6EJ7's vs. 6JC6A - diyAudio
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Old 2nd September 2013, 01:38 PM   #1
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Default 6EJ7's vs. 6JC6A

Good morning everyone,
Any reason I should not use a 6JC6A in place of a 6EJ7?


Thanks,
Ray
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File Type: pdf 6EJ7.pdf (87.9 KB, 22 views)
File Type: pdf 6JC6A.pdf (330.2 KB, 16 views)
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Old 2nd September 2013, 02:28 PM   #2
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They are very similar, but 6jc6 appears to lack the internal shield to pin 6???
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Old 2nd September 2013, 03:47 PM   #3
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6EJ7/EF184 datasheet with plate curves:
http://frank.pocnet.net/sheets/030/e/EF184.pdf

Looks like 6JC6 is a bit sharper cutoff toward the knees, and 6EJ7 has 2X the plate resistance.
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Old 2nd September 2013, 07:43 PM   #4
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I used the 6JC6A in one of my early amps, as it was one of the better performers in Pete Millett's pentode shootout. I had no complaints. I don't remember if the 6EJ7 was on his short list as well, but I've gotten a bunch on spec and will end up using them one day. The 6EJ7 is supposed to make a nice triode when strapped for it. The varieties with the mesh shield also look good.
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