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Old 8th January 2012, 04:14 PM   #1041
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Quote:
Originally Posted by jacco vermeulen View Post
A 50W Dale RH series in free air does 20W at 25C ambient.
The 50W rating at 25C requires a heatsink surface that shouldn't be underestimated.

(btw, the Dale RH-50 and RH-100 have been around for many decades. When i first used them in the mid '80s, Dale was the single ready available industrial power resistor brand available overhere)
This is correct, and what I believed I had learned long ago was wrong...Thanks for setting me straight!
But I guess I proved those Dale RH-50 are tough!?
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Old 8th January 2012, 08:11 PM   #1042
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Afair, an RH-50 handles 250W short term.

Doesn't imply that i disagree with EUVL, Patrick is really knowledgeable.
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Old 9th January 2012, 12:31 AM   #1043
Pano is offline Pano  United States
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Old 10th January 2012, 08:54 AM   #1044
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Quote:
Originally Posted by AndrewT View Post
Add up all the dissipations of all the components making up your amplifier.
That should exactly equal the Power Input from the Mains.
...
Everything else is dissipated inside the chassis ...
And what about the power dissipated on the speaker coil?


Quote:
Originally Posted by CanAm Man View Post
Yep. Those "metal jacket" power resistors are intended for heat sink mounting, and should be significantly derated if not used that way.
I have managed to push 150W on a 25W resistor for a long-term period keeping it at 50-60º. I am using one of these heatsinks placed next to a 14cm industrial high CFM (and noise!) fan.
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Old 10th January 2012, 10:42 AM   #1045
AndrewT is offline AndrewT  Scotland
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Originally Posted by regiregi22 View Post
And what about the power dissipated on the speaker coil?
What speaker?
It's not mentioned nor included.
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Old 15th January 2012, 05:00 AM   #1046
reytnz is offline reytnz  New Zealand
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Default ..More photos

I've tidied-up the wiring a bit, Plain F5 not yet TURBONIZED
Attached Images
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Last edited by reytnz; 15th January 2012 at 05:13 AM.
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Old 15th January 2012, 05:34 AM   #1047
Blues is offline Blues  United States
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Nice one Rey...
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Old 15th January 2012, 09:50 AM   #1048
apj1 is offline apj1  Spain
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Default Aleph X

In Mount ...
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Old 15th January 2012, 01:46 PM   #1049
6L6 is online now 6L6  United States
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apj1 - Wow! That looks wonderful!!

What circuit boards are those?
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Old 15th January 2012, 01:49 PM   #1050
tinitus is offline tinitus  Europe
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fantastic, and so clean
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