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At the brain trust last night, John Windt shared this this bit of information.While it is not a complete schematic, it is a flow chart of the 5 channel amp.Basically the direct box was a 12ax7 and a 12au7. there was a trim pot between tubes which was used to set level, it's why it is described as a fixed gain preamp. The rest is self explanatory. I didn't get to ask, but when I showed this to a friend he wondered if there was a buffer for the VU meter. I suspect that because of when this was built combined with using a true VU meter, that a 3k9 resistor was just attached at the output and would feed the meter and that it wouldn't cause any increase in distortions, but that is just a guess.
At the brain trust last night, John Windt shared this this bit of information.
While it is not a complete schematic, it is a flow chart of the 5 channel amp.
Basically the direct box was a 12ax7 and a 12au7. there was a trim pot between tubes which was used to set level, it's why it is described as a fixed gain preamp. The rest is self explanatory. I didn't get to ask, but when I showed this to a friend he wondered if there was a buffer for the VU meter. I suspect that because of when this was built combined with using a true VU meter, that a 3k9 resistor was just attached at the output and would feed the meter and that it wouldn't cause any increase in distortions, but that is just a guess.
