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Unless you want to restore this valve equipment as
much as possible to its original state ,you could of course adjust the screen voltage with a carbon track potmeter , using a high voltage transistor ,a high voltage zener diode and a few more passive components. True. This transmitter only has a single HV winding, so all the B+'s for the non-final stage go through big power dropping resistors, and then there's all the screen bias dropping resistors too. I haven't added it all up, but this transmitter probably dissipates close to 70W when not key-down in dropping resistors just to avoid a second winding on the power transformer. If I were to re-do anything I'd start by adding another power transformer for screen bias and non-final B+'s. Tim. |
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