[R-390] 390A help...

[G4GJL@aol.com]

I had the same problem...the key is that the fault is on every band. The most 
likely cause is the PTO running out of sufficient feedback to maintain 
oscillation.

In my case the problem was cured simply by changing the PTO tube for a newer 
one with higher emission. Dont use brand new / NOS as these tend to drift 
more. Swap with one from the IF strip, and put the newer bottle in the IF.

An alternative problem could be a capacitor in the PTO feedback circuit, but 
as I dont have the precise circuit schema to hand I will leave it to others 
to pick up on this  part. Try the tube first, its 95% odds on that!

73

Pete
G4GJL


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