On Wed, 16 Feb 2005 08:08:36 -0500, Dave Hall wrote:

On Tue, 15 Feb 2005 13:36:32 -0600, "Chad Wahls"
wrote:


Did you see any bottom mounted caps connected to the final
transistor? If not then you might have to mount a piece of grounded
shield plate over the final or experiment with bypass caps until you
kill the oscillation. But try setting the bias first. If I remember
right, the bias for the final should be set at somewhere in the 30 -
40 mA range. I'll check the manual and give you the exact value.

Dave
"Sandbagger"

I kinda figured oscillation also. Bad bias can cause it. Make sure that's
correct. See if any one had hinkeyed around in there, Check serial
numbers, did these not use 2 different finals at different times? When
changing finals did they change drive components? Unfortunately I do not
have a schematic here to look around. Did anyone do any "coil spreading"?


I checked the factory service manual last night. They recommend
setting both the driver and final bias to 50 mA. That seems a bit
high, as the driver stages in many other radios are set around 40 mA.

My 2510 is set to factory specs and I've never added any "mods" to it,
and it doesn't oscillate.


Dave,

I do not have a RF VTVM or AF VTVM for the slignment. I do have a Tek 2235 scope
and freq counter. I am ordering a DMM. My friend told me instead of the VTVM,
use a DMM with a scope probe. That should work for critical voltages. If not
critical, I can use a scope. Does that sound right?

Vinnie S.