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Roender'S FC-100 - Group Buy
Roender'S FC-100 - Group Buy
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Old 16th October 2017, 11:46 PM   #321
wineds is offline wineds  Australia
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Quote:
Originally Posted by pinnocchio View Post
Guys, I need some help please...

As per my previous posts, one of my FC-100 module died some time ago. It kept burning PSU fuses so I checked it but couldn't find the issue. After chacking some more, I realized that most output devices had been destroyed. So I went ahead and ordered a bunch of N and P and matched them, soldered them to the PCB and changed the 15034-35 drivers.

Checked all voltages from shunt and PSU before, checked fuses and powered on. Amp powered properly and I started the calibration process, that is bias. I turned it all the way to 38mV (reading across output resistors) and then after a minute or two, D2 went very dim and bias dropped to 0mV... Heatsink got a little colder and then D2 came back fully lit and bias went back to normal. On next power up, D2 kept very dim but I also realized that it was also D7 that was dim and bias stays at 0mV.

I'm guessing something is wrong with the input stage, probably got damaged when the output stage got destroyed. I can check voltage reading but I don't know what to look for really... Could the pre-drivers be damaged as well? If it is the case, Q19, Q20 are obsolete and because of this, finding a match set is not going to be an easy task... I don't mind paying but I want to be sure it is the problem.

Thanks
Do
Hi Do. Sorry to hear about your trouble. I still have some 2sa1360/2sc3423. Closest match I have is hfe 158/183 which is not bad as there was about hfe 20 difference between all of them in my build. Let me know if I can help.

Cheers, Paul
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Old 17th October 2017, 03:24 AM   #322
anatech is offline anatech  Canada
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Roender'S FC-100 - Group Buy
Hi Do,
Cover the shipping and I'll do my best to help you out. If parts are needed, you can supply them. Or ship it with parts and I'll make sure you get the unused ones back. Do me a favour and ship with the heat sink you are using.

I'll PM you my details, and if you are okay with the arrangement just let me know when you have shipped so I can watch for it.

Best, Chris
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Old 17th October 2017, 03:39 PM   #323
pinnocchio is offline pinnocchio  Canada
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Quote:
Originally Posted by wineds View Post
Hi Do. Sorry to hear about your trouble. I still have some 2sa1360/2sc3423. Closest match I have is hfe 158/183 which is not bad as there was about hfe 20 difference between all of them in my build. Let me know if I can help.

Cheers, Paul
Hi Paul,
Hold on to them for about a week or two, I'm traveling these days and will not have time for anything.
Thanks!

Quote:
Originally Posted by anatech View Post
Hi Do,
Cover the shipping and I'll do my best to help you out. If parts are needed, you can supply them. Or ship it with parts and I'll make sure you get the unused ones back. Do me a favour and ship with the heat sink you are using.

I'll PM you my details, and if you are okay with the arrangement just let me know when you have shipped so I can watch for it.

Best, Chris
Hi Chris,
That's really a great offer. As per above, I will have to wait a little since I'm traveling for work these coming days. I will prep stuff when I'm back.

Thanks for everything
Do
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PREAMPs : AMB α10 + USSPA | Bal DCB1 | Bal LDR3x | AMPs: AMB β24 | USSA3 & 5 | TGM8 | VZ Audio NS OPS | NX Amp | FC-100
DACs : TPA BII + OPC's NTD1 I/V | Signalyst DSCv2 | Mirand AK4490 + Discrete Output Speakers : Troels Gravesen ATS-4 | Sagwee LT V3
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Old 17th October 2017, 05:18 PM   #324
anatech is offline anatech  Canada
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Roender'S FC-100 - Group Buy
Hi Do,
No problem. It's only audio, not life threatening by any means ... Just send me a message when you do ship it so I know to expect it.

-Chris
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Old 22nd December 2017, 03:25 PM   #325
pinnocchio is offline pinnocchio  Canada
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Just wanted to take the time and wish a Merry Christmas to everyone

All the best!
Do
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PREAMPs : AMB α10 + USSPA | Bal DCB1 | Bal LDR3x | AMPs: AMB β24 | USSA3 & 5 | TGM8 | VZ Audio NS OPS | NX Amp | FC-100
DACs : TPA BII + OPC's NTD1 I/V | Signalyst DSCv2 | Mirand AK4490 + Discrete Output Speakers : Troels Gravesen ATS-4 | Sagwee LT V3
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Old 23rd December 2017, 04:45 PM   #326
atupi is offline atupi  Romania
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Merry Christmas everyone and enjoy your Fc100!
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Rega RP-1/Simplistic RIAA by Salas/ DCB1 clone/ MyRef Fremen Edition/FC-100/ XTZ 99.26 MkII speakers
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Old 28th December 2017, 06:23 PM   #327
Telstar is offline Telstar  Italy
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Nice!
I still have to build the first one :/
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Old 4th January 2018, 09:15 PM   #328
lordoff is offline lordoff  Bulgaria
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Merry Christmas to everyone,
and Happy New Year!

Best wishes and healthy, full of time for diy projects!

I feel little obsession from FC-100 design and project.
My primary interest in diy audio was tube differential amplifiers, but...
my everyday amplifier are Luxman L-530 and I love this sound.
Those luxmans are very, very similar in idea to Roender's FC-100.
Expecting FC-100 to be more, more refined in sound, thankfully excellent power supply and contemporary design.

So guys, any PCB board available somewhere? Or gerber files...
I will try to read again all long themes, to understand very well evolution of design and parts in times....

strangely or not, don't asking about sound
because, yes, I know very well how can sound good designed folded cascode!

Best Regards,
Kiril
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Old 26th February 2018, 05:14 AM   #329
bk856er is offline bk856er  United States
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Roender'S FC-100 - Group Buy
Finally starting my FC100 build. Mostly finished the shunt supplies today. Do the two components on the shunt heatsink need to be electrically isolated with pads and shoulder washers, or is goop and a metal screw OK here?


BK
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Old 26th February 2018, 09:39 AM   #330
Rudi_Ratlos is offline Rudi_Ratlos  Germany
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In case that you are using Fischer SK104 heatsinks: the heatsinks have pads that connect to the GND plane of the PCB.

You need therefore to isolate the MJE - transistors (back and screw), the collectors of which are connected to +/- output voltage.

The BD transistors need not to be isolated since they are made of plastic.

Regards - Rudi
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