SF BASSMAN 100 bass channel mod wanted ?

[Dezzy]

I have a bassman 100, I love the normal channel, but the bass channel seems dull and lifeless, like it is in the background, when I play the normal channel and switch, the bass channel just feels flat, what I am into is that sparkle and twin kind of clean U get when the treble is on 10 lol so any ideas on how to do that with this bass channel ? I am very grate full to you guys thanks, the amp is going to the amp tech next week I think, he is looking over the schematics before I go, but it would be nice if I had some good info to run by him, and make things simpler, cheers

[Jazz P Bass]

What is the input?
A guitar or a bass?
You may or may not get away with an easy mod on the bass channel, as far as playing a guitar through it.
The channel was specifically designed to amplify bass frequencies.
Not a guitar.

[Dezzy]

I play guitar only, when I looked at the circuit, it seems if someone was to know what they were doing they could easy change things around on their, and make it like the normal channel, I have been told it can be easy done, but not sure how myself due to it not being my field ect

[Jazz P Bass]

Sorry, I was thinking of the 50 watt circuit.
Yeah, the first stage cathode bypass cap is different.
Along with the coupling cap at the volume control.
Plus the Bass channel has that deep circuit on the tone stack.

[Jag]

I'd start with something like this. It should sound good for guitar, and be a little different than the other channel.

[Dezzy]

what kind of tone will that give me ? cheers for the reply

[Dezzy]

can the deep switch be changed to a bright switch ? or would that be a lot of work involved ?

[Dezzy]

I'd start with something like this. It should sound good for guitar, and be a little different than the other channel.

[ATTACH=CONFIG]16147[/ATTACH]

Will that give me a bright clean tone ? also what effect will the deep switch have on that, is the deep switch easy to change to a bright switch ? thanks for your time man-

[Jazz P Bass]

The deep switch is simply a switch.
If you look at the normal channel schematic, the bright switch simply connects a 120pf capacitor or it doesn't.
So, yes, the deep switch could be rewired to connect or disconnect a 120pf capacitor the same way.

[Dezzy]

The deep switch is simply a switch.
If you look at the normal channel schematic, the bright switch simply connects a 120pf capacitor or it doesn't.
So, yes, the deep switch could be rewired to connect or disconnect a 120pf capacitor the same way.

Thank's man

[Tom Phillips]

The Fender Bassman 100 schematic is strange.
The inputs are marked 1,2,3 & 4 instead of Normal 1 & 2 and Bass 1 & 2 as shown on the front panel.
Also the #1 is the attenuated input and #2 is the full signal input. (Backwards from the Fender convention) The amp itself seems to be conventional Fender but the person who drafted the schematic must have been a new guy.

[Dezzy]

The Fender Bassman 100 schematic is strange.
The inputs are marked 1,2,3 & 4 instead of Normal 1 & 2 and Bass 1 & 2 as shown on the front panel.
Also the #1 is the attenuated input and #2 is the full signal input. (Backwards from the Fender convention) The amp itself seems to be conventional Fender but the person who drafted the schematic must have been a new guy.

That is odd, because input 1 is louder than 2 on both the channels on my bassman 100

[Tom Phillips]

That is odd, because input 1 is louder than 2 on both the channels on my bassman 100

Yes. To clarify I was pointing out that the schematic is drawn wrong. I suspect that the inputs to both channels are wired the traditional Fender way.

Tom