[Hallicrafters] Halli 40A...an extra jack-in-the-back?

[Ian]

Terry,

Check what's attached to the chassis side of the connector and see where it
goes.  A bit of simple circuit tracing should answer your question quickly. 

If you find a short piece of small shielded wire attached to a capacitor to
an IF area connection it's likely for a Q-Multiplier.  That was a common
addition those days for low end receivers without a way of narrowing the
bandpass or getting rid of an annoying heterodyne.

And if it jumps right to the antenna terminals then it's for an antenna
which also wasn't uncommon.

Ian, K6SDE

-----Original Message-----
From: hallicrafters-bounces at mailman.qth.net
[mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of
Zengmeiste at aol.com
Sent: Saturday, December 03, 2005 10:13 PM
To: hallicrafters at mailman.qth.net
Subject: [Hallicrafters] Halli 40A...an extra jack-in-the-back?

  So the 40A works fairly well, but reception is not great, due to huge COM 
ED xformers just outside the window and other (DSL-related?) interference,
darn.

   I noticed an RCA jack on the back, just above the antenna lugs, doesn't 
look original and the manual mentions it not.  I've heard  some Halli's were

modified to use an outboard device for improving reception...or   could it
be a 
PHONO input?! I'd rather not blow anything up but I'm tempted to uhh plug a 
cord in and see what happens..
  Thought? Thanks and 73s, Terry