[Drake] 6JB6A tubes for Drakes

[Garey Barrell]

John -

I have never been able to get an "International" brand 6JB6 to work in a 
transmitter.  They probably work just fine at 15 kHz, but not much higher!

Don't know about the Lafayette brand.  RCAs work fine.

I stick with Sylvania, Zenith (apparently made by Sylvania, judging by 
their construction,) RCA and last choice GE.  The RCA and GE work ok, 
but seem to lose their "newness" (~10% reduction in output power) much 
faster than the Sylvania/Zenith. 

Westinghouse and Raytheon tubes also do NOT work.

73, Garey - K4OAH
Atlanta

Drake C-Line Service Manual
<http://www.k4oah.com>



John King wrote:

>I have some NEW 6JB6A tubes that are branded
>International Service Master. The boxes say "country
>of origin marked on tubes". The tubes have no visible
>markings regarding country of manufacture.
>
>Does anyone know who manufactured the International
>brand of Service Master tubes? They are in Blue and
>White boxes.
>
>They appear to be the "short" variety of sweep tubes
>as opposed to the taller brands.
>
>If anyone knows or has experience with the
>International tubes as final amplifier tubes in the
>Drakes, I would appreciate your input.
>
>I also have Lafayette brand 6JB6A tubes as wellas RCA
>tubes. Your knowlege of the Lafayette brands will also
>be appreciated. 73, John, K5PGW  
>  
>