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Nice!...Is the small box a '71?
As others have mentioned, Marshall did use a mix of the 1watt RS/Allen Bradley and 1/2 watt RS/CTS pots on many '68 - '69 era amps. The 1meg pots...
Did the T3556 also use the gray wire for the 220v tap? I know the T3715 does.
It could be a Dagnall T3715.
I believe George Metropoulos over at Metropoulos Amplification had the eyelets reproduced for his plexi amps he used to build. He maybe willing...
I'm leaning towards 1969 since I don't see the additional mounting hole for the one-piece long version eyelet board. It could be hiding...
It seems like there could have been two different vendors supplying the rear panels for the 12-series Super Bass amps. Some seem to have a heavy...
The 'w' looks normal to me. Looks the same as other Scandinavian 1992's in the 123xx range.
Kinda surprised that Rene blundered...She was a seasoned worker by early 1969.
I'm not sure if the punch pattern is different...Ned B has a few of these amps perhaps he would be willing to look into that.
Another one for your list would be the rear panel on the first 1000 50w metal panel amps. It uses the S/ prefix rather than the S/A.
That would seem like an odd place for a ground loop elimanator. I was thinking more in line of what neikeel mentioned regarding the channels...
I've never seen a resistor placed that before (between the mixers and ground). Also, it looks like it's a 1.5 meg rather than 32K ohm.
A wise choice. Neikeel is one of the best.
Did ya get a chance to check the tag sheet and see who was responsible? Was it:
I thought that started in 1973...
I was close...I knew it was one of the tone stack components that was missing.
I believe they are 1.5mm.
If memory serves me correctly, I believe Ned B bought a board years ago that didn't have a slope resistor...Factory oversight.
Yeah, no slope resistor for the tone stack.