I've had quite a few forum guys post or PM me about the "one tube reverb". First off, it's NOT my design. I "stole" it from the D'Lite builders who were using it. I have used other methods for adding reverb that also worked including Hoffman's "add reverb to Western Circuit". But this one has worked the best for me.
It has worked on every single amp I've tried it on without a problem. I have it on the 3 amps I currently own and play. No oscillation issues at all.
This uses the "Fender" type replacement reverb transformer and tank that Hoffman sells. Same one you'd use for a Princeton Reverb.
I have owned a Princeton Reverb and played numerous AB763 Fenders. Comparing this to those, I like it better because:
1) it uses just one tube, 2) it verbs more mids (for a fuller tone to my ears) and 3) I don't do "surf" stuff even though I like that sound. I honestly prefer the tone of this reverb more than the Fender but again that's just my preference.
With my PR, I used the reverb on around 2.5-3 With the one tube reverb, I use it on about 3 or maybe 4-5 on a slow blues tune. Originally, the design had a 2.2M reverb pot but I changed that to 1M to reduce the reverb, I also added a dwell pot to reduce the reverb. I typically have the reverb pot at 3 and dwel pot at 5-7 & that gets me the reverb fullness and tone that I want. It has waaaayyy more reverb than I'll ever use.
If you want to see examples in a circuit. Look at the Blues Amp, 56T reverb or my 5879 Carolina Blues Special ......OR
the Carolina Blues Special that was made for my friend Gene. They are all in the SCH library. It has worked on an 18watt type design (reported to me), and I have had success using this reverb with concertina phase invertor, & long tailed phase invertor type amps.
With respect, Tubenit