[Drake] Re-cap on TR-4

[Mel Vance]

> 
> Most likely a short on the filament line somewhere.  Look at the
> schematic (verify it matches your serial number) and examine the
> series / parallel filament wiring that includes the dial lamps.  It's
> possible that it is a heater-cathode short in a tube, shorting the
> filament string to ground at that point.  Bottom line is something is
> shorting out a portion of the string, increasing the voltage on the
> rest in that string.  Measuring the filament voltage across each tube
> "may" help.
> 
> 1.  Any electrolytic is suspect.  Lacking an ESR meter, just replace
> them.   Watch polarity!
> 
> 2.  The can is not for shielding, underchassis caps are fine.
> 
> 3.  It's a start!  :-)
> 
OK.....re-cap is a very good idea......

To make sure, I can replace all tubes except driver and finals with out doing a bunch of re-
tuning, right? Think I have all tubes except finals in the tube case...should fix any bad 
filaments, and with a re-cap and touching up the tube sockets *should* fix the major 
problem...

Now, any ideas on the dead 10mtr segment...Dirty segment switch? Bad xtl? Any other 
common causes?

Mel
N7OKL