I thought the "good" 46 cooler was finned as in the 8877, etc wheras the 7B
can be fan cooled horizotally.
Neither one looks to be an easy conversion.
Carl
KM1H
----- Original Message -----
From: "Alek Petkovic" <vk6apk@bigpond.com>
To: <amps@contesting.com>
Sent: Wednesday, January 26, 2011 7:48 PM
Subject: Re: [Amps] GI-46B in TL-922
> that's right. The heatsinks are interchangeable but the 46 tube is
> substantially bigger than the 7.
>
> The GI46b is more often sold without the cooler as they seem to be
> more plentiful like that. They are definitely much cheaper that way.
>
> Maybe the suppliers of the GI46B's have previously sold the coolers
> to people who use them to cool the GI7B's more efficiently.
>
> The person who did the conversion in the pictures, probably bought
> the tubes without the coolers and just plonked the GI7B coolers on.
> They are a perfect fit, with no modification required. However, as
> has been said here, they are nowhere near as efficient as the proper
> GI46B cooler.
>
> 73, Alek.
>
>
> At 06:26 AM 27/01/2011, Roger (Sub1) wrote:
>>On 1/26/2011 1:16 PM, Joe Subich, W4TV wrote:
>> >> 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:
>> >
>>Looks like they won't fit the sockets for the regular GI7B either.
>>
>>73
>>
>>Roger (K8RI)
>> >>> 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
>> >>> _______________________________________________
>> >>> Amps mailing list
>> >>> Amps@contesting.com
>> >>> http://lists.contesting.com/mailman/listinfo/amps
>> >>
>> >> _______________________________________________
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