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BRM-
It's an interesting approach, curious to see some schematics as I was expecting 'passive' to mean transformers/no buffers at all.
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It looks like the power cables are connected but that's the battery wires tucked under the board. The red, white and black power wires were wired in from below and are out of shot. Temporary of course until I'd built the power supply.
Dramatic_Hammer
Airhead
So a 'preamp' that has no gain, just attenuates?!