On 16-01-16 07:04 AM, 'marta_kson' via neonixie-l wrote:
They are RCA 6AH6 that appears on the market from several sources, claiming they are NOS/NIB. Are there any possibilities the blackening on the inside of the glass have been deposited as part of manufacture? On one tube in particular there are clear lines visible in the black material, as it has been rubbed off by the mica wafer when it was inserted. If so, they was clearly dark from the factory.
a quite a few tubes had a carbon coating on the inside of the glass to control static and suppress the blue glow from the electron beams.
a 12BY7 which is a similar tubes generally has such a coating, so I would not be surprised to see it here.
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