As this group has a deep understanding and waste knowledge of hollow state devices, I would like to ask for an opinion about the state of those tubes pictured in the link below.
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. Nevertheless, it's a foreign matter present inside the tube. Are there any reason to belive they are of inferior quality? Unfortunately I have no tube tester, but listening tests on a receiver with those as RF and first mixer gives an impression they offer more noise and less amplification. I don't trust my own judgement there, as knowing what is in the sockets definitely puts on some bias... Please give me an opinion and maybe an explanation of the darkening other than deposited cathode material. It will be greatly appreciated. Thanks in advance for any advices. <http://www.martakson.se/scratch/rca_6ah6_dark_tubes.jpg> -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/5c6e72f3-6421-4558-afd6-80a49499d636%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
