[BC] Re: All American Five

[Phil Alexander]

On 9 Jul 2005 at 11:07, R J Carpenter wrote:

> The all-american five had OCTAL tubes, not those ity-bity 7-pin
> minatures.  I never saw one with loctal tubes - would have been Philco
> I assume. The Philco on my shelf here in the shack was my aunt's,
> bought around 1940/1.  It has octal tubes and a real wooden case.  It
> would probably be more of a colelctor's item if it were of the right
> plastic.

Right about the Philco. They and Moto used Loctals. I don't know of anyone
else using them. But tell me, what tubes were used for the octals to
add up to 120 V for a series string filament circuit?

I don't think I ever saw an octal set without a power transformer and
6.3 V parallel filaments, and one of the main characteristics of an AA5
was series filaments and rectified line voltage to give 135-150 V B+.


Phil Alexander, CSRE, AMD
Broadcast Engineering Services and Technology 
(a Div. of Advanced Parts Corporation) 
Ph. (317) 335-2065   FAX (317) 335-9037





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