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Old 10th December 2014, 04:15 AM   #3811
thimios is offline thimios  Greece
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Quote:
Originally Posted by Bonsai View Post
no - this was taken on the actual heatsink on the outside between the fins.
It will be interesting if you can measure directly on transistors body.
This way we can see the mica or rubber quality.
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Old 10th December 2014, 07:35 AM   #3812
apexaudio is offline apexaudio  Serbia
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Default APEX A23

CFA amplifier made by 44250
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Old 10th December 2014, 10:08 AM   #3813
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by thimios View Post
It will be interesting if you can measure directly on transistors body.
This way we can see the mica or rubber quality.
I reported this in the Roender amp Thread.

Mica with two layers of Thermal goop was less Thermally resistant than the quite good soft insulator with no Thermal goop.
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Old 10th December 2014, 10:06 PM   #3814
ostripper is offline ostripper  United States
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I would trust the actual manufacturer with insulator choice (below).
Sanken MT-200 .... with VERY thin mica (included with devices).

os
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Old 12th December 2014, 06:49 PM   #3815
thimios is offline thimios  Greece
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Originally Posted by ostripper View Post
I would trust the actual manufacturer with insulator choice (below).
Sanken MT-200 .... with VERY thin mica (included with devices).

os
Hi OS,from which you have bought these?
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Old 12th December 2014, 08:08 PM   #3816
pinnocchio is offline pinnocchio  Canada
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Quote:
Originally Posted by thimios View Post
Hi OS,from which you have bought these?
Digikey in the US sells them. I just bought a batch of them last week, comes with the micas.

You can also get the micas here
MT 200 Transistor Mica Insulator Insulation Sheet X 50 | eBay

Ciao!
Do
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Old 12th December 2014, 08:14 PM   #3817
jwilhelm is offline jwilhelm  Canada
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They were dirt cheap at Newark until a couple weeks ago. I cleaned them out of 2SA1295 though.
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Old 12th December 2014, 08:30 PM   #3818
pinnocchio is offline pinnocchio  Canada
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There's 279 left at Digikey
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Old 13th December 2014, 05:52 PM   #3819
thimios is offline thimios  Greece
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I know, but here in Europe we can't order from digikey (taxes charge)
I see that Profusion sell Sanken also.

Last edited by thimios; 13th December 2014 at 05:59 PM.
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Old 13th December 2014, 05:54 PM   #3820
jwilhelm is offline jwilhelm  Canada
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Originally Posted by thimios View Post
I know, but here in Europe we can't order fro digikey (taxes charge)
I see that Profusion sell Sanken also.
Farnell sells Sanken.
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