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Old 30th January 2013, 09:39 PM   #101
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I meant 6j11p, had a look around and they seem to be the same thing. They are listed as an ef180 type and to me look very like a higher dissipation (4.9w) 6j9p, with higher heater current. The anodes look just like 6j9p-e's ie tanks! If thats the case they should be well worth looking at!

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Old 30th January 2013, 09:53 PM   #102
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Indeed they are built like a tank. I've seen them listed as E280F equivalent also.

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Old 9th May 2013, 05:54 AM   #103
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Default GM70 C3G/6B4G

I did try C3G triode as input/driver tube (gain about 42) to the interstage xformer but I did not like the sound, compressed, loss of dynamic, still not bad sounding for SE amp. With C3G (triode) as input and 6B4G as driver/interstage the sound is more powerful, more dynamic, the sound is satisfying.
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