[TenTec] Titan 425 power supply woes

A R raf_3 at msn.com
Mon Jan 29 19:32:06 EST 2018


Yeah. The relay and cap on the load side of R2 test good, and other circuitry on the source side is healthy. The failed R2 still has piecemarking legible: HE19316, RT-25, 20 ohms. Don't recognize the HE19316 (mfg ?). It's looking like the failure was one of a latent fault in R2 itself. Got a 50W 20 ohm chassis-mounted resistor on order from mouser.
Also going to redesign/reconfigure the HV filter cap "nest" and it's mounting hardware that secures nest to the chassis botom plate. Original mounting of that nest involves stacking two thin (0.060) acrylic sheets separated by 5 thru bushings, separated from the chassis bottom by 5 thru bushings, and all of that stuff "secured" to the chassis bottom by five  1-1/2"  4-40 screws/nuts/washers....all of that stuff "floating", non-captive. Removal of that nest is necessary to gain access to/removal of the 81212 rectifier board. It'll go back together configured a whole lot more "assembly-friendly". If anyone is interested in the redesigned nest, let me know off-line, and when it's done I'll provide the details.

73,
Allen--W7GIF
----- Original Message -----
From: Stuart Rohre<mailto:Rohre at arlut.utexas.edu>
To: tentec at contesting.com<mailto:tentec at contesting.com>
Sent: Monday, January 29, 2018 3:40 PM
Subject: Re: [TenTec] Titan 425 power supply woes

sounds like the  R2 failure was a current limiting resistor, to not
apply a big surge to the associated rectifier.

Stuart Rohre
K5KVH
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