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Old 2nd March 2012, 05:34 PM   #881
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High power class A?
Multiamping is your best friend.
No more need to build monsters.
(Class D for the bottom.)
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Old 2nd March 2012, 08:43 PM   #882
Geofd is offline Geofd  Switzerland
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For me I want to build a V3 100W class A exactly as per the published design- to understand what kind of case/heatsink is needed a good refernce would be the musical fidelity AMS 100 - though this is balanced and bridged design (class A 100W into 8 ohm and 200W into 4Ohm)- it weighs in at 100Kg I recall

so all these cases/heatsinks discussed so far I expect will be far to small for a stero amp.


The plan is to use the Fischer SK535 (500 long * 400mm high) 0.08 K/W

SK 530 ... <br>SK 531 ... <br>SK 533 ... <br>SK 535 ... <br>SK 536 ... <br>SK 537 ... <br>SK 538 ... <br>SK 539 ... <br>SK 540 ..., Standardstrangkhlkrper, Khlkrper f.cool, Fischer Elektronik

So with 240 watts of dissipation then I hope to get around 20 degrees of rise.

And use the type of construction as per the recent absolutly amazing (or Fugly as some say) F4 posted in the Amp secton of this forum (bolt the top, bottom front ad back panels to the heatsinks)

I live in switzerland and to get these things made here will be quite expensive so maybe it will be cheaper just to by the 16k Euro AMS than build a case for the F5T ? lets see.
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Old 2nd March 2012, 08:46 PM   #883
6L6 is offline 6L6  United States
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It will be significantly cheaper to do it yourself. The cases will be expensive, no doubt, but much cheaper than a commercial product.
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Old 3rd March 2012, 12:17 AM   #884
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by JBL4435 View Post
Good joke

Dissipation is 260W per channel and I measure app. 45°C.
Don't know how you claculate but these mono chassis (4 of these heatsinks) have 0.07 K/W
From past experience they looked small for a 200 watt/ch Class-a amp ...

Quote:
Originally Posted by AndrewT View Post
What's wrong with 150W of ClassA into 8r0?

That just 6.13Apk into the load.
And from a Push Pull amplifier like the F5, would require a bias of ~3.1Adc

The F5T would be equivalent to 75W into 4r0 from each half of the balanced amplifier.
Still a lot of heat and consumption .....
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Old 3rd March 2012, 03:49 AM   #885
lhquam is offline lhquam  United States
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Quote:
Originally Posted by labjr View Post
I had considered having an enclosure made in the U S. However, it is quite a project to take on and there wasn't much interest last year. Everyone seemed to want the cheapest thing that would work. Personally, I like elegant stuff and it would be in my living-room so I don't have a problem if it costs a bit more than the cheapo offerings.

Would be even more difficult to do something for the F5-T since there are so many variations of the amp with different heatsinking requirements. So there proably won't be a one-size-fits-all enclosure.

Reading some of these posts, I think some maybe taking on a rather difficult project with V3 versions etc. I know, as I read the manual, I started to wonder if I really need more power than the original F5's 25 watts.
For most home audio situations I suspect that you are correct about 25 watts being enough. I am a firm believer in the FirstWatt principles.
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Old 3rd March 2012, 07:09 AM   #886
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Quote:
Originally Posted by labjr View Post
I started to wonder if I really need more power than the original F5's 25 watts.
Maybe this help

A Test. How much Voltage (power) do your speakers need?
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Old 3rd March 2012, 09:44 AM   #887
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Quote:
Originally Posted by Geofd View Post
AMS 100 weighs in at 100Kg.
The MF has CLC power supplies, the 2 toroidal transformers and 4 block chokes (EI look) account for most of the weight.
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Old 3rd March 2012, 12:19 PM   #888
labjr is offline labjr  United States
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Is anything gained by adding diodes to the F5 output stage?
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Old 3rd March 2012, 12:21 PM   #889
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Unlimited by source resistors current
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Old 3rd March 2012, 12:52 PM   #890
Tea-Bag is offline Tea-Bag  United States
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Quote:
Originally Posted by Bksabath View Post
Unlimited by source resistors current
I still have a hard time understanding the operation that allows it to move from idle current over the source resistors to the diodes themselves. Is this determined by the diode behavior and characteristics?
Can someone spell this out for me using simple words, and easy math?
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