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Old 6th December 2011, 06:54 PM   #1
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Default Parallel feed transformer with SRPP

I have a conversation with a fellow, and he said that someone out there has made a SE driver circuit for 845 that is SRPP driver with parafeed interstage transformer, what is this about?

I try to do a search but no one has made such circuit, but I actually found some transformer winder has said that "at para feed or feed mode is parallel to the transmitter, decoupled with a capacitor in parallel to the tube. The task of the working resistance takes on either an anode choke (choke load) or an additional tube (SRPP)."

Since all my friend has build a driver with parafeed transformer that offer by bottlehead and a pure SRPP circuit capacitor coupled. Never heard of SRPP tube with parafeed transformer coupled, this is kind of weird.

Can anyone tell what is this about?
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Old 6th December 2011, 07:47 PM   #2
DF96 is offline DF96  England
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SRPP is for driving a fixed known resistance. If this resistance is very high then the 'SRPP' is actually just a grounded cathode amp with an active load, not an SRPP. Generally, an output grid is either a high impedance (so not really SRPP) or (if grid current is drawn) a very variable resistance (so SRPP not suitable). I conclude that SRPP is not the appropriate circuit to use for this purpose, despite its popularity.
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