[Johnson] on cleaning tube sockets and pins

[Mark Foltarz]

I am ressurecting a Viking Invader 2000. It is coming
back to life reasonably well. Almost ready to pop in
the 4-400's and burn the house down.

I had to replace a rectifier and a couple of
electrolytics  in the exciter supply.  

The balance of the orignal electrolytics  all formed
such that each draws no more than 2 MA @ 450 DC. Not
bad for 40 year old firecrackers!

Some crud managed to get in the threads of a couple of
the padders in the driver tank. I have cleaned the
threads of the trimmers and have good output in the
various modes. Sure is a lot easier than adjusting a
phasing rig!

Dirt or oxidation had gotten into a couple of tube
sockets and this made the output unstable. 
Eventually, alignment of the various stages yielded
good results - I just had to periodically wiggle a
mixer tube.

Thus, the most trouble I am having is related to
intermittant connections on the various 7 & 9 pin
tubes. 

Any body have any "sure fire" tricks on cleaning tube
sockets and pins of minature tubes? 

TNX
de KA4JVY
Mark

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