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Re: questions re 300b group build [message #32201 is a reply to message #32198]

Wed, 07 November 2007 18:46

PakProtector
Messages: 935
Registered: May 2009

Illuminati (2nd Degree)

hey-hey!!!,
PSRR of a pentode depends upon what sort of output you're dealing with. In this case it has terrible PSRR, because of the high plate impedance( the plate curves are nearly horizontal). What ever voltage shows up at the top of the plate load resistor, shows up at the plate end too. Now if we were transformer coupled, that behaviour is a plus, because the voltage would not be able to induce a current and w/o current change in the output TX, there is no signal.

IOW, you'll need a clean DC supply for the driver pentode.
Best Regards,
Douglas

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[Message index]

		questions re 300b group build By: duderduderini on Thu, 01 November 2007 07:36
		Re: questions re 300b group build By: real_one on Fri, 02 November 2007 09:59
		Re: questions re 300b group build By: stewcle on Mon, 05 November 2007 15:50
		Re: questions re 300b group build By: PakProtector on Wed, 07 November 2007 18:46
		Re: questions re 300b group build By: RC Daniel on Thu, 22 May 2008 04:16

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