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Which differences between Mark Levinson's "JC-1" and "JC-1DC"
Which differences between Mark Levinson's "JC-1" and "JC-1DC"
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Old 30th November 2014, 01:30 PM   #11
tiefbassuebertr is offline tiefbassuebertr  Germany
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In general you are right, but in case of the JC1DC the showed circuit works very fine without transformer with center tap.
I want still to know the differences between the "JC-1DC" and the "JC-1" head amp module. Still no informations?
Where is the developer of both models?
From the JC-1 module I still haven't the internal circuit.
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Old 17th August 2018, 09:50 AM   #12
tiefbassuebertr is offline tiefbassuebertr  Germany
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Quote:
Originally Posted by tiefbassuebertr View Post
Both versions are for operating without mains power supply - just two secondary D-cells are in use.
What is the difference ?

BTW - the mains supply version uses the additional term "AC"
The difference is the year of release - the suffix "DC" means a newer series (release 1976) than the older series without that suffix (release already 1974) go to
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Who know the difference between the gain stage circuits of this both versions ?

The schematic of the JC-1DC (potted version), which I have create some years ago, you will find here:
Mark Levinson JC-1DC_ckt[1].
Maybe there is also a schematic of the JC-1 anywhere. The last both pictures are from a device in not worked condition at left channel - unfortunately also in a potted version. The replace of electrolytic capacitors by new ones don't provide the wanted success.
Attached Images
File Type: jpg JC-1DC bottom view ser.-No 350.jpg (112.1 KB, 120 views)
File Type: jpg JC-1DC PCB solder side ser.-No 350.jpg (178.3 KB, 118 views)
File Type: jpg JC-1DC top-view ser.-No 350.jpg (148.7 KB, 117 views)
File Type: jpg JC-1DC PCB component side.jpg (172.4 KB, 117 views)
File Type: jpg JC-1DC PCB solder site ser.-No 703.jpg (174.5 KB, 114 views)
File Type: jpg JC-1DC Sticker ser.-No 703.jpg (160.0 KB, 34 views)
File Type: jpg JC1-DC top view ser.-No 703.jpg (179.8 KB, 17 views)
File Type: jpeg JC-1 #1764 old caps.jpeg (247.5 KB, 38 views)
File Type: jpeg JC-1 #1764 new caps.jpeg (422.9 KB, 41 views)
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Old 18th August 2018, 10:41 PM   #13
kevinkr is offline kevinkr  United States
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Which differences between Mark Levinson's "JC-1" and "JC-1DC"
Why don't you ask John Curl directly? He's a very active member here and might still remember what if anything is different between the two.
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Old 19th August 2018, 12:41 AM   #14
stellavox is offline stellavox  United States
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Guys,

As I remember, the DC simply stood for battery power.

Charles
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Old 20th August 2018, 10:42 AM   #15
Hans Polak is offline Hans Polak  Netherlands
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The circuit below is also a JC design.
Maybe this was the version used in the JC-1.
This one shows 2 transistors plus two emitter resistors, but to lower the noise, JC used 8 transistors with eight emitter resistors in parallel.


Hans
Attached Images
File Type: jpg Curl4.jpg (141.7 KB, 41 views)
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Old 29th August 2018, 08:28 AM   #16
tiefbassuebertr is offline tiefbassuebertr  Germany
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Quote:
Originally Posted by stellavox View Post
Guys,

As I remember, the DC simply stood for battery power.

Charles
yes, but both versions are battery powered working versions.
Quote:
Originally Posted by Hans Polak View Post
The circuit below is also a JC design.
Maybe this was the version used in the JC-1.
This one shows 2 transistors plus two emitter resistors, but to lower the noise, JC used 8 transistors with eight emitter resistors in parallel.
Hans
If you are right, the different between "JC-1" and JC-1DC" is large. The input signal is fed in at the base, like iFi iphono2 - go to
iFi Audio Model "micro iPhono2": Creating Schematic - help needed
and not at the emitter like the JC1-DC (go to the attached image).
Attached Images
File Type: png ML JC1-DC gain stage.png (88.5 KB, 19 views)

Last edited by tiefbassuebertr; 29th August 2018 at 08:41 AM.
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