Unfortunately Oa2 data sheet can not help me. There it is not said whether it is possible to include Oa2 without load (while the loading tubes are cold).
And about the rectifier ss or tube:
In the beginning, I had a rectifier on a 6X4 tube.
Everything worked well, but I have a small case and it was very hot for him.
In the technical description REDD.47 it is written -
- "" H.T. is fed in at between 380 and 400 volts direct from the small reservoir condense: of an external rectifier unit. An additional reservoir condenser is incorporated in the amplifier. Thus when several amplifiers are connected to a common rectifier unit, the total reservoir capacitance increases roughly in proportion to the load current. Provided that the rectifier and transformer internal resistance are small, this results in much improved regulation of the power supply, and the voltage remains approximately constant, indepen ent of load.""
In the original circuit REDD.47 - the capacity of the first filter-capacitor is 80u.
Given that there are quite a lot of REDD.47 amps in the console, when they are turned on at the same time, a rather large capacity is obtained.
I did not hear about the rectifier tube, after which it is possible to use capacitors of such a large capacitance.
I think it is quite logical to assume that the original rectifier was - SS.
My version of the HV power supply, filter resistors - 510 Ohm (instead of 1K) - for my transformer.
Now I have put a separate switch after the diode bridge, I'm still afraid to immediately apply voltage to the Oa2.
And if you use filter resistors, as in the original scheme - 1K., Then the transformer should produce an even higher spinning that would "set" Oa2 on fire.
And when you turn on without load, will it be even more dangerous?
Although maybe I'm wrong and it's possible to do without a separate B + switch.
- This is my question.