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09-24-2019, 03:08 PM
Hi Sinusoids
The designed output power is only 10W for Soma-84. Gain is a bit on the low side as it was designed for a specific player.
You can get a bit more gain by rewiring the MV using a dual pot to replace the 909k grid-leaks and remove the 100k series Rs to the output grids. To retain some of the tone you might want to increase the 9k09s to 15k or 22k.
The parallel input stage can also be rewired as two cascaded stages without cathode bypasses and with attenuation between them - this can be tweaked for whatever extra drive you need.
The designed output power is only 10W for Soma-84. Gain is a bit on the low side as it was designed for a specific player.
You can get a bit more gain by rewiring the MV using a dual pot to replace the 909k grid-leaks and remove the 100k series Rs to the output grids. To retain some of the tone you might want to increase the 9k09s to 15k or 22k.
The parallel input stage can also be rewired as two cascaded stages without cathode bypasses and with attenuation between them - this can be tweaked for whatever extra drive you need.
