[Hallicrafters] SX-117 disaster

[Bill Stewart]

Jeff,
I'm sure some of us have done the same thing. Hopefully,
your damage will be minimum. I am by far, no expert at this
but just looking at the input circuit I see several coils.
(Check or swap the rf tube...just something easy to ck.)
You might start at the rf amp and work back toward the ant
connection....esp. the one that had rf from the tx, and look
for charred areas on the coils and other parts. J2 has the most
'stuff' with J1 going to a switch. You might be lucky and have
an open on the outside of the coils(s) near it's connection
point(s). Ck the 'antenna shunt' coil, L2...maybe it went first.
S1A feeds the grid of the rf amp...ck for burnt/open contacts.
Also you can ck coils with an ohm meter to ck for opens. If
you hve a signal gen you might be able to inject a signal at
various points from the rf amp back and find a defective part.
Agn, this is just some generic suggestions and I'm sure there are
others on the list with a lot more knowledge than me.
Good luck....73 de Bill K4JYS


----- Original Message -----
From: "Jeff" <jeff at podengo.com>
To: hallicrafters at mailman.qth.net
Sent: Sunday, July 31, 2016 3:05:32 PM
Subject: [Hallicrafters] SX-117 disaster

Looking for some advice or consolation...

Previously well working SX-117/HT-44 twins.  I hadn't run them in a long 
time, and many cables got messed with in the mean time. Unfortunately, 
in my haste to hook the pair back up again, I got the transmitter output 
fed into the receiver antenna input...  and then hit transmit to tune up 
the transmitter...

It's taken me a while to stop cursing about it, but now my SX-117 is 
deaf as a post.  A quick check of the RF amp and 1st mixer show that the 
tubes are OK.  A signal generator on 14.250 is barely audible, but I can 
no longer get a good strong peak on the preselector.  I can get a bit 
more of a peak on 40 meters, but it's still quite deaf.  I had the rigs 
in 20 meters when the mishap occurred.

It's just about acting like there's no antenna at all hooked to it.  I 
get no increase in noise whether or not it's hooked to the antenna or 
dummy load.


I've had the courage to admit I've done something heroically stupid -- 
so I'm reaching out to the list for any thoughts or guidance as to how 
to fix this.


Jeff


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