5881 Replacement for 6L6?

[Bob W5UQ]

back in my day, 5881's were used to replace 6L6's in many amplifiers.  
They worked great too in audio amplifiers.  Modulators should be very 
similar. 
Bob  W5UQ
    zzzzzzzzzzzzzz

kd4e wrote:
> Is it correct that the 5881 is shorter, more physically rugged,
> and more electrically rugged than the 6L6?
>
> Is it OK to sub the 5881 for the 6L6 in the modulator circuit
> of a Multi-Elmac AF-67?
>
> Since it is a mobile-portable rig a more rugged tube makes
> sense.  Is there a "gotcha" here that I am missing?
>
> I found this descriptive Tungsol text from 1950:
>
> "The 5881 carries ratings similar to the 6L6, except that the 
> allowable screen dissipation is 3.0 watts instead of 2.5 watts while 
> the maximum plate dissipation is 23 watts instead of 19 watts for the 
> 6L6. The tube has a low loss micanol base."
>

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