[Amps] HELP Modifications for a Kenwood TL922

Carl km1h at jeremy.mv.com
Tue Jan 26 12:21:29 PST 2010


A. A new 3-500Z costs around $150

B. The grids are not grounded in a TL-922.

C. I dont think there is top clearance for a 4-400

Carl
KM1H


----- Original Message ----- 
From: "Colin Lamb" <k7fm at teleport.com>
To: "BEHIELS JEAN-PIERRE" <ON4AEF at base.be>; <amps at contesting.com>
Sent: Tuesday, January 26, 2010 2:50 PM
Subject: Re: [Amps] HELP Modifications for a Kenwood TL922


> Hello Jean:
>
> I see the problem as follows:
>
> You got an amp that uses two 3-500 tubes, but you only got one 3-500 tube. 
> An additional 3-500 tube would cost more than the amplifier and you want a 
> cheap solution.
>
> You can use two 4-400 tubes ore even 4-250 tubes and should be able to 
> trade one 3-500 for two of those tubes.  In Europe, there are QBL 
> equivalents to the 4-250 and 4-400 tubes.  The tubes will fit in the 
> sockets.  These tubes are tetrodes, but the socket will ground both the 
> screen and the control grid.  These tubes like higher voltage and will not 
> run as much power - but they will work.
>
> 73,  Colin  K7FM
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