[Central-Electronics] Your thoughts on the 20A .....

[George Maier]

Except for one minor problem, Rolynn, the caps have aged another 50 years by
now, and the old carbon resistors are all the more noisy.  
After listening to complaints about my drifting regardless of the warm-up
time, I started checking the old square mica and paper tub type bypass caps
on a Sprague TO-6, and found them to be very leaky.  They may all be that
way, but the odds are that their life span is seriously compromised right
about here. Once the re-cap job was done, none of the YeaComWood crowd ever
complained again! 
Your mileage may vary!
73 - George, K1GXT

-----Original Message-----
From: central-electronics-bounces at mailman.qth.net
[mailto:central-electronics-bounces at mailman.qth.net] On Behalf Of ROLYNN
PRECHTL K7DFW
Sent: Tuesday, June 20, 2006 11:24 PM
To: central-electronics at mailman.qth.net
Subject: Re: [Central-Electronics] Your thoughts on the 20A .....


> As for the VFO's I have several of the BC-458 variety, and have found that
only way to really tame down the drift requires total replacement of all
passive components, and moving a few things around, like that big resistor.
===============================

No need to reinvent the wheel.

During the late '50's a bunch of us ran 20A's with 458's and the solution
was to leave the VFO plugged in with the filaments running 24 hours a day.
Had no problems and no drift.


K7DFW


..._._

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