Roender's FC-100 prototype and builder's thread - Page 48 - diyAudio
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Old 28th June 2012, 09:01 AM   #471
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Follow with interest your progress, very nice Rudi !
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Old 4th July 2012, 06:09 PM   #472
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I have been busy in the past days matching about 75 pairs of NJL0281DG / NJL0302DG transistors for the ones, who ordered.

This afternoon I have had some time to go on with my FC-100 build.

I adjusted the quiescent current / BIAS once more (without the bulb tester this time): 36.3 mV voltage drop across 2 emitter resistors
and measured the DC offset: 0.8mV (!!).

I then attached a "simulated speaker" to the AMP's output:

Click the image to open in full size.

This looks very well!

I will connect a pair of real speakers tomorrow and will tell you about my first sound-impressions.

Best regards - Rudi_Ratlos
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Old 4th July 2012, 08:16 PM   #473
zsaudio is offline zsaudio  Europe
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Hello Rudi,

what kind of trannies do you use in the LTP?
2sk170 or 2sk369?

Cheers
Zs
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Old 5th July 2012, 07:42 AM   #474
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Zs, I am using matched pairs of LSK170B.

Best regards - Rudi
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Old 18th July 2012, 11:55 AM   #475
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Last weekend I was happy to find enough time build my amp.
All parts were on stock. On Monday evening I was able to
plug the Amp to my loudspeaker in der living room.
I was very curious about the sound. The first impression was OK so far,
but not as well as my favorite Amp, the Symasym TO264.
I missed precision. Then I made a break of 1h. I was wondered, if I
continused my session: The sound was better than before! - Yeahh!
Now, after only a few hours sound is very, very good. I am impressed!
The heatsink is 140x400x40. After 1h it is about 50C.


@all
I recommend to build this wonderful amp asap.

claus1968

Click the image to open in full size.
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Old 18th July 2012, 12:34 PM   #476
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Bild: img_0155a62ex2.jpg - abload.de
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Old 18th July 2012, 04:16 PM   #477
zsaudio is offline zsaudio  Europe
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Quote:
I recommend to build this wonderful amp asap.
I second that

zsaudio
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Old 19th August 2012, 12:48 PM   #478
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After several weeks of holiday I have gone on with the build of my FC-100 (to be more precise: with the build of the case for my FC-100) today.

Click the image to open in full size.

http://www.abload.de/img/bp007emqxk.jpg

I have finally finished the back panel and mounted the "Soft-Power-On - PCB" onto it.

It makes fun to see my FC-100 grow up, very slowly, since everything is DIYed, and I wonder, how it will look like, when it is finally finished.
I have many choices concerning the top- and front-plate: ALU, wood, ACYRL, stone (schist??), ...

Next step will be to mount the needed transformers and stands to the bottom plate.

I will keep on showing my progress in this thread.

Isn't there anyone else to show his progress of his FC-100 buid?

Best regards - Rudi_Ratlos
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Old 19th August 2012, 01:32 PM   #479
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If you cannot open the URL of my "picture-provider": I apologize.

Here it is once more:

Click the image to open in full size.

Best regards - Rudi
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Old 19th August 2012, 02:12 PM   #480
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Rudi,looks very nice already
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