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Old 19th July 2019, 12:52 PM   #16061
potstip is offline potstip  Turkey
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I can buy one today. Is there any suggested value for heatsink and mosfets?
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Old 19th July 2019, 01:16 PM   #16062
McQuaide is offline McQuaide  United States
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Quote:
Originally Posted by potstip View Post
I can buy one today. Is there any suggested value for heatsink and mosfets?

Nelson says 20C above room temperature max. The commercial F5 runs at 25c above which is where mine is when biased at .7v. He also says you should be able to keep your hand on the sink for 5 seconds.


Measuring the MOSFET bodies helps to determine if heat is being effectively transferred to the sink.
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Old 19th July 2019, 05:13 PM   #16063
Nelson Pass is offline Nelson Pass  United States
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Here's a helpful guideline...
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Old 20th July 2019, 12:51 PM   #16064
potstip is offline potstip  Turkey
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Quote:
Originally Posted by Nelson Pass View Post
Here's a helpful guideline...
Great explanation thx. Mr.Nelson.

If you decided to couple f5 with preamp which one is your choice.

B1,
B1 R2,
B1 with KORG Triode,
Mezmerize B1
Ba-3

Regards...

Last edited by potstip; 20th July 2019 at 12:57 PM.
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Old 20th July 2019, 05:53 PM   #16065
Nelson Pass is offline Nelson Pass  United States
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F5 power amplifier
B1 if you want neutral, Korg if you want it colorized.

This assumes that original B1 has enough gain. You can find out by going directly
from source to amp and see if it's loud enough. Use low level music to make that
decision so you don't break your drivers....
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Old 20th July 2019, 06:02 PM   #16066
Variac is offline Variac  Costa Rica
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Potstip is very clever IMHO. He accumulated lots of parts and PC boards while working and now that he has cleverly and correctly quit his job, he has time to assemble amps! Which helps lower stress due to having no job...I think Zen Mod would approve....

Quote:
Originally Posted by labjr View Post
You need a part time job to buy all those Z-foil resistors!
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Last edited by Variac; 20th July 2019 at 06:11 PM.
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Old 20th July 2019, 06:07 PM   #16067
Nelson Pass is offline Nelson Pass  United States
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Here we are 11 years and 3.6 million views later.

I had forgotten about the surgery until I just landed on the first post.

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Old 20th July 2019, 08:42 PM   #16068
elwood625 is offline elwood625  United States
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Forgotten surgeries are the best kind.
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