Neutralization tips for TX-1 Apache Needed
 

The manual is rather sparse on this, and I was wondering if anyone out
there has any hints or kinks that will aid in neutralizing the Apache
TX-1 final stage. A brief description of the process would be great,
as the manual doesn't seem to directly address it.

Also, the previous owner seems to have doped (red colored) the final
ceramic tube sockets and the solder lugs, and capacitor leads; Good
idea? (The dope seems to be flaking/failing in some places.)

Thanks to the group,

Lin/KJ6EF
For email responses, remove "nospam_".

The procedure to neutralize an amp is pretty universal.

The purpose is to cancel the feedthrough RF from the driver via the Cg-p
capacitance.

Disengage the B+ to the PA (plate and screen for tetrodes/pentodes),
but keep the plate tank connected.

Transmit into a dummy load with power meter inline.

Adjust neutralization cap until tuning the plate tank circuit through its
range causes absolute minimal or no output.

Unit is now neutralized and B+ can be reconnected to the PA and you are
ready to rock!

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca