Subsitute Tubes for T-40 and TZ-40

[Wilson Lamb]

Modern tube?  There's an oxymoron!
Seems like 811s would be about it.
You'd have to look up the gains in a tube table, but there are also 809 and 
812.
The Zs were good for class B audio, as is the 811, with zero bias.  I used 
to push my 811s to 1500V with zero bias in a modulator.  They glowed, but 
worked fine for many years.  I expect they would do the same with RF.  Just 
check linearity for good SSB performance.
Wilson
----- Original Message ----- 
From: "Joe Crawford" <crawfish at SURFMORE.NET>
To: <BOATANCHORS at LISTS.TEMPE.GOV>
Sent: Thursday, January 14, 2010 6:56 PM
Subject: Subsitute Tubes for T-40 and TZ-40


>I have some transmitter designs using the above tubes, and wonder what a
> modern equivalent is for both tubes.
>                                                                Joe
> W4AAB(new
> member)
>
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