Hi Guys,
Am I cursed here, or what...?!
After literally weeks of flawless, dependable service, the PTO in my Drake T-4X
transmitter has returned to its good ol' wobbly self again (SIGH!). It started
last night---thinking that maybe the PTO signal was being affected by something
external to it, to-day I meticulously cleaned each & every wafer / contact on
each & every switch, cleaned the tube sockets / pins of all of the tubes &
crystals, and visually inspected everything that I could under the chassis...
My reward for all this work...? Continuous wobbliness / warbling of my
signal...!
I think I'll do what Garey did with Steve's PTO, & simply wholesale replace
that white tubular capacitor that's inside the PTO (in the T-4X that I have,
it's the cap that has one lead soldered to the main horizontal PTO circuit
board, with the other lead connected up top the front / vertical "sub" board).
If memory serves me well, Garey, you deduced, from my description of the colour
dots on my cap, that it is a 33 pfd. unit.
I think I have some silver mica caps on hand here that I can sub it with---may
have to parallel whatever I replace in there with a small trimmer of some
description to preserve linearity...
WHAT A PAIN...!!!
~73~ de Eddy VE3CUI - VE3XZ
_______________________________________________
Drakelist mailing list
[email protected]
http://mailman.zerobeat.net/mailman/listinfo/drakelist
