[Amps] "10 Meter Ban" to be lifted ...

[dcoffman at iquest.net]

Harold,

My apologies, I was under the impression that a single 8877 with the 
appropriate power supply would produce 1.5KW easily and over 2KW PEP.  I 
assumed that 2 X 8877 would be way over that, again with the appropriate 
supply.

That answers my question, that 2 tubes in this amplifier would yield legal 
limit.  Without that understanding, I couldn't figure out why one would take 
the time and cost to add a second expensive tube if you already had all you 
could use.

Thanks for your reply,

Doug - N9XTF

Quoting Harold  Mandel <ka1xo at juno.com>:

> Once again, depending upon the transformer edition the anode ampacity would
> vary.
> 
> The two-tube model was supposedly able to supply two amperes, but if you
> look at what a real
> two amp transformer looks like compared to the Hypersil edition that Alpha
> claimed could run
> two tubes you would see a marked difference.
> 
> Again, one 8877 will not produce 2500 watts, Doug.  
> 
> Using two tubes will crank 2KW out of the vanilla 77Sx, but barely.
> 
> It was a question of voltage sag with the key down.
> 
> PWD offers three different in-box xfmrs for '77's and none of them
> will crank much more than 2KW out of a two-tube 77Sx.
> 
> Hal 
> 
> 
> Ok, would they be able to supply the anode current for the additional tube?
> 
> What would be the point in a second tube in an amplifier that would already 
> surpass legal limit?
> 
> 
>