[adamus]

hi,

Now my soha + jisbos is all done and cased up i have got round to a lot of listening. Cracking mids, detail i didnt know existed.

however, i am missing really low bass, the sort of none musical bass if that makes sense - e.g Faithless: bring my my family back there is a low rumbling during the chorus, i dont get enough of it compared other amps - its probably down below 30hz.

I do have it attenuated with 100k and 33k resistors (as per jisbos guidance) for a gain of 5. The caps film caps in the soha are only 220nf, is that where my problem lies?

any other areas for me to look for?

 

[Ferrari]

The interstage film cap forms together with the resitor a high-pass filter.
You might replace the 220nF film cap with a larger value (330nF - 1uF) to lower the corner frequency => prevent bass roll-off.
Use good quality film cap on this position, as long as it fit of course.

 

[regal]

I used 1uF caps with the 3422/1359 transistors and had some of the strongest bass I have heard from a tube amp.