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Old 29th April 2012, 10:10 PM   #1
pancaQe is offline pancaQe  United States
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Default Soundcraftsmen 5050

Hello,
I came across an old Soundcraftsmen 5050 integrated tube amp that I want to rebuild. Problem being that I cannot find a schematic or for that matter hardly any reference to this piece online. If anyone has a lead on where I might find info on it that would be appreciated.

thanks, Mark
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Old 29th April 2012, 10:59 PM   #2
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What's the tube complement? That info. will tell us the capability of the unit's magnetics. Plenty of good circuit ideas will follow.

BTW, upload some photos, if possible.
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Old 29th April 2012, 11:29 PM   #3
pancaQe is offline pancaQe  United States
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Hi Eli, thanks for responding. The tube compliment is as follows.
** 2 - NOS Mullard ECC83 Pre Amp
** 2 - NOS GE 7247 AF Amp Phase Inv.
** 4 - NOS Telefunken EL86 Power
** 1 - JJ GZ34S Rectifier
** 1 - NOS Telefunken EMM801 Indicator
I will provide photos when I can get my hands on a digi camera

thanks
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Old 30th April 2012, 12:02 AM   #4
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This is a super rare item, and fairly valuable - the best advice I can give you is to do as little as possible as necessary in order to get it up and running. (It should sound pretty good in proper working order.)

Usual candidates would include replacing electrolytics, and coupling caps if necessary.

Please post pictures.
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Old 30th April 2012, 12:37 AM   #5
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Get the JJ rectifier out of there, PRONTO! JJ has become notorious for quality control problems. The "zinger" making the rounds is Jamona Junk. Install a Sovtek 5AR4 and a pair of UF4007s to provide some PIV headroom.

I'm guessing the ECC83/12AX7s are in a phono section. The 7247/12DW7 is 1/2 a 'X7 and 1/2 a 'U7. A reasonable arrangement for that type is high μ section as a voltage amplifier and the low μ section as a "concertina" phase splitter that's DC coupled to the voltage amplifier. Look at the Dyna ST35.

I can't begin to guess why an indicator tube is part of an integrated amp.

Does the unit have tone controls?
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Old 30th April 2012, 07:34 PM   #6
pancaQe is offline pancaQe  United States
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@ Kevinkr, Would it's rarity explain the lack of info online? My goal is to get it back to it's original operating parameters. Unfortunately the filter caps have already been removed along with a couple other components which appear to be capacitors. So a schematic would be perfect, but I can't find one. I also got the matching Soundcraftsmen Simulcast 9520 MX reciever component. It's tube compliment is as follows.
** 1 - GE 6EB6
** 2 - " 6AU6
** 2 - " 6BZ6
** 1 - " 12AV7
** 1 - " Z2969
** 1 - Telefunken EAM-86

@Eli, The 12AX7s are for pre-amp cause it has an NPN transistor phono section.
The indicator tube is for the "Stere-auditor Output Balance Meters" on the face plate. It has tone controls, Right Bass and Treble and Left Bass and Treble along with a Presence Compensator control.

thanks
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Old 30th April 2012, 07:42 PM   #7
pancaQe is offline pancaQe  United States
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@Eli, I didn't know JJ has QC problem, I thought they were one of the better tube manufacturers out there. Is it all their tubes or just rectifiers? I have an old GE I'll use once the 5050 is up and running. Thanks for the heads up.
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Old 30th April 2012, 07:42 PM   #8
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Pictures!
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Old 30th April 2012, 07:53 PM   #9
pancaQe is offline pancaQe  United States
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@cyclecamper,
Ok, I'll dig up my digi camera and post some pictures. Sorry for the delay
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Old 30th April 2012, 09:10 PM   #10
pancaQe is offline pancaQe  United States
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Default photos Soundcraftsmen 5050

Here's a few pix, sorry for the poor quality. I think my camera is as old as the amp.
Attached Images
File Type: jpg 5050 face.jpg (632.5 KB, 173 views)
File Type: jpg 5050 top.jpg (731.4 KB, 146 views)
File Type: jpg 5050 bottom.jpg (858.7 KB, 142 views)
File Type: jpg 5050 bottom 2.jpg (548.4 KB, 136 views)
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