5881 Replacement for 6L6? - CORRECTION 6L6GB

kd4e doc at KD4E.COM
Tue Nov 20 09:42:49 EST 2007

Turns out that the guy from whom I acquired my AF-68
runs 5881's in his and is pleased with the performance.

Note:  The original spec is 6L6GB's.

I am guessing that a pair of 6L6GC's would run longer
as the HV stress is lower.

I also see a 7581/A shown as a super-substitute.

The 7581/A tube is an industrial strength version
of the 6L6GC which is also said to be the American
equivalent to the British KT-66.  The ratings 7581
are roughly the same as the 6L6GC while the 7581A
has higher ratings.   The 7581 has a plate voltage
rating of 500 V--35 watts (5   watts more than the
6L6GC) and a screen rating of 450V--5 watts.  The
Philips/ECG 6BG6 that we have were made from
Philips/ECG (Sylvania) 7581A parts and have the
same ratings as the 7581A.
Source: http://www.vacuumtubes.com/6l6.html

One may often use Philips/ECG $8. 6BG6 tubes as a direct
replacement for 6L6GC's in lots of gear - IF you have
the extra height available:

> Here are main electrical differences between the 6L6 family of tubes.
> 6L6GC - 500 volts max
> 6L6 - 375 volts max
> 6L6G, GB, 5881 - 360 volts max
> 1614 - 550 volts max
> Source - NJ7P Tube Database Search
> 73, Dave N7RK


Thanks! & 73, doc, KD4E
Personal: http://bibleseven.com/kd4e.html

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