Pair of 3-500z output - well lets say 1000W into 50Ohm.
with only one 3-500 its 1/2 ... so you have 500W into 50Ohm
The impeadence of the plate at 500W is basically double that of 1000W. In turn
changes the values of the PI-net output (and input too)
The usefullness is up to you, but its alot more work to use 1 3-500Z.
You also do not need to change the filament transformer if you use 2 @
3-500Z.....
Doesn't this amp have 2 @ 3-500z originally?
Mike
KC7NOA
>
> Dr;
>
> I have from the scrap and in repair a old Kenwood TL922 amplifier.
> I will do some demonstration and technical test for a school educational
> =
> object in electronics.
> But I only have obtained one old and used 3-500Z tube.
> Question is can I made some modifications to use this old TL922 with =
> only one 3-500Z tube. =20
> I see in first order that the filaments of both 3-500z tubes are =
> originally supplied in series with a 12 VAC transformer.
> That means in first place I already have to change the filament =
> transformer into one of 5 VAC.
> But what you think about the rest of the RF-circuit should I have to =
> change also many of the values of the PI-filter network and so on.
> I really appreciate to receive your ideas around this subject and of it
> =
> is usefull to do sutch modification.
>
>
> Regards Jean OP4F.
>
>
>
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