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Old 4th September 2002, 06:03 PM   #11
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Although big, that transformer is probably better than toroid.
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Old 5th September 2002, 02:32 AM   #12
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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, Id 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
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Old 5th September 2002, 07:39 AM   #13
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Default Again, go for it!

Maybe a pic makes it easier to go for it.
It runs now for ca. 1,5 years without any
problem.
Andreas
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Old 5th September 2002, 07:50 AM   #14
2Bak is offline 2Bak  Denmark
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thanks Orgonom
I think I'll go for them.
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Old 5th September 2002, 08:41 AM   #15
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Default 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
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Old 5th September 2002, 09:07 AM   #16
2Bak is offline 2Bak  Denmark
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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
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Old 5th September 2002, 09:39 AM   #17
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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
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Old 5th September 2002, 04:58 PM   #18
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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
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Old 6th September 2002, 12:35 AM   #19
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Andreas

Your amp looks nice and looks better than mine.
By the way, for the capacitors, why not wiring as in Fig.(B)...?
I mean to persue a possibility of minimal hum and buzz.

JH
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Old 11th September 2002, 10:25 AM   #20
Eccu is offline Eccu  Finland
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Or why wiring like fig (A), but wires to amplifier take from upper capasitor.
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