[Collins] Question re:75A-3 image problem

[daveaust at pol.net]

I have a 75a-3 that I haven't really ever used until recently. It works
but has very serious images at about 3.3  and 3.6 a few hundred kc wide.
Also same thing up on 20Meter band in wide spots across the band. Sounds
like AM bcb bleeding through but haven't been able to match the distorted
signal to anything on my am radio. When away from the noisey areas on the
dial, the real signals sound fine although the rx is fairly def unless I
REALLY peak the antenna closely with my mfj-949 tuner(longwire & hy-gain
vertical). I dont know if that means anything or not but my other
rx's(r-390,nc-300,HROs...) front ends seem to be more broadbanded and can
literally pick up signals with a piece of wire. Also, I don't get this
same interference on my other rx's using same antenna, etc, so I'm
concentrating on the receiver. I recently aligned it via the orig manual
and checked all tubes. PTO tracking isn't too far off. Most caps were
changed by prev owner. Everything else with the receiver looks fine
otherwise. I'm not sure where the "leak" is coming in via mixers or what.
I'm not an expert on rx repair so I thought I'd ask some experts on the
list to find out if this kind of problem usually boils down to just a few
things. Any help or suggestions will be GREATLY appreciated. Thanks/73,
dave austerman, N5WNM, Oklahoma