[R-390] Replacement pto arrived.

[Phil Atchley]

Hi!
This morning I picked the replacement PTO up at the post office.
Examination disclosed the following. =20
1. No label but it is obviously a Cosmos PTO from the fact that it has =
the
25KHz linearizing screws that only the Cosmos units have.

2.  It's an older unit, the coax shield and outer covering (green =
instead of
white) around where the coax exits the PTO is cracked all the way =
around,
with the shield basically non- existent.  Some light corrosion on the
housing and around where the power cable exits the can.

3.  Bent slug shaft on the output transformer (the small can).

4.  The linearity adjust screws has those itty bitty hex or fluted screw
holes instead of the slots, the size nobody can find a tool to fit 8^)  =
(I
'might' have a itty bitty fluted wrench that will do the job)

An electrical check of the unit showed that it's working but the end =
points
are out by over 12 KHz, which means that I'll have to go into the unit =
and
tweak the end point coil and check other things.

While I'm inside it I'm going to do a thorough examination for overall
condition etc.  It may behoove me to use the flexible linearity ring to
repair the other unit since it's in otherwise pretty nice condition.  A
little more work but I want the best possible PTO in this radio!

73 de Phil, KO6BB

****************************************************
*  DXing THE WORLD WITH THE FOLLOWING EQUIPMENT.   *
*  RECEIVERS:                                      *
*    '67 EAC R-390/URR Surplus Receiver with a     *
*            HAMMARLUND HC-10 Sideband adapter.    *
*    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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