[Premium-Rx] HP8640B

[Carcia, Frank A. HS]

> 	hi All,
> 	I just bought a broken HP8640B off Ebay.
> 	There appears to be a problem with the Cavity.
> 	The output drops very low after it has been
> 	on for a while. I have the procedure for setting
> 	the two levels. I wonder if anyone has ever 
> 	taken one apart or ever seen this problem.
> 	The power supply voltages appear normal.
> 	I wonder if there is a feedback probe 	adjustment and the
> transistor type used 
> 	in the oscillator. This was to be a hanger 	queen but looks
> clean with no cracked gears.
> 	It is the early model with wafer switches.
> 				TNX,
> 				fc