5881 Replacement for 6L6? - CORRECTION 6L6GB

Richard Post postr at OHIOU.EDU
Sun Nov 18 18:50:21 EST 2007

Hi Doc,

I would definitely use the 5881 pair.  The RCA RC-19 tube manual 
gives the 5881 a somewhat greater maximum rating in both plate volts 
and watts but for "typical operation" and "average plate 
characteristics" the reader is referred to 6L6GB.

I'm told that the 5881 is a milspec 6L6GB.

The 6L6GC is the next generation and has even higher maximum ratings. 
Think of the 5881 as a slightly beefed up 6L6GB and the 6L6GC as a 
major step up.


At 4:22 PM -0500 11/18/07, kd4e wrote:
>Just looked at the specs for my Multi-Elmac AF-68 (chose
>the AF-68 instead of the AF-67, swapped the AF-67 for a
>PMR-8) and observed that the modulator tubes are 6L6GB's
>rather that the metal 6L6.
>Why would they have chosen glass vs metal?
>Modifying my original question a little:
>If the AF-68 is designed for the 6L6GB which of the
>following are likely to be acceptable & which better
>than than the 6L6GB in the AF-68 (it will be both base
>and portable so resilience to vibration is valuable)?

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