For a larger amp I'd just get an 18W amp.
![Mr. Green :mrgreen:](./images/smilies/icon_mrgreen.gif)
That's a very useful frequency range.johnnyreece wrote: ↑Tue May 07, 2024 1:47 pm My range is now (from memory) 2.6-4 Hz on slow, 3.9-9.6 Hz on fast.
That's not what my schematics show. That 2.2K is the PI cathode resistor and it connects to ground. Same for the ga50 and ga50T. Has nothing to do with the bass pot.
Show us what you are looking at. The AB763 Deluxe Reverb was only produced between 1963 and 1967!