[Drake] TR4C weird xmit trouble

[Mark Nace]

I had a TR4-C one time in which one of the rotor plates was bent, and actually 
touching the stator on the Rf tune varicap.  I carefully (very carefully, 
unpowered of course, with the power supply detached and unplugged !!!) bent it 
back with a jewelers screwdriver.  Not sure if  this might be your problem...
73
Mark
N5KAE



----- Original Message ----
> From: Dick KF4NS <kf4nsradio at verizon.net>
> To: DrakeRadio list <DrakeRadio at yahoogroups.com>; drake at mailman.qth.net
> Sent: Mon, October 4, 2010 5:09:26 PM
> Subject: [Drake] TR4C weird xmit trouble
> 
> Ok guys, I have this black cloud over me right now. The radio is 
> receiving fine (other than the filter defect) and I decided to get the 
> xmit completely checked out before I wrap it up.
> 
> All of a sudden while on 20M band position and checking the PS bias, 
> it jumps intermittently to 400-600ma with no drive, sideband switch in 
> ccw position (actually  makes no difference), dummy load connected and 
> no mic or key connected.
> 
> After quite a few hours pulling out my hair (just the gray ones) I 
> tweaked the TUNE control and the trouble went away. I tried full ccw 
> and cw and everything  in-between on all the other bands and no 
> effect, only affects 20M and only when the TUNE control is between 1 
> and 6. I checked and rechecked the band switch contacts over and over. 
> What the heck, I even tapped all the tubes and every other silly 
> thing. Given time and a few cups of coffee I can usually make sense of 
> these kind of things but not this time. HELLLLLP!!
> 
> 73, Dick KF4NS
> St Petersburg, FL 33714 USA
> Keep The Glow! 
> 
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