[TMC] GPR 90

[Darrel Nichols]

Don't overlook the simple explanation either.  Like the band switch...

N0DBX


> [Original Message]
> From: sebdesn <sebdesn at ecentral.com>
> To: TMC <tmc at mailman.qth.net>
> Date: 3/22/2005 6:18:00 PM
> Subject: [TMC] GPR 90
>
> Hi Folks,  I am working on a GPR90 that will not work on the 2nd if
> bands...I have had it come on and work a couple times, and then once it
just
> "faded out" and another time it would not come on after I switched the
send
> receive switch. I adjusted L19 in an attempt to get the 2nd if  oscillator
> working but to no avail. Have checked all the tubes and found two bad
6ba6's
> and replaced them with 6au6.(all I had on hand), the buffer is still a
6ba6.
>  Did the resistance measurements on v4 and v5. all ok except for pin 1 on
> v4, it is 152K and supposed to be 15K. According to the schematic I have,
> r25 is supposed to be 15K and it is 150K. Would that cause the osc. not to
> play???
>    There is also a cracked disc cap (the red disk ones that say 10K) on
tube
> v8..
>
> Any way I am stumped..Any light anyone could shed on this would be greatly
> appreciated....
> 73,de Bud WØHG
>
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