[Amps] Amplifier output power delivery ....

[Kevin]

The 87A uses 3CX800A7 triodes.

It's my opinion that the Tl-922 suffers from an inferior power supply 
design. The 87A is vulnerable to PIN Diode burn out and the 3CX800A 
triodes can't stand any mistuning mistakes. A pair of 3-500ZG's will 
take 100 Watts of drive and about 3500V dc on the plates to hit the US 
legal limit. An un- modified TL922 won't do that. The 87A will do it 
with 50 Watts or less of drive but you better watch the grid current.

You can replace a pair of 3-500ZG's three times for the cost of one 
3CX800A7.

On 9/24/2016 12:48 PM, jeanpierre.behiels at engie.com wrote:
> Hi members;
>
> Is there a real power output difference between a old Kenwood TL922 amplifier and a Alpha 87A automatic tune amplifer.
> I now the TL922 use 3-500Z graphite tubes as finals,and the Alpha 87A 4CX800 finals I think ?
> Witch type of amplifier receive your preference .... ?
>
>
>
> Regards Jean ON4AEF.
>
>
>
>
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-- 
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441


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