Stromberg-Carlson project

majorarmspeed · 29th March 2005, 07:32 AM

I just picked up a Stromberg-Carlson Model 20 PA amp for conversion into a guitar amp. It' sfrom the forties; two huge white chickenhead knobs on the front. Where do I start? WHo has schematics? Will human sacrifice be necessary to get it running? Thanks.

Giaime · 29th March 2005, 07:43 AM

Wow! Great! You could avoid remounting in a separate enclosure... that looks so cool!

The first thing in pa-guitar amp job is to check if the pa works as it was intended to work. First repair the pa then convert it to guitar amp. Sorry, no schematics. Could you tell us what tubes are inside?

Tekko · 29th March 2005, 08:26 AM

pics PICS

Take some pics of the inside.

audiobot · 29th March 2005, 11:14 AM

My experience with Strombergs of this era is that the schematic is pasted on the inside of the bottom cover. Have you opened it up?

Michael

Giaime · 29th March 2005, 12:54 PM

I think that the guy hasn't recived yet the amp in question... just look at the ebay logo under the picture...

richwalters · 29th March 2005, 01:10 PM

Poss Duncan amps..for schematics.....
Watch out.........

.Sometime ago I across a golden oldie with AC/DC chassis of the sim vintage.....double check mains/line input.

richj

majorarmspeed · 29th March 2005, 07:45 PM

I do indeed have the amp; I bought it on FleaBay and it was delivered yesterday, but posting the auction pic was quick and easy.

And it's pretty rough. A cap can is physically disintegrating, the wires out of the octal connectors have been cut, and it looks like it's been sitting for about thirty years. That's the bad news. The good news is that there don't seem to be any major corrosion issues, the cloth covering on the wires is intact and not fragile, and the solder connections look solid. And, it looks cooler than anything I've owned in my 47 years.

More bad news: no schematic on the bottom cover, because there is no bottom cover.

Lots of work before it comes within ten feet of live electricity, but I'm psyched.

Tekko · 29th March 2005, 07:51 PM

So take some pics, i want to see this thing! Both inside and outside. What tubes does it use ?

majorarmspeed · 29th March 2005, 08:37 PM

Photos will follow tomorrow; the tube lineup is 5U4, 6L6, 6L6, 6N7, 6J5, 6SJ7, 6SJ7.

Giaime · 30th March 2005, 10:36 AM

Quote:

Originally posted by majorarmspeed
5U4, 6L6, 6L6, 6N7, 6J5, 6SJ7, 6SJ7.

YOU ARE A LUKY MAN! those tubes are very useful in a guitar amp... especially the 6L6 outputs...

29th March 2005, 11:14 AM	#4
audiobot diyAudio Member Join Date: Sep 2003 Location: iowa	schematic My experience with Strombergs of this era is that the schematic is pasted on the inside of the bottom cover. Have you opened it up? Michael

29th March 2005, 01:10 PM	#6
richwalters diyAudio Member Join Date: Sep 2003 Location: Alps:Tube amp designs over 150W, SMPS guru.	Poss Duncan amps..for schematics..... Watch out..........Sometime ago I across a golden oldie with AC/DC chassis of the sim vintage.....double check mains/line input. richj

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29th March 2005, 07:43 AM	#2
Giaime diyAudio Member Join Date: Oct 2004	Wow! Great! You could avoid remounting in a separate enclosure... that looks so cool! The first thing in pa-guitar amp job is to check if the pa works as it was intended to work. First repair the pa then convert it to guitar amp. Sorry, no schematics. Could you tell us what tubes are inside?

29th March 2005, 08:26 AM	#3
Tekko diyAudio Member Join Date: Jan 2005	pics PICS Take some pics of the inside.

29th March 2005, 12:54 PM	#5
Giaime diyAudio Member Join Date: Oct 2004	I think that the guy hasn't recived yet the amp in question... just look at the ebay logo under the picture...

29th March 2005, 07:45 PM	#7
majorarmspeed diyAudio Member Join Date: Mar 2005 Location: Oregon	I do indeed have the amp; I bought it on FleaBay and it was delivered yesterday, but posting the auction pic was quick and easy. And it's pretty rough. A cap can is physically disintegrating, the wires out of the octal connectors have been cut, and it looks like it's been sitting for about thirty years. That's the bad news. The good news is that there don't seem to be any major corrosion issues, the cloth covering on the wires is intact and not fragile, and the solder connections look solid. And, it looks cooler than anything I've owned in my 47 years. More bad news: no schematic on the bottom cover, because there is no bottom cover. Lots of work before it comes within ten feet of live electricity, but I'm psyched.

29th March 2005, 07:51 PM	#8
Tekko diyAudio Member Join Date: Jan 2005	So take some pics, i want to see this thing! Both inside and outside. What tubes does it use ?

29th March 2005, 08:37 PM	#9
majorarmspeed diyAudio Member Join Date: Mar 2005 Location: Oregon	Photos will follow tomorrow; the tube lineup is 5U4, 6L6, 6L6, 6N7, 6J5, 6SJ7, 6SJ7.