If you have any expertise with a Gonset GSB-201 amplifier, pleas lend me your
insights.
I am getting a Gonset GSB-201 that has modifications. I don't have it yet so I
don't know the extent of what was done to it. From the photos and the paint
scheme, I can tell is was an original version, it now has 4 - 572B tubes in it,
the HV power supply filter capacitors have been replaced with modern ones (on a
circuit board), and the HV choke input filter choke is missing.
I have a manual that covers all the GSB-201 versions. Later versions
substituted the 572B tubes for the 811A tubes but did not change the 1500 V
power supply. I had been thinking that changing the HV supply from choke input
to capacitor input would boost the HV up to 2100 V and eliminate the need for
the 50k 100W load resistor (it adds 45W of extra heat). The increased plate
voltage would allow the 572B tubes to run twice the power with the same final
tank circuit load impedance.
The Questions:
Can the power transformer handle the instantaneous peak current demanded by a
capacitor input filter? Can the final tank circuit components handle the
increased peak RF voltage and current? (Blocking cap, plate tuning cap, HV DC
RF choke). Has anyone done this successfully?
73s - Jeff - KA9S
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|