMB for testing (it was a stand alone unit) and it worked quite well. It is pretty much the same circuit that I used on my Lightning and the Phoenix TR. Here are a couple of pics in my Lightning (I used the other half of the tube for a bias tremolo, that’s what’s on the board)
![Image](http://www.18watt.com/modules/gallery/albums/Tremolo-Lighting/DSCF0123.sized.jpg)
here is the send jack
![Image](http://www.18watt.com/modules/gallery/albums/Tremolo-Lighting/Reverb_send.sized.jpg)
and her is the schematic
![Image](http://www.18watt.com/modules/gallery/albums/Tremolo-Lighting/reverb_7_7.jpg)
I did change the pot from 25k to 50k to get a little more reverb, much higher then that and the circuit gets to unstable. Let me know if you have any specific questions.
Eddie