hw-101 cw (part 2)

[Mark S Graalman]

  Jim,  I think a mod that was done to those rigs was to
change the cathode resistor in the tone osc from a 1K ohm
to a 680 ohm unit and the osc would start much better.

Mark  WB8JKR


On Sun, 19 Dec 1999 17:13:20 -0700 n7kbj <n7kbj at ONEIMAGE.COM> writes:
>Part 2:  with the help of several who replied to my first post, I
>found
>several
>resistors that had gone out of spec - replaced them and some
>electrolytic
>caps
>(on general principles) and good news - the rig now works much better
>on cw
>than it did - when it works.  It appears to be a 'thermal' problem as
>cw
>works
>fine when the rig is first turned on - after 1/2 hour warm-up, kapoot.
>Tracing
>the tone thru V15 (the tone osc and amp) I find I'm losing it right at
>the
>input
>(pin 9) - either no tone or it slooowly builds over about 5 seconds.
>So - my next question:  I'm begining to suspect the 'PEC' that forms
>part of
>the
>osc as everything else in the osc circuit either checks out or has
>been
>replaced.
>Can one 'breadboard' together a substitute for the pec and have it
>work ok??
>or is there a replacement source for the pec?
>
>Jim - n7kbj at oneimage.com
>
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