Very true Carl , I was talking to a fellow on 80m last week that bought 6
4-400s for $30 a peice , ....mind you if it were me looking .........
......................................................................................................
73 VE3DV , Dave
> From: km1h@jeremy.mv.com
> To: slash_dot@msn.com; lists@subich.com; amps@contesting.com
> Subject: Re: [Amps] GI-46B in TL-922
> Date: Wed, 26 Jan 2011 16:18:39 -0500
>
> I wonder if a GU-81M would fit (-;
>
> If it was my amp and I was low on toy money Id opt for 4-400/4-500's as they
> seem available at low cost still. Same socket and filament requirements;
> just rewire the socket for all grounded grids.You could even use 4-250A's in
> a pinch. There are also EU equivalents for both types.
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "Dave M" <slash_dot@msn.com>
> To: <lists@subich.com>; <amps@contesting.com>
> Sent: Wednesday, January 26, 2011 4:06 PM
> Subject: Re: [Amps] GI-46B in TL-922
>
>
> >
> > 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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> >> >> Amps@contesting.com
> >> >> http://lists.contesting.com/mailman/listinfo/amps
> >> >
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> >> >
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> >
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