Smokey wrote:
Hello Glowguys,

I am working on a Hallicrafters SX-25 that has a specific li'l nuance
(or better described, NUISANCE) and I am hoping someone out there can help
me.

The SX-25 has TWO RF COILS for the standard broadcast band (Band 1)
preceeding the First Detector/Mixer/HF Oscillator. Both of these coils were
disconnected prior to my obtaining the rig for some unknown reason (the
coils are fine, I've got continuity through the primary and secondary of
each). HOWEVER I also own two other SX-25s and when I compare this one to
those I find the other ones only have ONE RF COIL ahead of the First
Detector/Mixer/HF Oscillator for Band 1.

H-m-m-m-m.

One suggestion I received was that the circuit of the early run SX-25s was
very similar to that of the SX-17, so I compared the SX-17 to the '25
however it shows the antenna jacks connected directly to the 1st
Detector/Mixer and completely bypassing the RF AMP stages on its Band 1
(standard broadcast band).

My Band 1 is dead but I have goot perfecormance now on Bands 2, 3 and even
pretty good performance on 4.

Does anyone have an early run SX-25 and can tell me how these coils are
wired? I've experiemented with a lot of logical combinations I thought might
be possible but none seem to bring in the ball game and neo-conservative
dingbat talk shows for me.

Every schematic I have ever seen for the SX-25 (including those on BAMA and
the originals I own) show only one RF coil in use for the the standard
broadcast band, so if you've got an earlier schematic I WILL PAY MOOLAH for
it.

Thanks for any help you can toss my way.

W9STB

I had one of these about 30 years ago I bought at a yard sell I think
it actually had three RF coils. It had one for the antenna, one for
the first preamp, and one for the second preamp stage. I took it to a
guy in Willacoochee, Ga to get it fixed. He took a few voltage
measurements, replaced a couple of tubes and resistors and tuned it
up. I think he could tell what was wrong with it from the way it
smelled. Unfortunately it and my S40B were both stolen out of storage
about 5 years after I got it. The S40B was in near perfect mint
condition with all the origonal Hallicrafter tubes.

Jimmie