fitz
Ambassador of DIY
With the idea and some guidance from the M Forum, I installed a volume mod on the extra gain stage HDR mode on my Vintage Modern 2266.
The HDR mode has a significant volume jump when switching from the LRD mode.
Apparently, replacing the 470k R15 resistor with a 500k pot can adjust this volume difference.
With unity volume between the 2 modes, the amp can be used more like a channel switcher.
I've replaced the power rocker switch with a lighted switch and put the new HDR volume pot in the indicator light hole.
The 500k pot I dug out of the bin is reading about 420K in the circuit.
Also scrounged a lighted on/off/on rocker switch to test if this whole thing works...
Going to order a proper switch and a better pot, but the under-board work is done.
Swapping out those 2 components will be a minor task when they get here.
The HDR mode has a significant volume jump when switching from the LRD mode.
Apparently, replacing the 470k R15 resistor with a 500k pot can adjust this volume difference.
With unity volume between the 2 modes, the amp can be used more like a channel switcher.
I've replaced the power rocker switch with a lighted switch and put the new HDR volume pot in the indicator light hole.
The 500k pot I dug out of the bin is reading about 420K in the circuit.
Also scrounged a lighted on/off/on rocker switch to test if this whole thing works...
Going to order a proper switch and a better pot, but the under-board work is done.
Swapping out those 2 components will be a minor task when they get here.