[Boatanchors] Heathkit TT-1A Restoration Article - Electric Radio

[Geoff]

While the article was a good read I believe the claim that it is a mutual 
conductance tester is in error. Hickok held the patents on those and the 
TT-1, some Jacksons, Eico 666, and a few others are "Dynamic Conductance" 
testers which simply means an AC signal is applied to the grid of the tube 
under test.

I ran extensive tests between my restored/calibrated Hickok 752A (still has 
the National Radio ID tag) and a Jackson 648S and they track very well over 
a wide range of tube types.
An I-177 and TV-7C complete the active testers here with a few other shelf 
queens or parts units.

Carl
KM1H


----- Original Message ----- 
From: "Gary H. Harmon, Jr." <gharmon at idworld.net>
To: "BOATANCHORS2 LIST" <boatanchors at mailman.qth.net>
Sent: Friday, June 22, 2012 10:25 PM
Subject: [Boatanchors] Heathkit TT-1A Restoration Article - Electric Radio


>A good friend of mine, Ron/AB5WG, wrote a great article on his electrical
> and cosmetic restoration of a Heathkit TT-1A tube tester which appeared in
> the latest issue.  Not only does it result in a beautiful specimen, the
> article goes into detail on the types of testers and the amazing
> capabilities of the TT-1A.
>
>
>
> Electric Radio (ER) has given me permission to share the article.  If you
> want a copy, let me know.
>
>
>
> Finally, ER is a wonderful magazine for those of us who appreciate the old
> stuff.  If you don't subscribe, you should consider a subscription.
>
>
>
> Vr,
>
>
>
> Gary H. Harmon, Jr. - K5JWK
>
> 6003 Archwood
>
> San Antonio, TX 78239-1504
>
> 210.657.1549h / 210.884.6926c
>
>
>
> "Too many projects, not enough time".
>
>
>
>
>
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