Looking at the specs on the tubes , I think if I were looking at doing the
conversion I would go with a single GS31b or a GS35b ( the KISS principle)
unless I already had the others, the limiter , as usual, will be the stock
power supply , but 3100v from the supply should develop 1500w comfortably in
average amatuer use
......................................................................................................
73 VE3DV , Dave
> Date: Wed, 26 Jan 2011 13:16:32 -0500
> From: lists@subich.com
> To: amps@contesting.com
> Subject: Re: [Amps] GI-46B in TL-922
>
>
> > I am curious however why the gent has changed the supior GI46
> > heatsink with 2 from the GI7B tubes
>
> He may not have changed the heatsink. From documentation on the
> tube:
>
> >> The tube can be supplied with no heat sink or with a heat sink of
> >> variant I or with a heat sink of variant II.
> >>
> >> The heat sink of variant I providing more effective cooling is to
> >> beused only when the tube is employed as an oscillator with a high
> >> average value of anode dissipation.
>
> What you describe a "the superior GI46 heatsink" is shown as "variant
> I." sounds like "variant II" is the more common.
>
> 73,
>
> ... Joe, W4TV
>
> On 1/26/2011 12:17 PM, Dave M wrote:
> >
> > The conversion of comercial amps to the russian triode is fairly well
> > documented on the net ,there a few extras that need to be addressed like a
> > new bias board and the additition of a 12.6v @5A filament transformer and
> > of course cooling...... I am curious however why the gent has changed the
> > supior GI46 heatsink with 2 from the GI7B tubes , this makes absolutly no
> > sense to me
> >
> >
> > ......................................................................................................
> >
> > 73 VE3DV , Dave
> >
> >
> >
> >
> >
> >> Date: Wed, 26 Jan 2011 11:38:29 -0500
> >> From: alex.k2bb@gmail.com
> >> To: amps@contesting.com
> >> Subject: [Amps] GI-46B in TL-922
> >>
> >> Hello everybody,
> >> I have a TL-922 amplifier and one of 3-500 tubes died - it is widely open
> >> now.
> >> Another one is still good and amp produces 400-500W out.
> >>
> >> Friend of mine gave me a link to youtube video with a slide show of TL-922
> >> converted to work with Russian GI-46B tubes.
> >> His point was that the tubes are much cheaper than 3-500's...
> >>
> >> Here are the videos:
> >> http://www.youtube.com/watch?v=FbNgQT_k80s
> >> http://www.youtube.com/watch?v=_J7nlw9If1Q
> >>
> >> What do you think of it?
> >> Is it something "even a caveman can do" or "forget about it"?
> >>
> >> One thing concerns me - none of those conversion use anode blower, they
> >> rely
> >> on original TL922's fan.
> >> I also was not able to find any schematic for the conversion itself, only
> >> the videos...
> >>
> >> thanks,
> >> Alex K2BB
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> >
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> >
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