Teach me about the electronics in Phil's EB3

Re: Teach me about the electronics in Phil's EB3

Postby Rusty the Scoob » Wed Mar 03, 2010 11:07 am

SarnoMusicSolutions wrote:I talked to Ron Wickersham about this because we modded a friends EB3 with the Hammon Dark Star pickup. We never did the active electronics, but I did learn a bit about it from him. The buffers were definitely NOT like the Blaster. The Blaster, technically speaking, really isn't a buffer. It's more of a booster, preamp since it's set up as a gain stage with a high-z output.

A true buffer suggest that it's unity gain and has a low Z output. On Phil's bass, Ron had hooked up each pickup with its own buffer. He used a (now ancient and archaic) RCA transistor device that internally was set up as a "Darlington Pair". This made it a great buffer, with gobs of ability to drive all kinds of cable length and "crap" without suffering tone loss. But those old devices are noisy and unstable compared to more modern parts. If you want a much higher performance transistor to do this identical job, look for the more modern and readily available MPS-A18 transistor. This is a very high gain, low-noise, Darlington pair type transistor. When used as an "emitter follower" buffer, all that gain translates into unity gain with all kinds of current drive ability. Just look up "emitter followers" and it should be cake to accomplish. All you'll need is a couple of cap's, the MPS-A18, and a resistor and 9 volts. That's per pickup.

As far as tone controls and filtering, I can't help you there, but maybe Fred Hammon could.

Brad



I'm back on this project and am very slowly coming to understand what you're telling me. I read up on Darlington Pairs and I think I get it, but please correct me if any of this is wrong. It's two transistors used as amplifiers where one amplifies the signal and the second amplifies the output of the first one even further. The MPS-A18 is a single unit that accomplishes both tasks.

Emitter Followers are still over my head... I haven't found an article yet that breaks it down to my level or better yet some directions that say "buy these parts and solder them together this way"... but at least I'm making progress.


What I need to know right now is: I'm finally at the stage of ordering the Dark Star pickups. Fred mentions on his FAQ page to look for Low Impedance models in the future: http://www.hammoneng.com/faq1.htm Should I ask him if he'll make me a prototype set (he hand-winds all his pickups so it should be easy, I think) or just get his regular high-impedance pickups?
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Re: Teach me about the electronics in Phil's EB3

Postby SarnoMusicSolutions » Wed Mar 03, 2010 1:53 pm

Regular Hi-Z version!!!

Brad
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Re: Teach me about the electronics in Phil's EB3

Postby Rusty the Scoob » Wed Mar 03, 2010 2:36 pm

Thanks, Brad! Phew! I get to take the safe route on something. :lol:
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Re: Teach me about the electronics in Phil's EB3

Postby mgod » Thu Sep 16, 2010 9:21 am

Just a couple thoughts about this:

There are a few really critical aspects of getting that tone, but the onboard emitter followers (the Darlington circuit) aren't among them. The scale length and pickups and body materials will matter, the autoformers of a Mac amp and the choice of string will be big, but as important as ALL that stuff will be your hands, maybe a bigger part of it than anything else. If you play the bass right, you can probably get closer to that sound with a P and flats than worrying about whether you've dropped the Z between the pickups and the output jack. You could play Phil's EB through his rig at the time, and if you're hands aren't right, you'll still sound like you and not him.
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Re: Teach me about the electronics in Phil's EB3

Postby mgod » Thu Sep 16, 2010 9:39 am

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Re: Teach me about the electronics in Phil's EB3

Postby mgod » Thu Sep 16, 2010 9:41 am

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Re: Teach me about the electronics in Phil's EB3

Postby jeffm725 » Thu Sep 16, 2010 9:43 am

mgod.....Awesome bass!!
.......................................................have you heard the one about the yellow dog?
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Re: Teach me about the electronics in Phil's EB3

Postby waldo041 » Thu Sep 16, 2010 9:44 am

mgod wrote:but as important as ALL that stuff will be your hands, maybe a bigger part of it than anything else. If you play the bass right, you can probably get closer to that sound with a P and flats than worrying about whether you've dropped the Z between the pickups and the output jack. You could play Phil's EB through his rig at the time, and if you're hands aren't right, you'll still sound like you and not him.



WOW, insightful! do you think the same holds true for getting the jerry rig sound or weir rig?

peace,
waldo
"Tone is in the instruments. Technique in the hands. Do what you will." ~ quote from some guy at the TGP forum
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Re: Teach me about the electronics in Phil's EB3

Postby mgod » Thu Sep 16, 2010 9:49 am

I guess that depends on how good you are, or how good you're willing to be - and that all depends on your attitude, doesn't it?

Peace indeed.
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Re: Teach me about the electronics in Phil's EB3

Postby RiverRat » Thu Sep 16, 2010 9:53 am

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Re: Teach me about the electronics in Phil's EB3

Postby waldo041 » Thu Sep 16, 2010 9:59 am

sorry, the legal team keeps me from truly disclosing the info but i can give you a hint for the jerry hand mods.

Image

what you do with the info is strictly at your own risk! :lol:

peace,
waldo
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Re: Teach me about the electronics in Phil's EB3

Postby mgod » Thu Sep 16, 2010 10:02 am

The point is - nobody reading this forum has to buy anything from anybody else posting here, all they have to do if focus on their actual musicianship, like the original guys did. I realize that works out better for some than for others.
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Re: Teach me about the electronics in Phil's EB3

Postby RiverRat » Thu Sep 16, 2010 10:05 am

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Re: Teach me about the electronics in Phil's EB3

Postby RiverRat » Thu Sep 16, 2010 10:08 am

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Re: Teach me about the electronics in Phil's EB3

Postby mgod » Thu Sep 16, 2010 10:22 am

RiverRat wrote:No amount of musicianship will allow you to sound like Jerry playing a Kramer Barretta through a solid state Crate amp!!!

Jerry would have.
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