SC 200+ makeover

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SC 200+ makeover

Postby Vucinic on Wed Jun 21, 2017 10:01 am

Hi to all.

What do you think about makeover preamp stage of Sound City 200 plus MKIV '74.

My ideas are:
1. HiWatt DR Lead '80
2. Marshall Major
3. Marshall JCM 800

thanks

Vucinic
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Re: SC 200+ makeover

Postby Papa Dog on Wed Jun 21, 2017 3:58 pm

or you could build any of those (except the major) from a kit and sell the 200+ to someone who wants to restore it. Or you could restore it yourself and either use it or sell it...you might find that you actually like it as it is supposed to be. Or not.
There Ain't No Such Thing As A Free Lunch.

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Of shoes--and ships--and sealing-wax--
Of cabbages--and kings--"
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Re: SC 200+ makeover

Postby Vucinic on Thu Jun 22, 2017 8:02 am

Hi John,
Has always been and will be that Europeans want American things, and Americans want European things (especially English ones). I really tried to sell it, but the shipping to America is too expensive, so selling 35kg head do not make any sense. I need a Amp to play.
I agree that its one of the best Clean Amps ever. It's so Clean and a lot of headroom even at full Volume and I never experienced crystal clean sound at over 200W output.
Unfortunately, that's not what I'm seeking. I tried with 30 types of pedals, but MK IV active tube preamp, making to hard to achieve good pedal-amp combination. If you just turn only 0.1 of Tone controls BMT you have huge difference.
Also I'm not going to keep it in the garage to collect dust. So I decided to modify it to my needs.

Sorry to all Vintage amps funs, but I'm going to Rock. I think that's the most important thing after all.......to Rock :jam:

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Re: SC 200+ makeover

Postby Papa Dog on Thu Jun 22, 2017 1:39 pm

I did not know that you had been trying to sell it. How much were/are you asking?
Yeah, shipping can get expensive, but sometimes that is just the price one pays.
Of course, it IS your amp to do with as you please.
And there are some lil tricks to get more "crunch" out of the front end.
With two channels you can set it up to have one crunchy and one super clean.
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: SC 200+ makeover

Postby Vucinic on Fri Jun 23, 2017 9:43 am

Estimated shipping from Macedonia, EU to Chicago is 2500$. how much will be the amp? also I change the old mixed up power tubes with new JJ KT88 platinum matched.

Thanks for your replay. Your opinion is matter to me and I really respect what you doing for this great amps.
I figured out that first think I must do is to change active tone circuit to passive. That will exclude one or to preamp tube, because tone circuit use 1 and 1/2 ECC83 tubes.
PI and power stage, stays untouched.
Than I will try to mode two first tubes to get overdrive and of course install Master Volume.

I'm not the expert and I don't know experts in Macedonia, but I learn a lot for this matter in a pass few months, so I going to do myself.

Because that, I asked, if anyone tried, which preamp circuit is suitable for SC200+.

Thanks again and I promise, everything going ti be easy to restore.
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Re: SC 200+ makeover

Postby LD50 on Fri Jun 23, 2017 3:31 pm

How much?? Did you add a nought on the end?

UK to US is £ 100 to 250 depending on valuation and speed needed!
All bleeding stops.......eventually.
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Re: SC 200+ makeover

Postby Papa Dog on Fri Jun 23, 2017 4:46 pm

easy enough to make the pre-amp "crunch"
1st change grid leak from 220k to 1M or 1.5M
maybe add a 68k grid stopper.
if that is not enough (should be) you can change the 2k2 cathode resistor to a 1k5 or 1k2.
Of course, that will change the operating conditions of the tube.
either or both and you have a very loud, very articulate crunch monster.
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: SC 200+ makeover

Postby Mr. Foxen on Fri Jun 23, 2017 5:21 pm

If you are desperate to destroy an amp, I have 200 PA I can trade, same iron, way less of a shame to carve up.
New music: https://warriorpope.bandcamp.com/album/anchorite
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Re: SC 200+ makeover

Postby Papa Dog on Sat Jun 24, 2017 4:11 am

now THAT sounds like a viable answer
There Ain't No Such Thing As A Free Lunch.

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"To talk of many things:
Of shoes--and ships--and sealing-wax--
Of cabbages--and kings--"
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Re: SC 200+ makeover

Postby Vucinic on Sat Jun 24, 2017 5:51 am

Last time i offered at reverb.com for 800 euro. No one even write to ask for a different price.

Nevermind, I already decided. This SC200+ is in my family over 30 years, so i decided to keep it and "destroy it".

Thanks John again for your support and tips. I keep you informed.
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Re: SC 200+ makeover

Postby Gooner01 on Sun Jun 25, 2017 1:48 pm

Vucinic wrote:Last time i offered at reverb.com for 800 euro. No one even write to ask for a different price.

Nevermind, I already decided. This SC200+ is in my family over 30 years, so i decided to keep it and "destroy it".

Thanks John again for your support and tips. I keep you informed.
Why not take up Foxen's offer, at least he will refurbish it, not destroy it!
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Re: SC 200+ makeover

Postby jaywalker on Mon Jun 26, 2017 2:17 am

Two amps passing in the night, strangers in the night exchanging glances as they journey, one from U.K. the other from Macedonia rushing toward a new life in a distant land...shipping cost be damned! :jam:
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Re: SC 200+ makeover

Postby Vucinic on Mon Jun 26, 2017 9:32 am

Exactly Jaywalker. Thanks
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Re: SC 200+ makeover

Postby Vucinic on Fri Jun 30, 2017 12:33 am

Finally I succeeded to "destroy" my SC200+.
Now i have:
1. Clean channel, which have plexi sound whit preamp at full volume.
2. Overdrive channel, with combination of preamp and MV.
3. At 10kohm cathode resistor i put Robinette's switcher at 4k7, 10k, 22k and soldano 39k options.
4. On the third coupling cap i added FAC rotary switch.
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Re: SC 200+ makeover

Postby Papa Dog on Fri Jun 30, 2017 1:40 am

got schematics or pics?
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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