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Old 21st February 2012, 09:14 PM   #411
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Quote:
Originally Posted by Horio View Post
Looking great! The more I think about it, the more I prefer having the input and output boards separated.

Can you add some mounting holes to both boards? Also, any way you might be able to setup the PS Board to accept Fukushima MPC74 type power resistors? I'm finishing up a big GB for these resistors, and I'm about to mail out 900 of these things. I have a feeling a few members might want to use it on your PS Board.
Let me grab the data sheet and look at that
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Old 21st February 2012, 09:15 PM   #412
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and the stereo amp will need atleast twice the baseplate as the monoblocks, to spread the heat. thats not cheep.
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Old 21st February 2012, 09:31 PM   #413
a.wayne is offline a.wayne  United States
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AudioSan , you are one funny guy ... you do know you need 2 chassis for Mono Bloc's, let me fix it for you ...

Quote:
Originally Posted by AudioSan View Post
lets take it more spesific.
stereo amp:
4pc. 10x12" heatsinks
1pc. 17x12" front
2pc. 20x11" topp/bottom
1pc. 11x12" back

2 monoblock:
8pc. 10x3" heatsinks
2pc. 17x3" front
4pc. 20x11" topp/bottom
2pc. 11x3" back
Now you have 2 chassis cheaper than one ....

Quote:
Originally Posted by AudioSan View Post
2 monoblocks ARE cheeper.
Yes i know, just the stupid manufacturers haven't figured that out yet and still offer stereo amplifiers in one chassis ...

Quote:
Originally Posted by AudioSan View Post
and the stereo amp will need atleast twice the baseplate as the monoblocks, to spread the heat. thats not cheep.
Have you priced out fans .... they work ... anyway looking forward in seeing your 3 inch high mono blocs .....

Last edited by a.wayne; 21st February 2012 at 09:35 PM.
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Old 21st February 2012, 09:35 PM   #414
Horio is offline Horio  United States
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Quote:
Originally Posted by UKToecutter View Post
Let me grab the data sheet and look at that
Here is the data sheet:

Fukushima Ceramic Plate Resistors MPC74

The GB was for the straight type MPC74, which looks to have a lead spacing of 9mm with 0.8mm leads.
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Old 21st February 2012, 09:41 PM   #415
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Quote:
Originally Posted by a.wayne View Post
You are a funny guy ... you do know you need 2 chassis for Mono Bloc's, let me fix it for you ...



Now you have 2 chassis cheaper than one ....



Yes i know, just the stupid manufacturers haven't figured that out yet and still offer stereo amplifiers in one chassis ...



Have you priced out fans .... they work ...
stereo amp chassis need to be 4 times taller then 2 monoblock chassis to handle the same amount of power. so twice as mutch heatsinks. twice as big front/back as 2 mnoblocks together we are not talking about fans now. and the bigger the heatsink the thicker baseplate of the sinks. thats a fact!!
we are NOT talking about monoblocks and stereoamp of same sice!!!!!!
a 2x100W stereo class A amp most be 4 times taller then a 1x100W class A monoblock(taken the same type sinks and depth)!!

BTW: i had calculated for 2 monoblocks. find a calculator and look and the total numbers i gave you. those are for 2 monoblocks. not for one!

Last edited by AudioSan; 21st February 2012 at 09:46 PM.
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Old 21st February 2012, 09:51 PM   #416
lhquam is offline lhquam  United States
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Location: Olalla, Oregon: Land of the 100 Valleys
Quote:
Originally Posted by UKToecutter View Post
Let me grab the data sheet and look at that
The mention of Fukushima suggests the total meltdown of this beast when the cooling system fails!
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Old 21st February 2012, 09:53 PM   #417
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by AudioSan View Post
stereo amp chassis need to be 4 times taller then 2 monoblock chassis to handle the same amount of power. so twice as mutch heatsinks. twice as big front/back as 2 mnoblocks together we are not talking about fans now. and the bigger the heatsink the thicker baseplate of the sinks. thats a fact!!
we are NOT talking about monoblocks and stereoamp of same sice!!!!!!
a 2x100W stereo class A amp most be 4 times taller then a 1x100W class A monoblock(taken the same type sinks and depth)!!

BTW: i had calculated for 2 monoblocks. find a calculator and look and the total numbers i gave you. those are for 2 monoblocks. not for one!
San ,

I increased your numbers in my response, your original post had parts for one mono amp. The heatsinks in stereo is not necessarily 4 times the size and most if not all expressed using fans..

Even if i had monster heat sinks i would still use a temperature controlled fan for the case and i still say you cannot fit 4 boards , caps, rectifiers and transformer in a 3 inch tall case, so your numbers are off...
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Old 21st February 2012, 09:53 PM   #418
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Jacco,

Good spot.
How is this..........

Click the image to open in full size.
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Old 21st February 2012, 09:54 PM   #419
labjr is offline labjr  United States
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Quote:
Originally Posted by a.wayne View Post


Yes i know, just the stupid manufacturers haven't figured that out yet and still offer stereo amplifiers in one chassis ...


What manufacturers are you talking about? I'm not aware of too many that make Class A amps. It's easier to make two separate board sets into a stereo amp than it is to do the other way.
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Old 21st February 2012, 09:59 PM   #420
bcg27 is offline bcg27  United States
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Wow a ton of movement on this thread over the weekend. Please put me down as interested in 4 amp boards and 2 power supply boards.

Got a ton of reading to do to catch up!
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