[Hallicrafters] SX-99

[john]

Robert,

I'd not think that soft tubes would have any effect on drift,
and the only Rs and Cs that should affect VFO stability would be in
the voltage regulation (if any) and the VFO itself. 

I find most mid priced receivers of that era are going to drift in a smiliar
fashion and rate, for the first half hour. I made the mistake of taking 
a 7 watt "Hot stick" heater out of my SX101 that was placed there by
the factory to continually trickle heat into the vfo circuitry to minimize the
"first turn on" drift. It was wired across the line, BEFORE the AC switch
and was thereby always on. The thing drifts like crazy for the first hour
now without this heater! Its going back in, the next time I  have it on the
bench.

Good luck!
John wb5oau


At 06:17 AM 1/4/03 -0600, Robert M. Bratcher Jr. wrote:
>
>At 11:09 PM 1/3/2003 -0500, you wrote:
>>1. Have you tested the tubes and/or replaced any?
>
>No, never needed to.
>
>>
>>2. Has the set been properly aligned within the past four years?
>
>No.
>
>>
>>3. Have you checked the resistors for being within tolerance and 
>>capacitors for
>>proper capacitance?
>
>Again no. The set plays just fine as is. I just wondered about it's warm up 
>time. Thanks for your answers though...
>
>
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