[Amps] 4x813`s in GG

[Carl]

The 813 is well underated. Most will hi-pot with plenty of overhead for 3KV 
on AM.

The 572B is simply a 811 with a graphite anode and runs fine at 2500V in 
lots of commercial ham amps.

Carl
KM1H


----- Original Message ----- 
From: "Fuqua, Bill L" <wlfuqu00 at uky.edu>
To: <dezrat1242 at yahoo.com>; <amps at contesting.com>
Sent: Monday, July 27, 2009 4:18 PM
Subject: Re: [Amps] 4x813`s in GG


>A  good example of running tubes over the published Plate voltage limits is 
>the E.F. Johnson Viking 500 plate modulated AM transmitter.
> The final tube 4-400 and the modulator tubes 811A's were run with 2kV on 
> the plates.
>
> 73
> Bill wa4lav
> ________________________________________
> From: amps-bounces at contesting.com [amps-bounces at contesting.com] On Behalf 
> Of Bill, W6WRT [dezrat1242 at yahoo.com]
> Sent: Monday, July 27, 2009 2:30 PM
> To: amps at contesting.com
> Subject: Re: [Amps] 4x813`s in GG
>
> ORIGINAL MESSAGE:
>
> On Mon, 27 Jul 2009 18:38:35 +0100, jonathan white
> <jonathan.white20 at btinternet.com> wrote:
>
>> Anode volts will be around 2,800 volts
>
> REPLY:
>
> You probably can get away with it, but the manufacturer's data sheet says 
> 2500
> VDC is the max allowed. There probably is a little cushion there but I 
> wouldn't
> push it too far.
>
> 73, Bill W6WRT
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