5881 Replacement for 6L6?

Bob W5UQ W5EUQ at VERIZON.NET
Mon Nov 5 22:03:12 EST 2007


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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