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FDP Forum / Fender Amps: 1985 - Current / I hate BillM mod (It sounds horrible!)

Previous 20 Messages  
Contributing Member

San Francisco, CA

Jun 10th, 2004 03:21 PM   Edit   Profile  

Ah, what a little set of quotation marks can do for something like a thread title.

I thought you were going to tell us about your new "I hate Billm" mod. Took me a second to realize you hate the "Billm mod"




Jun 11th, 2004 05:02 PM   Edit   Profile  

I just love BillM's new tape (((echo)))

We can only WISH WISh WIsh Wish wish.....


united states

Jun 11th, 2004 11:38 PM   Edit   Profile  

Is there any chance the cap used on the mids was bunk to begin with?


Promise Land

I'm drinking from the saucer
Jun 12th, 2004 12:52 PM   Edit   Profile  

There you go Billm, a new project for you to work on, in your spare time. Another knob on the BJr that will adjust the center of the mid frequency. You know, like the mid sweep on my PA system. :)

Blessings, Terry

Contributing Member

New Jersey, USA

Hey! What exit?
Jun 12th, 2004 01:17 PM   Edit   Profile  

Don't think I haven't thought about it, Terry! One of the things I could do with that extra triode is build an active, sweepable notch filter or boost. But it's a lot of circuitry for a limited benefit.


Promise Land

I'm drinking from the saucer
Jun 12th, 2004 04:17 PM   Edit   Profile  

You know we could do a two or even three way switch with different caps for the mids. Similar to your bright switch setup I would think. Wonsup's got me thinking now. That could be dangerous. :)

Blessings, Terry

Tele Vince

United States

Dec 5th, 2016 12:19 PM   Edit   Profile  

Has anyone experimented with changing the mid tone cap at all?

I’ve changed my bass cap from 0.022uF to 0.1uF. Happy with that change.

However, I also changed the mid cap from 0.022uF to 0.015uF, per BillM’s specs. Now, I find the mids to be muddy (too many 150-400Hz, not enough 700-1,000Hz).

Would it make sense to put the 0.022uF mid cap back in? Or maybe go all the way up to the 0.047uF that many Fender amp’s use? I'm worried 0.022uF wouldn't change it much, and I'm worried 0.047uF would not allow mids to be turned up enough.


Contributing Member

Don't stumble over

something behind you
Dec 5th, 2016 07:29 PM   Edit   Profile  

Wow! 12 years old and resurrected. BillM is still kickin' :o) (rest in peace, brother)

Tone is so dang subjective that there's no "correct" configuration, because speakers are different, guitars are different, and ears are different.

Try several different cap values: Make a little switch box from spare/scrap parts so you can select different caps on the fly, and your ears will tell you what's best.

Tele Vince

United States

Dec 9th, 2016 08:52 AM   Edit   Profile  

Since I already had the part, I tried just putting a 0.022 mid cap back in. Seems to have removed the muddiness. (Yay!) I do understand though why BillM recommends the 0.015. That definitely sounded fuller when clean. So, it's a trade-off: that increased fullness will also bring more mud. Since I play more overdriven than clean songs, the less muddiness was a larger priority. (If I was playing mostly cleans, I'd probably leave the 0.015 cap in.)

Either way, increasing the bass cap was still the way to go. I'm happy with the 0.1 I have in now, but I bet a 0.047 could be a good choice compared to the stock 0.022 too.

Previous 20 Messages  

FDP Forum / Fender Amps: 1985 - Current / I hate BillM mod (It sounds horrible!)

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