Yep. Correct on all counts.
Alek.
At 09:27 AM 27/01/2011, Carl wrote:
>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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