[Amps] The maximum amount of 811As and 572Bs in parallel

[R L Measures]

On Jul 23, 2006, at 11:37 AM, crawfish wrote:

> I have an article using 6 of the 811A's in parallel for 160 meters  
> from 73
> Magazine, early 1980's. I would imagine the output capacitance of  
> more than
> 4 would be too much to tune the plate circuit on say, 15 and 10  
> meters.

If the number of tubes doubles, RL is divided by two, the amount of  
Tune-C needed doubles to main the desired Q, so adding more tubes  
only increases the drive and filament requirement.

>                                   Joe W4AAB
> ----- Original Message -----
> From: "Hsu" <Jbenson at sohu.com>
> To: <amps at contesting.com>
> Sent: Sunday, July 23, 2006 6:05 AM
> Subject: [Amps] The maximum amount of 811As and 572Bs in parallel
>
>
>> Hi,
>>    I have seen some schematic diagram of amplifier, I found that the
> amount of 811As and 572Bs no more than four, Coud someone can tell  
> me how
> much  maximum amount of the tubes in parallel?
>>   Thanks!
>>         73! Hsu
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>
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R L MEASURES, AG6K. 805-386-3734
r at somis.org