1974 Davoli Orbach B3 - 60W hybrid EL500 amp
Posted: 14 Apr 2021, 09:21
Got it dirt cheap, completely underestimating the size of the thing.
I did not find any mention online of Davoli Orbach B3, but it seems to be very close to this Orbach 50
It has an preamp using SN76131N, and what I think is a buffer using a BC109B. The power section seems to correspond to this schematic:
I did some minor work on it, replacing some exploded caps in the preamp. It sounds amazing, but maybe this is just me learning that I like closed cabs? The only problem is a very noisy guitar channel, but after dabblin' with this thing for a day or two, and missing the preamp schematic, my money is on the absence of an input resistor. Bass/organ input has 220k (i think) mixing resistors on the input.
Didn't want to mess with it too much, I may redo the complete preamp with something more interesting.
I did not find any mention online of Davoli Orbach B3, but it seems to be very close to this Orbach 50
It has an preamp using SN76131N, and what I think is a buffer using a BC109B. The power section seems to correspond to this schematic:
Didn't want to mess with it too much, I may redo the complete preamp with something more interesting.