[R-390] Cosmos, I broke it 8^((

[Phil Atchley]

Well, I guess with all the taking it apart and putting it back together =
it
was bound to happen. After this last surgery the poor thing is deader =
than a
doornail!  I've since pulled it apart twice and can find absolutely =
NOTHING
wrong.  All coils have continuity, I have both B+ and screen Voltages on =
the
tube, tube lights up, tube is good but "she no worky".

I replaced the 2.2K resistor in the B+ supply as the original was =
somewhat
burned and while I was at it replaced the capacitor that bypasses it to
ground (as it was the only thing I could think of that would overheat =
that
resistor).

I've had it open twice to try to figure out why it doesn't work.  It is =
a
SIMPLE one tube circuit and with 45+ years of tube experience it =
shouldn't
be a challenge for me.  But then engineers have a saying that the two =
most
maddening things in engineering are "Oscillators that don't and =
amplifiers
that do" (oscillate). =20

Anyway, I've put it aside for the evening.  I'm going to pick up the =
guitar
and just have some "fun time" for a couple hours. =20

Maybe tomorrow after church I'll look at it one more time and if I can't
resurrect it I'll resurrect the parts unit I have here.  But I'll have =
to
take the "spring thingy" and linearity disk out of the original PTO as I
don't have the tiny tools needed to tune the disk in the parts unit.  =
Also I
don't like the looks of the coax cable or the output transformer on that
unit (but it does work).

73 de Phil, KO6BB

****************************************************
*  DXing THE WORLD WITH THE FOLLOWING EQUIPMENT.   *
*  RECEIVERS:                                      *
*    '67 EAC R-390/URR Surplus Receiver.           *
*    YAESU VR-5000 Wideband,  REALISTIC DX-392.    *
*    Home built Longwave "Hybrid" CW receiver.     *
*    Others which pass thru or are waiting repair. *
*  ANTENNAS:                                       *
*    Coil Loaded 18.5 Meter Long Sloper.           *
*    Roof mounted Hustler 6BTV 6 band Vertical.    *
*    Scantenna Scanner antenna at 7 Meters high.   *
*  LOCATION: Merced, Central California.           *
****************************************************




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