toner wrote:I didn't look at a schematic for that amp but, in general, the slope R affects mids much more than bass. Switching from 100k to 200k will probably scoop a lot of mids and gain, while only affecting the bass a little bit. If you're really set on modding it, I'd suggest finding a few coupling caps or cathode bypass caps to lower to reduce bass.
toner wrote:I looked briefly at the schem but I've never played one of these amps so these are just general ideas. If it has too much bass with the bass pot on 0, changing the pot won't help.
I think changing C1 to around 2.2uF would help more than changing C2, but that should help too.
- change bass cap (C6) from .1uF to .022uF (if you didn't change already)
- lower or remove V2a cathode bypass (C8)
- change output couplers (C25 and C26) from .1uF to .022uF
You could also look at adding mids/treble, like raise the treble cap (C5) to 330pF, etc.
SteadyEddie wrote:I'm not familiar with the Blues Deluxe but a big thing with Fenders is that they are bassy. I've got a Super Reverb and I have to turn that bass pot down to 3 or so when I'm really turning that amp up. I tried reducing the bass in other parts of the circuit and nothing sounds as good. I've tried reducing the cathode bypass cap and PI caps and it sounds better just to turn the bass pot down. Don't be afraid to crank it down. When you're playing with a band, it won't sound thin, believe me.
Other things that help are good quality signal caps, especially in the tone stack. I find CDE DME 1KV caps have a very tight response in the bass and sound good in the tone stack and as PI caps.
Froumy wrote:For me, Kill unwanted bass early, add later...
I'm not sure your 22uF to 10uF will be audible. I'd remove the bypass altogether, and start with if a .68uF or so, if necessary. Toner has some good things to try, too.
If you look at a modern amp, say the tiny terror, you'll find all the saturation resides in the highs. Same path Marshall went down, long ago. Sounds like you've got the math, but remember those stages are stepped to the next stage, and things will be compounded. You can pull some "cleaner" bass back later, which may be the balance you're looking for-not certain. I'm guessing your love for the blonde amps is going to have you searching for the right balance for a while. Right on!
For me, I'd drop the bottom early, force some mids(taste/Strat player), and make sure some clean Fender bottom presented itself at the end....
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