[Amps] Neutralizing Dentrons

[Tom W8JI]

>> 1.) Heath and Gonset did not make any more four parallel
>> tube amps using tubes with high feedthrough capacitance.
>> They had no reason to put it in other amps.
>
> Valid point, Tom, but Heath used the 572B in a subsequent 
> amplifier  and they chose not to use RCA's g-g 
> "neutralization" circuit.

What four tube amp was that Rich? I can't seem to recall it 
even though I did various RF designs for Heath.
Who at Heath told you they chose not to use it for the 
reasons you mentioned?