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

Previous 20 Messages  


Jun 9th, 2004 05:48 PM   Edit   Profile   Print Topic   Search Topic

I know. :) I don't use that pedal any more as a distortion, as I hate the sound. I only use it for EQ on it, which is good. It is from my past sinful life when I used to play heavey metal. :) For that it was very good. Now I am an convert and play only blues and jazz.

I use a Tube Screamer now (another solid state :) ).



Jun 9th, 2004 05:51 PM   Edit   Profile   Print Topic   Search Topic

BTW, I am trying to finish the Bias mod, and I can't locate 5K resistor. Can I use 4.7K resistor in place or do I really need 5K?


N. Kentucky, USA

Human Power Resistor
Jun 9th, 2004 05:54 PM   Edit   Profile   Print Topic   Search Topic

4.7K should be fine, although a 5.1K is a little closer. Probably won't make too much of a difference either way.

Contributing Member

New Jersey, USA

Hey! What exit?
Jun 9th, 2004 09:30 PM   Edit   Profile   Print Topic   Search Topic

Either value is fine. It's just a bounding resistor so you can't crank the bias all the way to zero, but keeps the overall resistance from the top to the bottom of the voltage divider pretty close to stock.


acetylsalicylic aci

Jun 9th, 2004 10:12 PM   Edit   Profile   Print Topic   Search Topic

Two points:
* What Still said: waiting awhile before you declare that you "hate" the mod is a sound idea.
* And since it's a mod that comes with a name attached to it, you might find a less brutal way to describe your reaction.

Contributing Member


Nothing is true Everything is permitted
Jun 10th, 2004 08:42 AM   Edit   Profile   Print Topic   Search Topic

One additional point:
* Give your registration to the FDP a few weeks to mature before you go off and slam someone or something.

Contributing Member

New Jersey, USA

Hey! What exit?
Jun 10th, 2004 12:02 PM   Edit   Profile   Print Topic   Search Topic

As Billy Gibbons once said, "De gustibus non est disputandum."

No, wait, maybe it was Jimi Hendrix? Or maybe Immanuel Kant... I get them all confused sometimes. But the point is that there's no disputing taste, and if wonsup hates the sound of the mod, it's his choice to say so. Is "horrible" too strong a term? I hope so. But we're talking music and tone here, so let the opinions pour forth.



Jun 10th, 2004 12:54 PM   Edit   Profile   Print Topic   Search Topic

Gee guys,

I didn't mean to come across as slamming anyone. Obvioulsy BillM has been very helpful on this thread. I appreciate that. And I appreciate his website, and I am middle of doing the bias mod to the amp.

However, can I not say I hate Fender Strat sound, becasue it it tied to a name Leo Fender? That sounds absurd. I heard that countless times from others.

If someone can say "I love BillM mod" then I have right so say "I hate BillM mod", if someone says "It sounds wonderful" I have right to say "It sounds horrible." Love, hate, wonderful, horrible are all STRONG words, just the oppsoite spectrum.

I didn't mean to attack BillM personally, however, I do not agree with everyone saying how wonderful his mods makes their amp sound. In my case, I thought it made it sound worse (just the mid cap, really).

Again, as BillM said above, taste is very subjectional.



Jun 10th, 2004 01:00 PM   Edit   Profile   Print Topic   Search Topic


Dispite the title of this topic, I have found the discussion to be very interesting. And I am now convinced that I want to perform the tone stack and reverb mods to my tweed/green board Blues Jr.

I do have one question. On the high end, I like the slightly darker sound of my tweed Blues Jr. Will the tone stack and reverb mods make the amp brighter? I would like to simply add a little more to the bass end while leaving the treble alone (and of course fix the reverb issues).

And as far as the "two knobber" is concerned, that is the way I have been using my Blues Jr. for a long time. The bass and mid always stay in the same spot, and I use the treble as a tone knob. It works very well.

Thanks for all of your terrific work on this little monster.



Little Deuce Coupe
Jun 10th, 2004 01:53 PM   Edit   Profile   Print Topic   Search Topic


Kant would have said it in German not Latin, so hendrix? I have been surprised by some of the shall we say "strong" opinions musicians voice.

I think we are inherently emotional, passionate people..so let the juices flow so long as we don't attack people personally..I've become used to one man saying this is the greatest thing since sliced bread, next guy saying "what a piece of SH*t, it sucks. Once I became used to that it is as you said or the variant "One man's meat is another man's poison."



Jun 10th, 2004 02:30 PM   Edit   Profile   Print Topic   Search Topic

Well, I've replaced the mid cap back to the stock (kept the bass cap) and voila! It sounds great!

My complaint about the Blues jr was that it has flabby bass. I even tried it with external 2x12 enclosed cab, and the bass didn't really improve much. I thought about changing the speaker to Weber Bluedog, since everyone recommended that it will make the bass more defined, but reading BillM's description of how you don't need to waste money doing that convinced me that I should spend money somewhere else.

And yes, chaning the bass cap really brought up the clear, defined bass notes. This was what I was looking for.

However, I don't think I like the mid cap change. No matter what I did with the dial, there was this frequency presence that really bothered me. Even my wife, who is not a very musical person, said that it sounded bad.

What I would like to see in the mid cap is to lessen the mid scoop (like the original intention), but keep the center frequency exactly the same as the stock one, rather than lowering it. I think that is where it would sounds the best for me. However, I don't want the mid scoop the be lessened so much that the frequency response is flat, and it gives that sterile, Hi-Fi sound.

Mid cap change does allow you to control the mid frequency more. You don't have to turn the knob as much to hear mid frequency getting louder/quieter.

What cap should I try on the mid cap, if I want the same frequency center, but more (control) of it?

So far, I apprecaite everyone's feedback (even the tongue lashing! :)). It's been very valuable.

Contributing Member

San Francisco, CA

Jun 10th, 2004 03:21 PM   Edit   Profile   Print Topic   Search Topic

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   Print Topic   Search Topic

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   Print Topic   Search Topic

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   Print Topic   Search Topic

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   Print Topic   Search Topic

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   Print Topic   Search Topic

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   Print Topic   Search Topic

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   Print Topic   Search Topic

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   Print Topic   Search Topic

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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