[R-390] Testing the 2nd osc, swapping xtals

[Larry H]

Dave,  Good deal on most of the new tubes working better.  One problem
solved.

I know that getting that 1st osc tube out is a pain.  I have a forceps
style tube puller that I use for that one and many others.  It makes it
quite easy to get them out.  I have an extra one if you'd like to have it
at my cost, $15.

I'm not focused on doing the rest of my knobs right now, the VFO started
binding periodically so I'm getting into that right now.  It's the
progresitron style, the name has been removed.  Looks very clean inside and
the core end nut is just right  tight on the shaft - “hallelujah”!!

Regards, Larry

On Tue, Aug 6, 2019 at 1:22 PM dog <agfa at hughes.net> wrote:

> Got the new 5654W tubes today. 3 of the 4 are much better, they appear
> to be GE. One is crap. In the EAC, it makes spec everywhere, 8MC is
> worst at -4.5V. But in the Dittamore the tubes didn't do anything. So it
> looks like that RF section needs to come out and replace the bypass and
> feedback micas and anything else that strikes my fancy. Haven't worked
> on the high voltage 1st osc in the EAC yet. That tube is really hard to
> get to.
>
> It's almost like in both RXs the same frequencies in the 2nd osc are
> low, it appears to be a pattern. 8, 15, 17, 23 and 24 are low, and the
> very high freqs, 25 and above, are high, over -7V. It would be
> interesting to know what the voltages were when new.
>
> I didn't notice that swapping xtals did anything at all. But I also
> haven't tried just an LC circuit in place of the xtal.
>
> I'm actually caught up with the mowing. With all this rain we've been
> having the fields are full of some sort if invasive creeping grass
> undergrowth. I usually mow in 5th (out of 8) gear, I had to mow in 3rd
> this year. I can still mow 10 acres in under 5 hours. Now I've got the
> little fields to do and they're a pain.
>
> Dave N3DT
>
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