PakProtector
AK member
hey-Hey!!!,
So here is the schematic for the 6CB5A/EL84 amp I'm building. There is some missing bits; the heater transformer is missing along with the 6NO45T delay for the plate transformer primary( to pre-heat the 866's ), and the bias supply transformer and filter. Each monoblock is going onto a 24x10" plate chassis. Output is a 20-20 Plus S-258-Q. E-Linear taps in this OEM configuration are at 50%, and will be reduced to 25-30% if/when the transformers are taken apart at Heyboer. The screen reg is adjustable from ~80V to 125V and will be tuned after the amp is running. I suspect the preferred OP will not be that for maximum power, but slightly lower so that the load line hits g1=0V well away from the knee in the upper left part of the curves.
cheers,
Douglas
So here is the schematic for the 6CB5A/EL84 amp I'm building. There is some missing bits; the heater transformer is missing along with the 6NO45T delay for the plate transformer primary( to pre-heat the 866's ), and the bias supply transformer and filter. Each monoblock is going onto a 24x10" plate chassis. Output is a 20-20 Plus S-258-Q. E-Linear taps in this OEM configuration are at 50%, and will be reduced to 25-30% if/when the transformers are taken apart at Heyboer. The screen reg is adjustable from ~80V to 125V and will be tuned after the amp is running. I suspect the preferred OP will not be that for maximum power, but slightly lower so that the load line hits g1=0V well away from the knee in the upper left part of the curves.
cheers,
Douglas