Found two old heatsinks, on which I do not have the heat dissipation data.
They measure H x W x D, 220 mm x 200 mm x 70 mm.
Would there be a chance that they are able cool down the Boz 4 @ 2 x 30 watt or 2 x 25 watts?
one sink for each side
tanx
They measure H x W x D, 220 mm x 200 mm x 70 mm.
Would there be a chance that they are able cool down the Boz 4 @ 2 x 30 watt or 2 x 25 watts?
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
one sink for each side
tanx
I'm afraid they are not enough. But if you stack them face to face and run a fun they might be OK.
Thanks Peter Daniel
I might consider a fan.
I'm not quite sure what stack them face to face means...
topview:
is that it?
Are silent fans for CPU cooling applicable for amps?
regards
Jan Bak Madsen
I might consider a fan.
I'm not quite sure what stack them face to face means...
topview:
An externally hosted image should be here but it was not working when we last tested it.
is that it?
Are silent fans for CPU cooling applicable for amps?
regards
Jan Bak Madsen
Works good
Hallo 2Bak,
i use these sink also with my zen (bias 3,5 A - 43V).
So i´m dissapating 150W. Hot, but under 55 GradC.
Go for it.😀
Andreas
Hallo 2Bak,
i use these sink also with my zen (bias 3,5 A - 43V).
So i´m dissapating 150W. Hot, but under 55 GradC.
Go for it.😀
Andreas
2Bak
I use the size:
H: 250 mm
W: 230 mm
D: 65 mm
Number of fins: 18
Two FETs are fitted on one sink--average 2A each at DC supply of 32V.
It's rather hot--about 50 degC at room temp 27 degC.
Mine should have been a bit bigger.
I recommend you to increase the size.
Hope this helps...
JH
I use the size:
H: 250 mm
W: 230 mm
D: 65 mm
Number of fins: 18
Two FETs are fitted on one sink--average 2A each at DC supply of 32V.
It's rather hot--about 50 degC at room temp 27 degC.
Mine should have been a bit bigger.
I recommend you to increase the size.
Hope this helps...
JH
well, this will be a hard decision for me to make. Was hoping for a few more of them "go for it", like Orgonoms... 
Also found an EI transformer 800VA, 2x18v. Guess you guys will turn your thumbs down on this transformer type also?
Weight 10 kilo = 22 pounds lb
175x135x115 mm
Also found an EI transformer 800VA, 2x18v. Guess you guys will turn your thumbs down on this transformer type also?
An externally hosted image should be here but it was not working when we last tested it.
Weight 10 kilo = 22 pounds lb
175x135x115 mm
Hi 2Bak.
I'd use it if you have room. Why buy when you have a x-former like that in hand.
later
Bruce
I'd use it if you have room. Why buy when you have a x-former like that in hand.
later
Bruce
I use both EI and toroidal transformers.
I prefer EI type though its physical size is big. My ears detect a bit relaxed-muscle sound with the EI type.
During DIY life, I have been much concerned on the poor quality of transformers. I have been kind of short-tempered mostly with the transformers. If the amp designer recommends, e.g. 300VA transformer, I’d like the VA size of one step bigger. And, I prefer the transformer made for the 50Hz AC supply. A well-known story is that The 50Hz AC transformer is no problem when it is moved to the 60Hz AC zone, but the 60Hz AC transformer is almost always problem when moved to the 50Hz zone.
Hope you to check and select the right one.
JH
I prefer EI type though its physical size is big. My ears detect a bit relaxed-muscle sound with the EI type.
During DIY life, I have been much concerned on the poor quality of transformers. I have been kind of short-tempered mostly with the transformers. If the amp designer recommends, e.g. 300VA transformer, I’d like the VA size of one step bigger. And, I prefer the transformer made for the 50Hz AC supply. A well-known story is that The 50Hz AC transformer is no problem when it is moved to the 60Hz AC zone, but the 60Hz AC transformer is almost always problem when moved to the 50Hz zone.
Hope you to check and select the right one.
JH
about the transormer
Dear 2BAK,
Having built my second JLH 10W amplifiers with EI transformers, I must say that the humming of the transformers I used is really frustrating (again). But this time I'm aware that the humming of the transformer is the problem and not the earthing, the circuit or something like that.
I am solving the problem right now, by placing the transformers in a separate housing.
Just curious, how heavy is the transformer?
Wishing you all the best.
Luuk Boessenkool
Dear 2BAK,
Having built my second JLH 10W amplifiers with EI transformers, I must say that the humming of the transformers I used is really frustrating (again). But this time I'm aware that the humming of the transformer is the problem and not the earthing, the circuit or something like that.
I am solving the problem right now, by placing the transformers in a separate housing.
Just curious, how heavy is the transformer?
Wishing you all the best.
Luuk Boessenkool
boessenkool,
10 kilo.
The guy who sells them to me has two of 'em. Thus I can build monoblocks if I want to...
He says that humming and noise in an amp would not be caused by them, but by wiring problems and maybe the position of the trafo in the case....
/Jan
10 kilo.
The guy who sells them to me has two of 'em. Thus I can build monoblocks if I want to...
He says that humming and noise in an amp would not be caused by them, but by wiring problems and maybe the position of the trafo in the case....
/Jan
Dear Jan,
Who knows.....
At least for my amp, I know for certain that the EI transformer is the problem. With all wires still connected I moved the transformer around and when the transformer was outside the casing, the hum disappeared.
All I meant to say was, that with such a transformer hum is a real posibllity.
Greatings,
Luuk Boessenkool
Who knows.....
At least for my amp, I know for certain that the EI transformer is the problem. With all wires still connected I moved the transformer around and when the transformer was outside the casing, the hum disappeared.
All I meant to say was, that with such a transformer hum is a real posibllity.
Greatings,
Luuk Boessenkool
Luuk
Hum when the transformer is installed inside the casing and no hum when installed outside the casing...? Then, your transformer is fine because the transformer outside the casing is OK. I would like to say that the hum is due to an improper wiring arrangement inside the casing.
JH
Hum when the transformer is installed inside the casing and no hum when installed outside the casing...? Then, your transformer is fine because the transformer outside the casing is OK. I would like to say that the hum is due to an improper wiring arrangement inside the casing.
JH
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