[Drake] Re-cap on TR-4

[ltaft at charter.net]

Try tightning all the little screws that hold the tube sockets and circuit boards to the chassis.  These are the ground connections for the circuits.

73, Larry  K2LT
drakerepair.com
800-687-9161

> 
> From: "Mel Vance" <icra at galaxynet.com>
> Date: 2005/04/22 Fri AM 07:52:28 GMT
> To: Drake at mailman.qth.net
> Subject: [Drake] Re-cap on TR-4
> 
> Have a TR-4 with an intermittent problem, both TX/RX but worse on TX...lights will suddenly 
> get very bright, audio goes to pot, and jumps freq...a good tap or two and rig returns to 
> normal function....
> 
> I suspect bad caps or tube (all tubes except driver and finals test good...driver and finals are 
> all very weak)
> 
> 1) do new electrolytics need to be in the cans for shielding, or is it ok to remove the leads 
> and solder new caps under the chassis? Can get the correct values locally, but are too large 
> to fit in the cans....
> 
> 2) are there other caps that have a known common trend to go bad?
> 
> 3) am I on the right track, or do I need to look elsewhere for the problem?
> 
> Am looking to get the rig up to a better value for sale/ swap for solid state rig, 160-10 
> including WARC and 60...something with extended RX that can be mod for full TX like a 
> 440, 735, ect. Has other issues that I may or may not be able to deal with (1 segment of 10 
> does not work (dirty contact? bad xtal?) and missing a knob)....
> 
> Mel
> N7OKL
> 
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