I am restoring a set of Steinhart monoblocks. The job is quite extensive: the metal enclosure was repainted and the electronics upgraded. I took some photos. I cannot locate the "before" photo of the complete unit. Here are some shots from the restoration process:
First job was to strip the old paint. (Next time I would rather manufacture a new set of brackets)
Here is the painted brackets with transformers mounted again
Tube sockets were added to neaten up the wiring and improve tube changes.
tube side
blocks running in
I would like a schematic for this unit.
The circuit configuration is a Williamson ECC82 input/phase inverter with ECC82 cathode followers driving the eight PL519's.
The differential driver has a CCS on the long tail side.
Curious aspect: the differential driver gets it's plate voltage from the cathode followers following it. There is 400V over the ECC82 differential driver, but the ECC82 measures fine after decades of us. I would like to know how to adjust this voltage to a more reasonable 250V without compromising the block's output power. Any ideas?
First job was to strip the old paint. (Next time I would rather manufacture a new set of brackets)
Here is the painted brackets with transformers mounted again
Tube sockets were added to neaten up the wiring and improve tube changes.
tube side
blocks running in
I would like a schematic for this unit.
The circuit configuration is a Williamson ECC82 input/phase inverter with ECC82 cathode followers driving the eight PL519's.
The differential driver has a CCS on the long tail side.
Curious aspect: the differential driver gets it's plate voltage from the cathode followers following it. There is 400V over the ECC82 differential driver, but the ECC82 measures fine after decades of us. I would like to know how to adjust this voltage to a more reasonable 250V without compromising the block's output power. Any ideas?
