[Amps] GI-46B in TL-922

[Carl]

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 at msn.com>
To: <lists at subich.com>; <amps at 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 at subich.com
>> To: amps at 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 at gmail.com
>> >> To: amps at 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
>> >> _______________________________________________
>> >> Amps mailing list
>> >> Amps at contesting.com
>> >> http://lists.contesting.com/mailman/listinfo/amps
>> >
>> > _______________________________________________
>> > Amps mailing list
>> > Amps at contesting.com
>> > http://lists.contesting.com/mailman/listinfo/amps
>> >
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps