[TMC] Part needed

[WA5CAB at cs.com]

Larry,

The COL-52286, T-47 and T-47A/ART-13 use a 0.002 ufd plate blocking 
capacitor, 3500 Working VDC, 7500 Test VDC (C-118) and two 0.002 ufd 2500 Working 
VDC, 5000 Test VDC (C-120A & B).  One of those would probably serve to at 
least answer your question.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 10/28/2016 17:45:31 PM Central Daylight Time, 
Telegrapher at Q.com writes: 
> I've been having trouble with my PAL-500 loading.  I've replaced the 
> finals, checked various voltages in the bottom, done continuity checks 
> and other things that have been suggested.  NO success.  Funny thing was 
> that it worked one day a couple weeks back flawlessly generating 40M 
> (7293 Kc) AM with excellent reports from Arizona, Idaho and central 
> Texas.  Then the next day it would not take a load at all.
> 
> The one thing i've yet to try is to replace the .002 4KV plate blocking 
> cap.  While it checks good with power off, i'm wondering if maybe it's 
> really open or mostly open.  If you happen to have a PAL-500 or possibly 
> a PAL-350 it is C217.  I have no idea where someone would find something 
> like this on the market but possibly there are a junker or parts units 
> laying around that might have one inside it.  I'd like to do a shotgun 
> replacement to see if that really is the problem.  Not knowing where 
> else to check with the symptoms i have which are:
> 
> Plate voltage normal, screen current normal, drive varies with input.  I 
> cannot get the final to dip, like there is no tank circuit attached.  I 
> can vary the plate tuning and the plate current varies but it will never 
> dip indicating that it's seeing a load. Power output when the plate 
> current peaks will be a couple of watts never going higher.
> 
> Anyone have something like this around that i could borrow for a test 
> and purchase if it works out?
> 
> Thanks and lets hope this is indeed the culprit as this is indeed a fine 
> piece of equipment.
> 
> Larry
> W0OGH
> 
>