[Johnson] My poor sick Viking II

[Roy Morgan]

At 12:46 AM 1/13/04 -0700, KENNETH A CRIPS wrote:
>... as I approached the tuning peak the meter started to slowly raise. ... 
>I noticed a increasingly loud buzz, and at the  same time
>one of the 6146's started to arc inside and with in a second or two the fuse
>would blow.
>
>Do any of you have any ideas what is going on here.

Here are some possibilities:

Parasitic oscillations.
Weak bias supply.
The modulator is oscillating at an ultrasonic frequency.
The loading capacitor is heating up.

Roy



- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
7130 Panorama Drive, Derwood MD 20855
Home: 301-330-8828 Work: Voice: 301-975-3254,  Fax: 301-948-6213
roy.morgan@nist.gov --