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Old 13th March 2003, 02:40 AM   #11
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TO-3p and TO-247
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Old 13th March 2003, 02:42 AM   #12
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Thanks jackinnj
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Old 13th March 2003, 05:34 AM   #13
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Default TO-3

Well I.ve used TO-3s but not TO-247. The reason Im asking is that Im planning to replace my amps output transistors which are 2n3055 to to-247 transistor (maybe 2sc5200 or c3281) for better power handling and heat transfer since to-247 have impressive datasheets. However now im hearing that to-3s are still a choice when thermal management is an issue.

Maybe i should just use mj15003 or mj15024?
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Old 13th March 2003, 07:26 PM   #14
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Quote:
In terms of heatsinking, TO-3 is better (for the same amount of dissipated power/heat). But in all cases I found, the equivalent TO-247 package produces better sound.

Did you realize, that not just the case of most TO3 is magnetic, but also all base and emitter pins.
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Old 14th March 2003, 01:56 AM   #15
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Quote:
Did you realize, that not just the case of most TO3 is magnetic,
OMG!! MAGNETIC! RUN FOR THE HILLS!!!

There is something sexy-cool about TO-3 devices that the plastic devices are lacking in, regardless of sound (or magnitism...lol!)

Certainly sound quality must be first on the list when designing something, but asthetic considerstions also count. And there are few things prettier than a pile of paralleled TO-3 devices on a hefty heatsink out there for all to see.
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Old 14th March 2003, 03:30 AM   #16
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...Except tubes glowing in their All-Mighty (see God Of Triodes ) Greatness.

Face it. Cold steel can't compare with hot tungsten and clear glass, especially that dusted in a haze of blue glow.

Tim
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Old 14th March 2003, 03:48 AM   #17
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--TO-3 or TO-247?

What is a good rule of thumb
for determining how many TO-3's
you need vs. TO-247 when paralleling
output stages.

Example,

suppose a design calls for 8
TO-247 packages paralleled,
but you found the same part
in T0-3 case, how many TO-3's
would you use now to be
equivalent in heat dissipation
to the 247 package.

The reason I ask is;;;

There are some manufacturers
who brag about T0-3 package usage
in their amplifiers but they don't use
that many in the design whereas a
similar amplifier design may use more
247 packages.
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Old 14th March 2003, 04:33 AM   #18
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"how many TO-3's would you use now to be equivalent in heat dissipation to the 247 package."
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Personally, I would consult the particuluar device specs to see what its capable of. In theory though you should be able to use the same number of either style device.....
Mark
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Old 14th March 2003, 04:35 AM   #19
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"Face it. Cold steel can't compare with hot tungsten and clear glass, especially that dusted in a haze of blue glow."
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Actually my Aleph 2's have a wonderful blue glow inside them that your tube amps could never equate to.......
Mark
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Old 14th March 2003, 04:40 AM   #20
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Well, yeah. Anything that hot is going to glow!
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