[ARC5] BC-230 / -430 "Four Pin Tube Bases" Not Needed.

[David Stinson]

----- Original Message ----- 
From: "J Mcvey" <ac2eu at yahoo.com>
Subject: Re: [ARC5] BC-230 / -430 "Four Pin Tube Bases" Not 
Needed.



> I like the idea of non-destructive "souping up" of these 
> transmitters.
> In an effort to understand the retrofit I looked up the 6aq5 
> tube chart.
> I see that it has a plate resistance of 57K, whereas the the 
> VT25 (10) has a plate >resistance of around 5K

I never look at that kinda stuff.  I ain't smart enough for it.
I say:  "this tuble looks like it should work and it's cheap!"
I plug it in and tweak on it until it works or it doesn't.

.> The 6sn7 and 12au7 have plate resistances around 7K .
>Couldn't you increase the power by running these triodes
> in parallel?

Give'em a try!  I dunno about 12AU7s at 330-350 volts
but there's plenty of them around.
Let us know what you find.