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
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
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
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
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
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