Recent acquisition

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Recent acquisition

Postby Rex Everything on Fri Aug 15, 2014 2:25 am

Here is a cool one to check out and something I know Papa Dog is gonna want to see.

A 1976(?) Sound City X188 head. This one needs the can caps replaced and prolly a bit more attention but overall is in very clean shape;

Whatcha'll think....

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Oh, I also picked up an L100 Mark 3 a bit ago. Do you all have any info on it?
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Re: Recent acquisition

Postby Papa Dog on Fri Aug 15, 2014 5:36 am

LB100 Mk3
Image

Please do send along those pics of the X188
Wish I had schematics.
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Re: Recent acquisition

Postby Rex Everything on Fri Aug 15, 2014 6:30 am

The X188 pics are the ones above. Do you mean you want them in email?

I sure wish you or someone had a schematic as well but this on looks pretty clean inside aside from the spewing and bulging can caps
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Re: Recent acquisition

Postby Papa Dog on Fri Aug 15, 2014 6:47 am

Rex Everything wrote:The X188 pics are the ones above. Do you mean you want them in email?

I sure wish you or someone had a schematic as well but this on looks pretty clean inside aside from the spewing and bulging can caps

Yes, please. mail them to admin@soundcitysite.com
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Of cabbages--and kings--"
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Re: Recent acquisition

Postby pdf64 on Fri Aug 15, 2014 7:22 am

Thanks for sharing!
What is the big computer type cap doing?
Is it too tall to mount vertically, so it had to go inside?
And the little pcb mounted on its terminals?
Pete
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Re: Recent acquisition

Postby Papa Dog on Fri Aug 15, 2014 5:22 pm

pdf64 wrote:Thanks for sharing!
What is the big computer type cap doing?
Is it too tall to mount vertically, so it had to go inside?
And the little pcb mounted on its terminals?
Pete


while the 120+ had some caps mounted verticly, the 200+ had six big cans mounted on the chassis ends.
Not a bad arrangement. So I would reckon that the later built X188 was following suite.
the only reason I can see for mounting cap above board is to shorten the runs from them.

Thing isrun has to be made somewhere...I like the arrangement of having the caps mounted under the chassis and closer to the PT...and maybe have some filters above board right next to the point that they feed into.
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Re: Recent acquisition

Postby Papa Dog on Fri Aug 15, 2014 7:19 pm

the chassis for theX188 looks like the Mk4 120+ chassis...most likely is the same
the big cap and small pcb are (most likely) the first filter for the 1st tube, AKA the pre-amp or 1st gain stage.
Mk3 200+ had a 200 mfd/350v cap there where the 120+ had a 32mfd/350v cap.
bigger cap should mean quieter 1st stage....
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Re: Recent acquisition

Postby Rex Everything on Fri Aug 15, 2014 11:43 pm

From what I can see the big cap underneath looks to be attached to the boost switch/circuit. t this point I'm assuming it has something to do with it.
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Re: Recent acquisition

Postby Papa Dog on Sat Aug 16, 2014 4:21 am

Rex Everything wrote:From what I can see the big cap underneath looks to be attached to the boost switch/circuit. t this point I'm assuming it has something to do with it.

Rex, I think you are right.
Wish I cuold read the lables on the front. Either my screen is not good enough or a closer shot would help.
Now I gotta see if i can find a schematic somewhere.
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Re: Recent acquisition

Postby Rex Everything on Sat Aug 16, 2014 6:15 pm

Sorry about the crappy picture Papa Dog....I was wondering why they were so bad then discovered my seven year old had touched the lens at some point when using the camera.

Controls left to right are as follows

inputs high/low, boost switch, volume, harmonic volume, (equalizer) 30Hz/300Hz/3KHz, stand by, on/off

Hope that helps. I'll work on some better pics of the front soon
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Re: Recent acquisition

Postby Papa Dog on Sun Aug 17, 2014 12:35 am

Rex Everything wrote:Sorry about the crappy picture Papa Dog....I was wondering why they were so bad then discovered my seven year old had touched the lens at some point when using the camera.

Controls left to right are as follows

inputs high/low, boost switch, volume, harmonic volume, (equalizer) 30Hz/300Hz/3KHz, stand by, on/off

Hope that helps. I'll work on some better pics of the front soon


they do not look bad...I just could not get the lettering to focus.
the information which you provided helps a great deal
I have looked and cannot find a schematic anywhere...but the information tells more than you might think.
There seem to have not been many of that model made and speculation is that it was a limited run (one of a few types) as trial models to see which way to move.

the harmonic volume sounds as if it would be the same as the overtone control on some earlier amps.
I would suppose that the equalizer is the same as the earlier "active tone control and now we have an idea of where to look for the crossover or center freqs.
There Ain't No Such Thing As A Free Lunch.

"The time has come," the Walrus said,
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Of shoes--and ships--and sealing-wax--
Of cabbages--and kings--"
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Re: Recent acquisition

Postby Papa Dog on Sun Aug 17, 2014 12:42 am

ok...upon review, it aint the active circuit...much simpler, not like a Mk3 either.
but at least we know what the crossover/center freqs are supposed to be.
those determine more how the amp sounds than many other things.
There Ain't No Such Thing As A Free Lunch.

"The time has come," the Walrus said,
"To talk of many things:
Of shoes--and ships--and sealing-wax--
Of cabbages--and kings--"
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Re: Recent acquisition

Postby Rex Everything on Mon Sep 15, 2014 10:48 pm

Sorry I've not been back in a bit. I moved and have just gotten kinda stable.

Power supply caps are on order for this amp. Once installed more info will come.
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