[ARC5] 7V and 14V Tubes

[Geoff]

Since Loktals were effectively dead in development   by 1948 and new 
equipment designs shortly after it made sense to finally bite the bullet and 
conform.and save print space in the spec sheets.


----- Original Message ----- 
From: "Mike Morrow" <kk5f at earthlink.net>
To: <arc5 at mailman.qth.net>
Sent: Monday, April 30, 2012 11:58 PM
Subject: Re: [ARC5] 7V and 14V Tubes


> Wayne wrote:
>
>> Actually the Loctal Tubes with 7V and 14V filaments were indeed meant for
>> 7V and 14V filament voltages...
>
> Geoff wrote:
>
>> Loktals are listed at 7 and 14V nominal in Sylvania listings and 6.3 and
>> 12.6 as acceptable. Sylvania was the developer.
>
> AFAIK, only Sylvania claimed that loctal filaments were nominally rated 
> for 7.0
> or 14.0 volts, rather than 6.3 or 12.6 volts.  That is reflected in the 
> 1951
> Sylvania tube data manual.  But sometime before the publication of the 
> 1959
> Sylvania tube data manual, Sylvania appears to have abandoned this 
> pretense.
>
> See these documents at 
> http://www.tubebooks.org/sylvania_tube_manuals_online.htm
>
> A claim that loctals used 6.3 and 12.6 volt filaments seems to be the 
> position
> that is best supported by even Sylvania's own manuals, at least by 1959.
>
> Not that it ever made much difference!
>
> 73,
> Mike / KK5F
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