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

[Charles Ring]

My Weston 798 Type 5B, dated 1951, is called a "Proportional Mutual 
Conductance Tubechecker" in the title of its manual. The nameplate 
simply says "Vacuum Tube Testing Equipment".

I am still looking for updated (anything after 1951) tube charts for it. 
It does not use a roll chart.

73 de W3NU



On 6/23/2012 0954, Geoff wrote:
> 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
>
>