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Old 3rd July 2014, 12:39 PM   #901
wineds is offline wineds  Australia
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Thanks Mihai! I will try it. The bass control is incredible. Everything else is in its place. Doesn't seem to matter how complex the recording is everything can still be heard. And even more amazing is total lack of fatigue even at quite high levels for a long time.
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Old 3rd July 2014, 03:56 PM   #902
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Please watch the temperature of the transistors. Those silicon pads often conduct heath worse than mica + goop.
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Old 3rd July 2014, 04:03 PM   #903
AndrewT is offline AndrewT  Scotland
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Yes !!!!
I ran out of rubbery type and used mica on one the devices in another amp.

The currents in the devices measured as very different, from a matched set I had measured up.
I instantly doubted my matching.

It turns out that the mica mounted device was running cooler than the adjacent sil-pad mounted devices.
That cooler Tj resulted in higher Vbe and less current. The sil pad devices now had to take a bigger share of the current and ran hotter still.
Changing the other two devices to mica, cured the mismatched currents. The other polarity remained as sil-pad mounted for the duration of my testing.
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Last edited by AndrewT; 3rd July 2014 at 04:05 PM.
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Old 5th July 2014, 11:51 AM   #904
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Paul, if you like, I will assist you with the build of a nice case for your FC-100.
The FC-100 is worth giving the nicest-looking case to it!
It is the very best DIY-amplifier that I have ever listened to!

This is how I did it (see attached image).

I you like my case's "general" design: you need a couple of small ALU-brackets, three 2mm thick ALU-plates (top, bottom and rear) and a wooden front plate.
Since I have integrated my passive PRE into the FC-100's case "on the second floor" (making it an Integrated Amplifier), I needed to install a LCD into the wooden plate.
I should have done the insertion of the LCD into the wooden front in a better way, I know. The black plastic frame really looks nasty!


Best regards - Rudi

P.S. The "silver" knobs and intarsia do "not look good" either. I would have done the front in another way today!
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Last edited by Rudi_Ratlos; 5th July 2014 at 12:00 PM.
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Old 25th July 2014, 06:06 AM   #905
wineds is offline wineds  Australia
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Does anybody known of a suitable point to add a line level sub woofer output without any sonic impact? I know this would normally be done in the preamplifier but I am using Rudi"s passive VCpre and don't want to load it up. Maybe The NFB point could be used?
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Old 25th July 2014, 08:57 AM   #906
AndrewT is offline AndrewT  Scotland
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Parallel the input sockets and daisy chain from input socket to the newly added output socket.
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Old 25th July 2014, 09:41 AM   #907
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Paul, if you are afraid of "overloading" the LDRs of the VCPre, I will send you a line-buffer PCB, my modified version of Calvin's buffer, a very, very splendid buffer - for nothing !

Best regards - Rudi
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Old 25th July 2014, 11:03 AM   #908
wineds is offline wineds  Australia
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Quote:
Originally Posted by Rudi_Ratlos View Post
Paul, if you are afraid of "overloading" the LDRs of the VCPre, I will send you a line-buffer PCB, my modified version of Calvin's buffer, a very, very splendid buffer - for nothing !

Best regards - Rudi

Many thanks for that offer. I am sure it is a great buffer. But I am trying to keep the signal chain as short and simple as possible.

At the moment its just DAC/CD -> VCPRE -> FC100 and it sounds sublime.
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Old 25th July 2014, 07:16 PM   #909
Sheldon is offline Sheldon  United States
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Quote:
Originally Posted by wineds View Post
Does anybody known of a suitable point to add a line level sub woofer output without any sonic impact? I know this would normally be done in the preamplifier but I am using Rudi"s passive VCpre and don't want to load it up. Maybe The NFB point could be used?

Just use a voltage divider and take it from the output.

Sheldon
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Old 26th July 2014, 12:58 AM   #910
wineds is offline wineds  Australia
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Quote:
Originally Posted by Sheldon View Post
Just use a voltage divider and take it from the output.

Sheldon
Thanks Sheldon I may well do that.
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