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First One - mosfet amplifier module
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Old 7th November 2019, 10:45 AM   #4581
maxlorenz is offline maxlorenz  Chile
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Quote:
Originally Posted by Erlend Sæterdal View Post
Thanks Anthony 😁. What I think now is the procedure should start with adjusting the output stage bias. And not as Lazy at describe starting with. Tr 1 and 2.
I recommend a little chart, like:

"VR1 clockwise= current up- offset positive"
"VR1 C/clokwise= current down- offset negative"
"VR2 CW = ********* "
Etc. for example...

It worked for me.

Good luck.
M.
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Old 14th November 2019, 05:14 PM   #4582
Erlend Sæterdal is offline Erlend Sæterdal  Denmark
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First One - mosfet amplifier module
IMG_20191113_151604.jpg

Fantastic Result with this. 2 x 74 Vdc. Get hot 49 Celsius
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Old 16th November 2019, 04:09 PM   #4583
Tournesol is offline Tournesol  Belgium
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Quote:
Originally Posted by Erlend Sæterdal View Post
Attachment 794794
Get hot 49 Celsius
Just perfect, in my book.
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Old 16th November 2019, 08:00 PM   #4584
Erlend Sæterdal is offline Erlend Sæterdal  Denmark
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First One - mosfet amplifier module
Think it sounds perfect. But only have cheap Dali until Monday. Speakers for upgrade with new bass.
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Old 23rd November 2019, 01:19 PM   #4585
joztom is offline joztom  Slovenia
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What is the point for frying such as amplifier? In standard factor amplifying 26-30x, with 148V peak to peak is absolute overkill. Someone will say, you will became higher transition speed with higher voltage rail to rail. Nonsense, the material and topology inside current feedback amplifier are capable to serve up to 200V/uSEC or much more. The excellent bias for Exicons are about 150mA per transistor, so?
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Old 23rd November 2019, 03:26 PM   #4586
Erlend Sæterdal is offline Erlend Sæterdal  Denmark
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First One - mosfet amplifier module
Brought the First One for our club. It was so much better than our old Holton ( one old model maybe 10 years). Harbeth 40.1 and Holton was really ****. First One and Harbeth 40.1 was fantastic.

Last edited by Erlend Sæterdal; 23rd November 2019 at 03:29 PM.
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Old 24th November 2019, 02:27 PM   #4587
redjr is offline redjr  United States
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First One - mosfet amplifier module
Anyone know the Brand/model, or part no of the MOSFET output devices used on the First One M Module?
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Old 24th November 2019, 05:35 PM   #4588
zman01 is offline zman01  Bangladesh
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First One - mosfet amplifier module
redjr,

Please refer to this post:

First One - mosfet amplifier module

Not sure if simply replacing the FET results in a working module again - you might want to folks on the thread if they've tried.
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Old 26th November 2019, 05:14 PM   #4589
bondar100 is offline bondar100  Russian Federation
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Location: Moscow
Hello!

I have a L module.

The manual for M module says that the VAS balance bias affects DC offset. When I set 120 mV beetwin Tr1-Tr2 and Tr3-Tr4, I get a 0.1 V offset at the output. It looks too mutch. But when I set 0 Volt at the output by adjusting VR2, then on the Tr 3-4 I get 170 mV.

How to do it right?

And one more problemme.
I can't get the output stage bias less that 360 mA. The VR3 is fully twisted counterclockwise. The temperature of heatsilk is 65C (Is not too mutch?). The power supply is +/-70V.

Please help me.
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