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@teleport.com>
To: "BEHIELS JEAN-PIERRE" <ON4AEF@base.be>; <amps@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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