Question(s) on GE 7027a tubes

Posted by JamesNW (A) on May 9, 2015 at 05:57:33

Inmates;

I have been running a tube 'something or other' for 50+ years now and in the time have been slowly collecting tubes that interest me.

I occasionally sort and inventory tubes and in doing so recently found I had exactly two quad (eight total) GE 7027a tubes. I like the 7027a in my Mac MC240 as it has (to my ears) a more solid base signature and seems expanded through the whole range. I usually run RCA's but obviously asquired these GEs along the way.

I am fairly certain that no more than any two of these were acquired together but each and every one is showing a fair amount of gettering dissipation (dual side getters). Has anyone seen a situation where GE tubes don't age as well as others?

All tubes test fine in my simple tester (Superior Instruments TD-55) but I recognize it is not the last word in test equipment. Obviously a disappearing gettering is not desirable but assuming the tube tests fine otherwise is it 'wise' to use it?

Finally, is there someone recommended in the community who offers excellent tube testing services? These are of high enough value to me that I would like to have them seriously tested by someone in the know with serious equipment.

Thanks you

James

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Topic - Question(s) on GE 7027a tubes - JamesNW 05:57:33 05/09/15 (2)

RE: Question(s) on GE 7027a tubes - Triode_Kingdom 20:46:56 05/09/15 (0)

RE: Question(s) on GE 7027a tubes - TubeAcolyte 06:46:15 05/09/15 (0)

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