[Milsurplus] Wanted: BC-610 Tuning Units & Coils

[Kenneth G. Gordon]

On 12 Dec 2017 at 6:59, Robert Kilian wrote:

> Working on bringing a BC-610-E back to life and need tuning units & 
> coils for 80, 40, and 20 meters.
> 
> Anyone have some they're willing to part with?

Hello, Rob: I don't have any tuning units left here, but I had both an "E" model back in the 
1960s, and an "I" model later.

I have seen both the TUs and the coils on eBay at irregular intervals.

The "E" model was given to me by AFMARS and was truly a derelict. It was a real mess.

One thing I found is that there is either an RF choke or a resistor (I can't remember which) 
UNDER that phenolic board in the final amp compartment on which the 250TH is mounted.

That was burnt up in my "E" model, apparently from some parasitic which occurs on some 
frequencies.

You might wish to check for that. I found it by accident when I had to change the socket to 
that special one for the 304TL when we could not find any 250THs.

I and another AFMARS member who had also been given an "E" model by AFMARS 
installed 304TLs and modified our '610s for Class B linear amplifiers and used them very 
effectively for 'phone patching into the SEA area on frequencies above 20 meters.

He drove his with a KWM-2A and I drove mine with a modified Heathkit SB-101.

BTW, the power supplies in both models are very, very robust, but 1) watch for the settings 
of the overload relay. That can be off quite a bit and will cause problems. and 2) you may 
wish to replace the 866 rectifiers with 3B28s, which are far more forgiving of overloads and 
cause far fewer problems than the 866s. Except for the pretty blue glow, I have never liked 
MV rectifiers.

vy 73 for now,

Ken W7EKB


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