On 2014-01-29, at 12:15 AM, k7fm wrote:
>
> 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
Hi Colin,
Those 211 tubes are lusted-after by the vintage radio transmitting crowd, too.
A coupla years ago I built a 2x211 Colpitts self-excited transmitter for use in
one of the Antique Wireless Association events (i.e. "The 1929 QSO Party")...
It sure did have a VERY unique note / tone, bar none...! And it was an absolute
blast to see those big ol' jugs light-up, too...
~73~ de Eddy VE3CUI - VE3XZ
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