[R-390] Leary Super Pro Article

[Tim Shoppa]

Perry wrote:
> Here is a summary of the fabled “Souping up the Super-Pro”
article.  Basically it’s a bust.
> (1)  The super pro’s shown were sp-400’s which he dis-assembled,
cleaned, put on a new chassis and
> used peanut tubes instead of octals.
>
> (2)  A third IF is added by using a BC-453’s 85 kHz IF
transformers.
> 
> (3)  Added were: A product detector, fast and slow AGC circuits, 6AB6
tubes (Current price $35
> each!) to the RF stages and an antenna trimmer.  Somewhere I read
that he added an additional
> voltage regulator.
>
> (4)  No schematics shown, but he’d mail them to you.  Since he’s
SK, we go fish.

6AB6 tubes? I'm 99% certain that this is a typo for 6BA6. A 6AB6 is a
clever but dead-end double-triode-direct-coupled audio output tube.

Tim.