[Drake] 6JB6A tubes for Drakes

[John King]

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  

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