SC 200+ makeover

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Re: SC 200+ makeover

Postby Vucinic on Fri Jun 30, 2017 5:00 am

I ended up yesterday about 3 in the morning and I didn't take pictures. I will and i will draw schematics.
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Re: SC 200+ makeover

Postby Vucinic on Fri Jun 30, 2017 3:33 pm

Hi john,
I drew schematics but i cant upload. Quota is full
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Re: SC 200+ makeover

Postby Papa Dog on Fri Jun 30, 2017 6:26 pm

ya gotta put it somewhere like PhotoBucket and then link to it.
I have been here for years and it has never (so far as I know) been possible to upload pics or files here.
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 Fri Jun 30, 2017 7:09 pm

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Re: SC 200+ makeover

Postby Vucinic on Mon Jul 03, 2017 5:03 pm

Hi John, do you check my schematic?
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Re: SC 200+ makeover

Postby Papa Dog on Tue Jul 04, 2017 12:24 am

Vucinic wrote:Hi John, do you check my schematic?

yes, yes I did.
I wanted to take another look. Some things do not look quite "right" to me.
V3 left side has no plate resistor at all.
v3 right side has both 100k plate and 100K cathode. for a cathode follower, it should only be the cathode. Otherwise, it acts as a concertina phase inverter.
and you have an unused tube half...I can think of several uses for that.
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 Tue Jul 04, 2017 9:18 am

You're right, I'm sorry, the 100K resistor should be on V3 pin 1, not on V3 pin 6. Thanks.
I corrected it on the schematics, аnd I increased the resolution of the image to make it clearer for viewing.

new link is: http://i349.photobucket.com/albums/q376 ... aqie2c.jpg

The first half of the V2 is an additional gain stage. If you have any suggestion for the second half, I would be happy to try it.
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Re: SC 200+ makeover

Postby Vucinic on Thu Jul 06, 2017 11:15 pm

Some sound, recorded with phone.
https://youtu.be/iZ4BtxK8RdQ
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Re: SC 200+ makeover

Postby Vucinic on Wed Jul 12, 2017 11:25 pm

Hi to all,

No comments, suggestions, crucifixion?
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Re: SC 200+ makeover

Postby Papa Dog on Wed Jul 12, 2017 11:38 pm

Vucinic wrote:Hi to all,

No comments, suggestions, crucifixion?


Nope
There were some minimal mods you could have done to get what you said you wanted."
You chose to do something different.
Your amp, your choice, a real pity, IMHO
Hope it works out for you as you are hoping.
Whatever else it is, it WILL be loud.
Hope you at least had the sense to replace the turret boards instead of stripping them.
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--"
Papa Dog
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Posts: 1337
Joined: Mon Mar 15, 2010 6:48 pm
Location: Narly Ampwerks

Re: SC 200+ makeover

Postby Vucinic on Thu Jul 13, 2017 5:02 am

Now I have what I need, i'm satisfied and I rock.

One year i was trying to not changing the amp, 4 months I tried to sell it, nobady was interested for buying. I reeded all posts you can find for SC 200+ and schematics. From great SoundCity to SoundS...y (i do not agree). All about CUSTOM MADE.

So i follow me needs and i do not regret.

For the turret board, no i pre-wired preamp turret board, but i have detailed pics for reverting if you ask that. Any way there are onli resistors and caps ( everybody says that caps must be replaced) so i can see the difference.

Anyway,
PapaDog, thank you for all your replays, help and support for years. You are only one who can teach how to love and see the beauty of Sound City amps. Thay are Great.

Best Regards
Vucinic
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