Need to build JC 2 preamp

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mikeks

mikeks

Disabled Account
Joined 2004
en.wikipedia.org/wiki/Censorship
From http://diyaudio.com/forums/showthread.php?postid=115702#post115702

halojoy said:
Thanks, I will see what he thinks.

I know I have been on that website once before.
Probably some year ago.
I recognize some of the names of the amplifiers.

Thius is some of what he, Kostas Metaxas AUS, has to say:

The most significant difference between VALVE and TRANSISTOR circuits is the amplifier/power supply regulator circuit interaction which is far more critical in Transistor circuits.
Click to expand...

In well designed Tube or transistor circuits, the ac gain will have nothing to do with the value of the supply rails.....easily demonstrated by using an active load....

Kostas' example is soooo flawed it beggers belief.... :bigeyes:

I suppose it goes to show you really don't need to know what you are doing to be succesful in the audio industry..... :(
 
H

HKC

Member
Joined 2003
After 5 years, I eventually finished my JC-2 clone. The sonic quality of my JC-2 is amazing. About 10 of my friends have listened to the pre-amp and they all give very positive comments to it.
I want to say thank you to you guys who gave suggestions and advices here.

Top view of the pre-amp:
 

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G

gk7

Member
Joined 2007
upgrade article from Positive Feedback

Hi HKC,

i just received a mail from Positive Feedback: "Sorry, we no longer sell or have back issues." Would you mind to send me a copy too ?
(Email: gk7@billrothhaus.at).
I own a ML-1 and one of the line modules recently started to make some crackling noise the first minutes during warmup, so it might eventually fail some time in the future. I plan to make replacement line modules (as close to the original as it is possible with modern parts, at least performance wise). The should fit in the original JC-2/ML-1 chassis of course, but would make a nice "building block" for other DIY line level applications as well, I believe.
 
john curl

john curl

Member
Joined 2003
I wish you well in making replacement modules for the JC-2, ML-1 preamps. I am just too old and tired to do it myself, but the need is there, and it is always a shame to see such a nice chassis discarded, because of lack of modules. I got a free JC-2 that way, but it was only valuable because I could fix it with pre-existing modules. Today, I am out.
 
G

GRollins

Member
Joined 2001
Anyone with a dead JC-2 can contact me. No, I won't repair it, per se, but I've always thought it was one of the most attractive preamps made and I'd love to build something into the chassis.
The basic circuit topology is still viable, but obtaining original parts is difficult and there are changes that could be made to update the thing to more-or-less modern standards. If I recall correctly the phono stage EQ is flawed--something I believe John would admit--although it can be tweaked to greater accuracy.
Hell, even if I don't build anything into it, I'd just like to have one around to look at.

Grey
 
G

gk7

Member
Joined 2007
HKC said:
It is very hard to found a JC-2 these days. One was selling @ USD3500.00 from Hi Fi Do Japan about 2 months ago.
Click to expand...

There are currently two ML-1 for sale on that well known internet auction house, but no idea what the final price will be. (I bought mine in good condition and fully working for approx. 1000 EUR one year ago.)
 
H

HKC

Member
Joined 2003
gk7 said:


There are currently two ML-1 for sale on that well known internet auction house, but no idea what the final price will be. (I bought mine in good condition and fully working for approx. 1000 EUR one year ago.)
Click to expand...

1000EUR is a good price. It was few months ago, a ML-1 from Australia auction house end up with USD3000 something.
 
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