[Amps] 2 Tubes in Parrallel:

[jeremy-ca]

This has been covered any number of times and is archived.

In a few words: Handbook obsession with a Q of 12 is meaningless. If you 
notice the circuits used by many manufacturers over the years they all use 
the same components across several models.

With the low output C of the 8877's there wont even be problems getting 
enough Tune C at 10M to give good efficiency.

Carl
KM1H


----- Original Message ----- 
From: "Bruce Osterberg" <n9bx at mchsi.com>
To: <Amps at contesting.com>
Sent: Thursday, November 08, 2007 7:59 PM
Subject: [Amps] 2 Tubes in Parrallel:


>
> From What I read when you have two tubes in Parallel, Like two 3-500
> the RL is 1/2 of what it would normally be if one tube was used.  Since
> the good people at Ameritron have shown us the schematics for the Al-84,
> (2-3550), al-1200 and al-1500.  I wonder why all of the same components
> are used in both AMPS?  Like Tank circuit and Capacitance Values.  Does
> this not effect the operating Q of the final Tank circuit?
>
> I only ask this in hopes that someone could shed some light on my quest
> to build a 2 x 8877 Amp.
>
> If I had 3600 Volts on the Plates of Two tubes, and figuring 1.82 x 1.5
> amps that should give me a RL of 1318.  Or 1300.  Should I design my
> Tank circuit for that value?  In everything I read this is Correct.
> Please give me your thoughts.
>
> 73 Bruce N9BX
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