[Boatanchors] When to use neutralizer capacitor

[sr2000 k9axn]

John,

Part 1.  The grid plate capacity for the 6146 or any tube could need 
neutralization under certain conditions.

Part 2.  If it's on a different frequency, itself the doubler etc--- no need 
but if it's modulated linearity would benefit from neutralizing.

Part 3.  If there's a tank on the input that is tuned to the same frequency 
as the output, TGTP, absolutely.

For a comprehensive explanation of Neutralizing grid driven amplifiers see:

Part 1:   https://www.k9axn.com/_mgxroot/page_10873.html
Part 2: 
https://www.k9axn.com/attachments/Neutralizing_concepts_part_2_word_3262017_E_3312017.pdf

Kindest regards Jim K9AXN

-----Original Message----- 
From: John Saxon via Boatanchors
Sent: Saturday, July 22, 2017 12:31 PM
To: BoatAnchors QTH
Subject: [Boatanchors] When to use neutralizer capacitor

Excuse my ignorance here, but I am in need of some consulting.
I would like to build a 6AG7-6146 transmitter.  As I research around I see 
some 6146 PAs that have the neutralizing capacitor and some do not.  So I 
have not been able to figure out when a neutralizing cap must be used.
I am guessing that the following are possible factors:1. grid-plate 
capacitance of PA tube2. PA on same frequency of OSC, or not3. Whether or 
not there is a tank circuit in the OSC
So I would appreciate some comments from you gurus out there, or perhaps a 
pointer to a good description.  I have been doing reading, but am still 
confused (not the first time that has happened).

Any and all information greatly appreciated,JohnK5ENQ
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