Author Topic: bought a few 16 volt caps  (Read 2107 times)

sniper

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bought a few 16 volt caps
« on: January 27, 2010, 01:08:44 PM »
No, but without measuring it, my guess is that the busted cap still had near its proper capacitance value, because it still worked somewhat as a tone rolloff, but at a drastically reduced voltage capability, so that the massive pickup easily overloaded it. 

posted in another topic here.

i bought some smaller 16 volt caps to try and replace the 50 volt one to see if i can get a "Jack" tone out of my EBO. i'll let you know if it works as soon as they get here and if i can find my soldering iron. looks like the original value is .033 uF @ 50 volts.
I can be true to you sweety until I find a nice medium scale with great breasts. ... CW

Psycho Bass Guy

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Re: bought a few 16 volt caps
« Reply #1 on: January 27, 2010, 01:46:59 PM »
You will probably have to go lower in voltage than that, but the results of what you're trying should prove interesting.

BTW, where'd you find the 16 volt caps? I had to buy a bunch of low voltage stuff a few weeks ago, and EVERYBODY was out of nearly all of what I needed.

sniper

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Re: bought a few 16 volt caps
« Reply #2 on: January 27, 2010, 02:09:36 PM »
the bay, 1.99 for 10 of them.
I can be true to you sweety until I find a nice medium scale with great breasts. ... CW

Psycho Bass Guy

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Re: bought a few 16 volt caps
« Reply #3 on: January 27, 2010, 02:14:51 PM »
...figures. That's where I ended up getting mine, too.

sniper

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Re: bought a few 16 volt caps
« Reply #4 on: January 27, 2010, 02:21:41 PM »
just scored some 10 volt .033 caps for 1.29

i searched for 10 volt caps and found them. dunno if i can find any lower voltage values or not. here are some 15 uF's

http://cgi.ebay.com/15-mfd-10-volt-Tantalum-Cap-QTY-25-ea-S2_W0QQitemZ190363865848QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2c529212f8

i even found some 1.5 henry chokes at nebraska surplus: (CPW) MQA-13) their parts number ... http://www.surplussales.com/Transformers/PowerChk-3.html

about halfway down on the right side. let me know if you think they might work in an old EB3
« Last Edit: January 27, 2010, 02:31:24 PM by sniper dog »
I can be true to you sweety until I find a nice medium scale with great breasts. ... CW

Psycho Bass Guy

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Re: bought a few 16 volt caps
« Reply #5 on: January 27, 2010, 03:19:08 PM »
I've never messed enough with Gibson basses (I know that's near-heresy here) to even know that they used chokes.  I only knew that EB-0 had a bad cap because the tech at the store where it was had the plate off and showed me. He had planned on changing it, but I asked to play it first. They were selling it for $250 which was a steal even then (10-15 years ago).

I went to the ATM, but by the time I got back, it had already been sold... to George Gruhn, who had stopped by on his way back from a purchasing trip to Asheville. He knew the owners of the place, and they would always cherry-pick the best stuff for him and ocassionally give him a super deal like that EB-0 because he would come back and pay huge amounts of money for other stuff.

 At that same store, in rural East Tennessee, I have played a 50's Esquire and Nocaster, tons of 50's Tele's, and lots of weird basses and amps.  I got my first SVT there, along with my Traynor.  Us hill people horde stuff, but unfortunately, when a lot of the old players die, their families don't know what the instruments are worth and they sell them for nothing. The music store is also a pawn shop, so they get a LOT of traffic that a traditional music store, expecially one in this area,  would never see.  EBay has pretty much killed off most of that now, though.

Psycho Bass Guy

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Re: bought a few 16 volt caps
« Reply #6 on: January 27, 2010, 03:47:54 PM »
...never fooled with a varitone in a guitar either.  If you can find a schematic, post it, and I'll see if I can figure out what's going on with the choke.

Dave W

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Re: bought a few 16 volt caps
« Reply #7 on: January 27, 2010, 03:52:34 PM »
Sorry, screwed up my previous post.

http://www.gibson.com/Service/Tech/Schematics/

Look under the EB-2 and EB-3 circuits.

sniper

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Re: bought a few 16 volt caps
« Reply #8 on: January 27, 2010, 03:54:55 PM »


this is for the first bass series i believe. i'll try to find one for the second series. (i have it hidden right in front of me somewhere?)

here it is but it is one of the original Gibby schemo's from Jules site or Gibson i don't know? :



here is the second bass series:



« Last Edit: January 27, 2010, 04:16:01 PM by sniper dog »
I can be true to you sweety until I find a nice medium scale with great breasts. ... CW

Psycho Bass Guy

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Re: bought a few 16 volt caps
« Reply #9 on: January 27, 2010, 04:04:58 PM »
I looks like its being used as a big filter. If I'm reading it right, the choke setting on the switch is the "mostly mids." Is that right?

With 500K pots and a choke, those pickups have got to be insanely hot. Are there any published voltage output ratings for them or is it all just impedance?

BTW, I getting ready to do some recording, so if I disappear in the next few minutes, that's what's up.

sniper

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Re: bought a few 16 volt caps
« Reply #10 on: January 27, 2010, 04:26:01 PM »
the value of the second series choke is generally accepted as being 1.5 Henry. i do not know what the first series value is for the choke.

i do know the second series runs about 2.6 - 2.65 k Ohm DCR.
I can be true to you sweety until I find a nice medium scale with great breasts. ... CW

Psycho Bass Guy

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Re: bought a few 16 volt caps
« Reply #11 on: January 27, 2010, 04:31:25 PM »
Higher inductance should give a steeper filter corner on both the highs and lows, IOW, it will "do" more. Am I correct about the choke being the "midrange" position on the switch?

sniper

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Re: bought a few 16 volt caps
« Reply #12 on: January 27, 2010, 04:38:57 PM »
that i will have to research for some articles from chromium or some other guys here. i know they have been published here, but it has been too long since i had an EB3.

this thread is interesting reading:

http://bassoutpost.com/index.php?topic=1408.0
« Last Edit: January 27, 2010, 04:58:11 PM by sniper dog »
I can be true to you sweety until I find a nice medium scale with great breasts. ... CW

Psycho Bass Guy

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Re: bought a few 16 volt caps
« Reply #13 on: January 28, 2010, 02:03:06 AM »
this thread is interesting reading:

http://bassoutpost.com/index.php?topic=1408.0

It seems to agree with my assessment: the choke filters out the extreme lows and upper midrange. I'll bet they were trying to appease pissed-off recording engineers and amp makers mad because the huge current of the sub lows from those big honking pickups was printing through their tape and blowing speakers, and the choke is a P-Bass "emulator." Split-coil P-basses are mostly low mids, not actual bottom, but most people can't tell low mids from true lows, so it has a reputation for having more bottom than it actually does.

sniper

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Re: bought a few 16 volt caps
« Reply #14 on: January 28, 2010, 09:05:05 PM »
It seems to agree with my assessment: the choke filters out the extreme lows and upper midrange. I'll bet they were trying to appease pissed-off recording engineers and amp makers mad because the huge current of the sub lows from those big honking pickups was printing through their tape and blowing speakers, and the choke is a P-Bass "emulator." Split-coil P-basses are mostly low mids, not actual bottom, but most people can't tell low mids from true lows, so it has a reputation for having more bottom than it actually does.

that clears up a lot of questions i have had about speakers and EB's. i was worried about how a repopped EB3 might sound as i cannot afford a vintage one but was also concerned about how good my G12T-75's sound in that old Fender Blonde bottom and not wanting to change them out.

the varitone in a candy tin (elsewhere in this forum) seems like a great idea too but i am not knocking the HAS Sound varitone or the Big D varitone although i like the idea of NOT changing or hollowing out more wood than is absolutely needed in a build and it gives me more focus on my projects ... as i set here with a NOS Schumacher 160-240 watt OPT under my desk! what next ... forgive me Lord as i have truely flipped out on projects!!!

thanks
I can be true to you sweety until I find a nice medium scale with great breasts. ... CW