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 Forum index » Instruments and Equipment » General Discussion
Another Mysterious tube thing: amp, Supro-Electro 1247
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debterminer



Joined: Feb 11, 2014
Posts: 41
Location: washington, US
Audio files: 9

PostPosted: Mon Aug 10, 2015 2:10 pm    Post subject: Another Mysterious tube thing: amp, Supro-Electro 1247
Subject description: Supro 1247
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It consists of:
2x radiotron 42's
One 4 pin sylvania mystery tube
with "Sylvania c6" written on it
(i suspect it is a rectifier)
1 Sylvania 6N7G
Amp is called "Supro electric #1247"
and two transformers, one for input(I assume) and another for electricity.
Additionaly it came in a cab which has a transformer
(The output transformer i presume) built onto the speaker.

Some pictures:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.
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debterminer



Joined: Feb 11, 2014
Posts: 41
Location: washington, US
Audio files: 9

PostPosted: Mon Aug 10, 2015 2:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

From some further research, i've been able to determine that this amplifier is from 1936
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BobTheDog



Joined: Feb 28, 2005
Posts: 4044
Location: England
Audio files: 32
G2 patch files: 15

PostPosted: Fri Aug 14, 2015 11:36 am    Post subject: Reply with quote  Mark this post and the followings unread

Does it work? Sounds like?
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debterminer



Joined: Feb 11, 2014
Posts: 41
Location: washington, US
Audio files: 9

PostPosted: Fri Aug 14, 2015 6:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

Im not turning it on until i've finished moving my electronics lab to my new house where i can properly work on it, It appears to ahve all original components(possibly even the tubes) So im not so sure about just turning it on until i know how to test each component in it for a failure that would normally show up as an firey paper capacitor lol. Also dont yet have a proper schematic for it, though i may have one that is roughly identical. Talking to a guy whos an expert on valco/supro amps about it, as i want to get it running, not blow it up XD.
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Airlock



Joined: Apr 06, 2007
Posts: 309
Location: Calabash, NC USA
Audio files: 53

PostPosted: Sat Aug 22, 2015 3:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

Do a trace off the power supply: old amps can have iffy design choices that can kill, as can be seen in the attached:


Silvertone.png
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