[Elecraft] K2 #7340 PreAmp Problem

[Don Wilhelm]

Ray,

It is great to hear that you now have it working properly.  Good find.

73,
Don W3FPR

On 12/26/2012 6:30 AM, Ray Spreadbury wrote:
> Hi Don
>
> I did a check on the voltage divider resisters as you suggested & found that
> R75 read 82 ohms rather than the expected 680 ohms! I had accidentally put
> in an 82 ohm resister (R94! From the buffer circuit) and put the R75 680 ohm
> resister in the R94 position - they are consecutively fitted on page 59 on
> the bottom of the board and whilst I check the resistance before fitting I
> must have mixed them up!
>
> I switched them round and the PreAmp now works as it should. The dc volts
> are now E 1.51vdc, B 2.22vdc & C 12.89vdc.
>
> Thank you so much for your help Don, and I feel I've really learnt something
> as well!
>
> 73 Ray G3XLG
>
>