[R-390] Z-503

[hamfish at comcast.net]

Hello Ross,

Digging through Wei-Li's Pearls......................
https://www.r-390a.net/Pearls/index.htm and under IF Decks, seems values
between 82pF to 88pF. Also stated on page 340 those parts might have been
mixed & matched for resonance at the factory for 455KC. 

Regards,
Craig

-----Original Message-----
From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> On
Behalf Of ROSS HOCHSTRASSER
Sent: Saturday, February 15, 2020 12:12 PM
To: r-390 at mailman.qth.net
Subject: [R-390] Z-503

Hi all, Pardon me for not shuffling through endless pages of R-390A info,
but I need to know the value of the capacitor in Z-503.  I am having AGC
problems and am coming to my wits end. When  this receiver landed on my
bench, Z-503 was open. I obtained one from K1ANX which has a good coil and
may be A-OK, but I can't get a satisfactory response when tuning it. I am
unable to get full action out of the AGC on strong stations. Swapping the IF
module with my other receiver, the problem follows the IF module. I have
recapped it, changed all of the tubes, checked all of the resistors, even
changed (most) of the silver micas to no avail.  I am suspecting that Z-503
is not at resonance due to  an intermittent cap.( I could very well be wrong
on this...)  The  manual I have shows the cap, but offers no value, in the
parts list it lists the cap as part of Z-503, but gives no value. HELP!!
Thanks, and 73 Ross W1EKG
______________________________________________________________
R-390 mailing list
Home: http://mailman.qth.net/mailman/listinfo/r-390
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:R-390 at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html