I can't resist starting this debate over, however I am looking for firsthand experience . I am looking for insite to use mica/silpad and with which goop for insulating my To247 trannies to my heatsinks...all my old amps have mica, but I thought I might progress into the next century since I am already 10 years into it...
Regards,El
Regards,El
Gyuri my dear friend thanks for your input, I am feeling the same way however a source for mica to247 is hard to come by in my small neighborhood,,,
If any one has a source for mica insulators TO247 Please let me know.. it never occurred to me to ask our friends at tech-diy whence came my silicon iritations.
Regards, Elwood
If any one has a source for mica insulators TO247 Please let me know.. it never occurred to me to ask our friends at tech-diy whence came my silicon iritations.
Regards, Elwood
If any one has a source for mica insulators TO247 Please let me know..
Elwood--
I am hopeful that the sheets of mica sold by McMaster Carr are the right type for this service.
Part number 8802K16 is a 3x5 sheet of muscovite mica, .004 thick, for a measly $2.17.
I have a roll of thermally conductive kapton film that I will be trying first, though, obtained from the same supplier.
JJ
Elwood--
I am hopeful that the sheets of mica sold by McMaster Carr are the right type for this service.
Part number 8802K16 is a 3x5 sheet of muscovite mica, .004 thick, for a measly $2.17.
I have a roll of thermally conductive kapton film that I will be trying first, though, obtained from the same supplier.
JJ
The sheet of Mica you are referring to works fine. Just cut a piece the size you need and off you go.
If you want to go crazy and reduce the thermal resistance further, with an xacto knife you can actually "slice" the sheet of mica into thinner sheets. It is easier to do than it sounds.
Pierre
If you want to go crazy and reduce the thermal resistance further, with an xacto knife you can actually "slice" the sheet of mica into thinner sheets. It is easier to do than it sounds.
Pierre
For class A amplfiers it's not such a big deal to have the extra thermal resistance of a silpad so long as you hit your particular desired junction (channel) temp after warmup... because there's not much dynamic about dissipation.. Far as cycling, you know, are you going to turn the thing on and off 500,000 times, or not? Not. A little rubber just means a bit more sink and you're good to go.
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mica comes in a wide range of thicknesses. The thinner, the less the thermal resistance.
"silpads" and similar come in an even wider range of thermal resistances. Choose a thermal resistance that suits your $ and your device temperature.
There are very few "silpad" types that can better a 2thou (= 2mil = 0.002inch) thick mica for thermal resistance.
"silpads" and similar come in an even wider range of thermal resistances. Choose a thermal resistance that suits your $ and your device temperature.
There are very few "silpad" types that can better a 2thou (= 2mil = 0.002inch) thick mica for thermal resistance.
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