[Amps] Weird tubes in an amplifier

[Carl]

They were designed for Class B audio AND RF and have very low distortion. 
However the mu is only 12 so they take a bit of drive.

As a grid driven SSB linear run them as with any other tube that has a 100W 
plate dissipation.

Carl
KM1H


----- Original Message ----- 
From: "k7fm" <k7fm at teleport.com>
To: <amps at contesting.com>
Sent: Wednesday, January 29, 2014 12:15 AM
Subject: Re: [Amps] Weird tubes in an amplifier


>
> On 01/28/14 7:24 PM, Mark wrote:
>> Just when I thought I had heard of almost every type of tube in an 
>> amplifier, I talked to a ham that has 2 VT4C's in an older home brew 
>> amplifier he has for sale.
> The VT4C is aka the 211.  They have 100 watts of plate dissipation each. 
> Filament is 10 volts at 3.25 amps.  Maximum frequency ratings of 15 MHz 
> (whoops mc for that vintage).  They were often obtained surplus from the 
> BC-375.
>
> My opinion is that they are a terrible tube for a linear amplifier. There 
> are a number of triodes that can replace it, however these group of  tubes 
> have been bought up by audiophools, who think these triodes put out better 
> notes than other amplifier devices.
>
> You can substitute a pair of 805 tubes, but they have also increased in 
> price.  It might make a nice AM final amplifier, but may need some work 
> for a linear.  You could trade out the tube sockets and filament 
> transformer and use almost any triode.  Two 572B tubes would work
>
> In short, you can make it work on the low bands - but why?
>
> 73,  Colin  K7FM
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