[Amps] HELP Modifications for a Kenwood TL922

[Alek Petkovic]

Download the manuals of the AL80B and the AL82 from the Ameritron 
site and compare the input and output circuit values and/or part 
numbers. There may be some clues there.

Apart from that, it seems to be a really terrible thing to do to an 
amplifier. Why do you want to butcher it like that?

73, Alek
VK6APK


At 11:13 AM 27/01/2010, on4aef at base.be wrote:

>  It is not a question of money or to put some other types of tubes.
>   It is a question of using only one 3-500Z in this amplifier and what I
>have to change to realise this not more !
>   Of course I have to change the filament transformer into a 5VAC version
>because originally both 3-500Z's are in series on 12VAC !!
>
>   Regards Jean ON4AEF.
>
>
>
>
>On Tue, 26 Jan 2010 14:20:24 -0800 (GMT-08:00), Colin Lamb
><k7fm at teleport.com> wrote:
> > "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"
> >
> > The ham raising the question was not in the US and tubes may be more
> > difficult and expensive there.  The fact that the writer was willing to
>put
> > in a new filament transformer to run one tube rather than two implied
>that
> > purchasing a replacement 3-500Z tube was not an option.  I do not know
>his
> > finances, but I have been in countries where $150 is a years income for
> > some.
> >
> > No, the grids are not grounded directly, but pins 2,3 and 4 can be
> > strapped together and will work.
> >
> > I thought the 4-400 is the same height as the 3-500Z.  I have
>substituted
> > directly in the SB-220 with no problem.
> >
> > Colin  K7FM
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