[HBR] RFamp circuit of HBR-11+

[Hopperdhh at aol.com]

Well it looks like I should have waited to ask the group this question.  I 
carefully read the HBR-11 article, and it is no mistake.  Ted states that the 
cathode resistor is not bypassed.  It always seemed to me like this could be a 
source of feedback.  I know it is basically degenerative feedback, but at some 
high frequency degenerative feedback can become regenerative.  Interesting 
that the HBR-11 thru HBR-13C has been plagued by vhf and uhf parasitics!

Dan K9WEK


In a message dated 12/11/2006 5:24:13 PM Eastern Standard Time, 
Hopperdhh at aol.com writes:
I noticed that there is an unbypassed 220 ohm resistor in the cathode of the 
6AZ8 RF amplifier in the HBR-11 and also in the HBR-13C.  This seems unusual 
to me, but I haven't seen any errata that addresses it.  I'm hoping to start 
one of these receivers soon, so I haven't gotten to that point yet. That is, 
if 
I could I would try it both ways.  Just wonder what the experts out there 
think.

Dan K9WEK
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