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forthharmonic 14th January 2011 09:12 PM

6AC7EH Better but different
 
A few days ago I revived four matched 6CA7EH although they were not perfectly matched and needed careful set up . They are a pleasant surprise.

On the test bench they were able to handle 145 ma cathode current
without complaint (493 Vdc).

This is not a recommended test. I am hoping to build a data sheet as none is forthcoming form EH

They tested very linear and have a sparkel that is refreshing .They replaced EL34Ls from a well know supplier that I will not hurt for no reason.

I can recommend them to anyone wanting a more flat 5khz to 30khz.

Performance of couse is dependent on many other amp considerations.

I was able to log 10hz to 40Kz -3db at 15 Watts

I hope this helps

David


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