Latest acquisition: DX-35

[al winfrey]

Bruce and Chris,

I too have an "orphaned" DX-35 that I bought as junk a few years ago and brought back to
life. I noticed the grid drive problem right away and put it back on the shelf for
another day, not wishing to fry the 6146 final.  I'd be interested to know what the
factory fix was.

As for knobs, I sent a note out earlier to Chris about the possibility of buying a
relatively inexpensive piece of older Heath test gear that has knobs that match your
DX-35.  I got two of the smaller ones from a signal generator that cost me five dollars
at a hamfest. I used the others on a haggard DX-60 and then replaced the knobs on the
signal generator with some small pointer knobs. It's still being used also.

al winfrey - wa9hsl
....

Bruce Muscolino wrote:

> Chris,
>
> I cannot offer any recommendations on the knobs.  In fact I could use
> the two lower front panel knobs myself.  I changed them for different
> style knobs about 1957 and the originals have disappeared.  I don't see
> any signs of degradation on the other knobs.
>
> As you can see from the above I have owned my DX-35 since 1956.  It was
> one of the first ones kitted by Heathkit, and served me well for about 5
> years and as a loaner for another 5 years!  There is only one caution I
> could give about using the rig.  The early DX-35's had a grid drive
> problem which was cured by the factory in a service bulletin.  The grid
> drive tended to run over the recommended 3 ma.  The result was to
> quickly kill the 6146 output tube.  Check yours carefully when you get
> it running.
>
> I used mine crystal controlled until I got my General and then switched
> to a VF-1, which I also have.  The VF-1 did drift a bit, but fresh
> capacitors in the grid divider circuit (510pf's) usually fixed the
> problem.
>
> I would replace the electrolytics and any other paper capacitors you
> find.  I would also check all the resistors for drift in value.
> Otherwise, it should be good to go as they say.  One day I will get
> around to restoring mine and look forward to working you.
>
> Oh, I also need the crystal compartment cover.  Does anybody have one
> they would like to sell?
>
> 73
>
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