[Hallicrafters] SX-28A issues

[Richard Knoppow]

----- Original Message ----- 
From: "Mike Everette" <radiocompass at yahoo.com>
To: "Richard Knoppow" <1oldlens1 at ix.netcom.com>
Cc: <hallicrafters at mailman.qth.net>; <magnuson at mac.com>
Sent: Tuesday, April 15, 2014 7:22 AM
Subject: Re: [Hallicrafters] SX-28A issues


If I remember right (don't have my manual handy), the B plus 
for the push pull audio stage in the SX-28 comes from the 
rectifier tube side of the choke; so the only filtering for 
the audio B plus is the filter's input capacitor.

The choke itself is only rated for 110 milliamps.  The audio 
section pulls close to an additional 100 milliamps.  If 
everything went through the choke, that would be one huge 
hunk of iron (as if it ain't already big).

Symptoms sound like the input filter cap may be open.

73

Mike
WA4DLF

      I looked at the schematic, you are right about the 
output amp.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com