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Old 3rd November 2012, 08:48 AM   #2071
Jay is offline Jay  Indonesia
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And the Electrocompaniet version from a russian site (I forgot right now, had internet issue at home), so a word document file...
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Old 3rd November 2012, 09:04 AM   #2072
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Just a bit of funfact:

Tandberg introduced the term DIM, wich in fact is excactly the same as TIM already in 1974.
Also I was lucky enough to have an professor as my teacher when I got my education as an electronics engineer. The very same professor wich trained people behind DOXA, SONOTRON (Later ADYTON), and other HIEND-manufacturers in Norway.
We named him "Professor Balthasar", as he looked just like him.
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Old 20th November 2012, 05:01 AM   #2073
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Quote:
Originally Posted by Jay View Post
And the Electrocompaniet version from a russian site (I forgot right now, had internet issue at home), so a word document file...
Hi Jay.

Any diagrams for the powersupply?

It is mentioned in the article following the schematics for this amp,

"The amplifier is fed by symmetrical voltage 19V -44V and +/-26V to the power stage".

I am confused of the use of the term symmetrical voltage of 19V and -44V.
Clearly non-symmetrical as I can see it.

Anyone who can give some good input on this issue?
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Old 20th November 2012, 09:08 AM   #2074
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by TANDBERGEREN View Post
Hi Jay.

Any diagrams for the powersupply?

It is mentioned in the article following the schematics for this amp,

"The amplifier is fed by symmetrical voltage 19V -44V and +/-26V to the power stage".

I am confused of the use of the term symmetrical voltage of 19V and -44V.
Clearly non-symmetrical as I can see it.

Anyone who can give some good input on this issue?
Hi, I don't have the power supply, sorry.

The original article in the Greek site I think was not accurate (τροφοδοτείται με συμμετρικές τάσεις +19V και -44V). The English translation found in the PDF is more accurate "The amplifier is fed by non symmetrical voltage 19V -44V and +/-26V to the power stage"

Here is the English translation (PDF)
http://sportsbil.com/other/ELECTROCOMPANIENT%20SCH.pdf

Here is in Greek
Electrocompaniet
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Old 20th November 2012, 12:08 PM   #2075
msdin is offline msdin  United Kingdom
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Default The original Electrocompaniet 25 watt class A amp

Quote:
Originally Posted by TANDBERGEREN View Post
Hi Jay.

Any diagrams for the powersupply?

It is mentioned in the article following the schematics for this amp,

"The amplifier is fed by symmetrical voltage 19V -44V and +/-26V to the power stage".

I am confused of the use of the term symmetrical voltage of 19V and -44V.
Clearly non-symmetrical as I can see it.

Anyone who can give some good input on this issue?
The supply voltages are not correct the feeds are symemetrical +/-27V for the input stage and +/- 33.8V for the output stage.
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Old 21st November 2012, 01:20 PM   #2076
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Better answer from Jay there msdin.

Checked with some others too, and they confirmed that the supply for the input stages are infact non-symmetrical.

Thanks Jay.
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Old 8th December 2012, 11:19 PM   #2077
RS232 is offline RS232  United Kingdom
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Hi all
Just to ask if the issue with the overheating in the VAS of this amp was sorted .
I'm inclined to build one for myself and I want to know if that issue was sorted.

Ric
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Old 9th December 2012, 06:06 PM   #2078
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The original GM design uses one clip-on heatsink for each VAS transistor.
Hope this helps.
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Old 9th December 2012, 10:13 PM   #2079
RS232 is offline RS232  United Kingdom
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Humm, yes I know that but in the last pictures the op but a huge heatsink on them apparently because the small one were not good enough.
I don't want to build something that is not reliable and safe.

Ric
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Old 11th December 2012, 06:37 AM   #2080
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Default Golmund clone

Small heatsink for cold sites like Switzerland.
You must choose VAS stage 72 -75 degrees Celsius OR VAS stage 52-56 degrees Celsius.Temperature room 31 degrees Celsius. (Greece Summer edition )
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