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[Amps] 8877 cathode impedance

To: "" <>
Subject: [Amps] 8877 cathode impedance
From: Steve Bookout <>
Date: Mon, 26 Nov 2012 19:36:21 -0500
List-post: <">>
Hello all,

Want to re-do the input matching of an old HB 8877 amp.  What should I use for 
the cathode impedance when calculating my pi network?  I recall it was 
something like 50-60 ohms.

Also, thinking attenuating the drive power AFTER the T/R relay and before the 
matching network.  Right now it only takes 22 watts for 1500 out at 4 KV.  A 
bit touchy to tune (only been like that for 27 yrs.)  Would be nicer to tune at 
60, or so, watts out.  I saw where Henry radio has some attenuators on Ebay 
that might fit the bill.


73 de Steve, NR4M

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