[Amps] HELP Modifications for a Kenwood TL922

[MIKE DURKIN]

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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