>The Alpha SX had issues on 10M because of the capacitance of the two
>tubes. Also, 2x8877 is more expensive than 3x3cx800. With the 3cx800,
>the plate voltage is lower, required capacitance is lower,
** 2, 8877s at 4kV DC would have a RL of c. 1000-ohms. 3, 3cx800A7s at
2500V DC would have a RL of c. 780-ohms. For a Q of 10, Xc1would need to
be 100-ohms and 78-ohms respectively -- i.e., the 3-holer would seemingly
need more C, not less.
>voltage
>ratings of tank components is lower translating into a more cost
>effective design.
>
>Still, nothing impresses me more, at least visually, than a pair of
>4-1000's built into a cabinet with windows...
>
>Mike, W1NR
>
>
>-----Original Message-----
>From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
>Behalf Of P. Coppin
>Sent: Friday, February 27, 2004 8:29 AM
>To: Amps@contesting.com
>Subject: [Amps] 2 x 8877
>
>
>
>First of all, sorry for my poor english.
>
>I would like to know the reason why the amps manifacturers build linear
>amps
>using three 3cx800a7, 2 3cx1200a7, one 3cx3000a7 and ruskies but no one
>build a linear amplifire with 2 3cx1500a7 (8877) such as the Alpha sx.
>What problems they could have ?
>
>73
>Paul i8ixo
>
>
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