hi all,
just got this amp today and amp wondering if anyone can help me identify it so i can get schematics. it has printed on the back: "AMPLIFIER MADE BR STROMBERG CARLSON TO THE SPECIFICATIONS OF THE INTERNATIONAL ELECTRONICS CORPORATION". it also has the following tubes: 6X5, 6V6, 6SN7, and 2 6SQ7's. any help would be greatly appreciated.
bill
just got this amp today and amp wondering if anyone can help me identify it so i can get schematics. it has printed on the back: "AMPLIFIER MADE BR STROMBERG CARLSON TO THE SPECIFICATIONS OF THE INTERNATIONAL ELECTRONICS CORPORATION". it also has the following tubes: 6X5, 6V6, 6SN7, and 2 6SQ7's. any help would be greatly appreciated.
bill
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Offhand it looks like the amp chassis out of a tape recorder. The magic eye tube would be used for setting record level. I can't read the legend over the two sets of jacks, but input and output would seem likely there. The record/play switch and the record position on the tone control support the idea.
Hard to say what model it came from, possibly clues inside?
With that few tubes, it would not be that hard to draw out the schematic by hand. I do that often for older gear when I need a circuit drawing. Look up each tube in a manula and draw its outline on the page, then draw in the parts from each pin. I suspect that beyond the p[ower supply, most of the tube stages will just be voltage amps, with the possibility that one tube is an oscillator.
Hard to say what model it came from, possibly clues inside?
With that few tubes, it would not be that hard to draw out the schematic by hand. I do that often for older gear when I need a circuit drawing. Look up each tube in a manula and draw its outline on the page, then draw in the parts from each pin. I suspect that beyond the p[ower supply, most of the tube stages will just be voltage amps, with the possibility that one tube is an oscillator.
just above the rca jacks on the left is "mic/phono", and above the jacks on the right is "radio in/audio out".
i'm wondering if the chassis needs a speaker with a field coil to work.
thanks for your help.
bill
i'm wondering if the chassis needs a speaker with a field coil to work.
thanks for your help.
bill
Hi Bill,
Trace the B+ lead. If it goes to the speaker socket, then back to the circuit, the answer is yes. The speaker socket would be expected to have at least 3 pins (transformer on speaker also). There may be up to 4 pins on this type (sep HT leads and speaker leads) in active use unless a hum bucking coil has it's own leads (unusual).
-Chris
Trace the B+ lead. If it goes to the speaker socket, then back to the circuit, the answer is yes. The speaker socket would be expected to have at least 3 pins (transformer on speaker also). There may be up to 4 pins on this type (sep HT leads and speaker leads) in active use unless a hum bucking coil has it's own leads (unusual).
-Chris
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