[Milsurplus] RT-70

[Jack Antonio]

On 1/4/2017 2:42 PM, Bruce Gentry wrote:
> I'm getting a couple RT-70 transceivers and the matching audio
> amplifier/power supplies working, and need connectors. I also have the


Problems I had with my RT-70 and AM-65:

Either relay K1 or ballast tube R-32 were bad in
the AM-65. Maybe both. This is from 10 year ago
memory, and any notes I took have gone AWOL.
These two components are in an over-voltage protect
circuit, and it was intermittently protecting when
it didn't need to. Of course it worked fine on the
bench, and only cropped up when I took the radio to
MRCG to play with. I found exact replacements,
but from where I don't recall. Possibly Fair or eBay.

Vibrators sticky, but a bit of tapping and use got them
working again. I think I was lucky there.

Intermittent squelch in RT-70. Found a number of leaky paper
or film type caps in audio section, replacing made squelch a little
less flaky. As I remember there were two different
types that looked the same, but one was
physically larger than the other. The large ones were
good, the small ones were all leaky.

Finally found that the tip of the tip of the last
limiter had broken off, was hard to see visually.
I think that particular tube was a bit taller than
the normal size, and it had broken off when the radio
was pulled out of the case.

Strange thing is that the receiver still functioned,
although volume was down and squelch just didn't
work right.

Last problem is that the 1Mc calibration crystal was
missing, I replaced it with another from the "box du junque",
it sort of works, but the cal signal is weak.

Hope this helps you get your set running.



Jack Antonio WA7DIA/4