Here's a post from way back in 2011:
Jul 7, 2011 at 6:36 AMPost #11478 of 40728
takezo
takezo
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Joined: Dec 7, 2006
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Quote:
jamesnz said: ↑
has anybody ordered/used the 6EM7 and adapter to use with their 6SE? is it worth it?
yes, i've tried it on my 6se and they are worth trying. it's essentially a 6gf7a in an 8-pin octal base.
(the 6gf7a is 9-pin noval base) the output plate resistance is only 750 Ω, very low compared to
other compatible tubes for the 6se, and SQ is very nice. the grid voltage operates at a much lower
point than what the 6se is designed for but it's still within operating voltage, just not optimal. if you're
a diy person then changing it is not difficult, but not recommended if you plan to tube roll other
types. personally, i think it sounds fine even at the outer ranges of its operating voltages.
try to get box-plate construction instead of the more common flat-plate, as the former presents
a more balanced/coherent sound. i prefer the 6gf7a mainly because they are much cheaper to the 6em7.