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ARC SP16 preamp Clone
ARC SP16 preamp Clone
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Old 17th November 2019, 09:36 AM   #1
Adams_Leo is offline Adams_Leo  China
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Default ARC SP16 preamp Clone

Hello every one,I plan to only clone the ARC SP16 Preamp,which MOSFE can be used for the Q1(1036)? is there any way to use a tube for this ccs? any comments or suggestion.Really appreaciate.
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File Type: pdf SP16L SchemPL.pdf (446.6 KB, 51 views)

Last edited by Adams_Leo; 17th November 2019 at 09:45 AM.
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Old 17th November 2019, 09:40 AM   #2
Adams_Leo is offline Adams_Leo  China
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found another idea wich using the 6BH6 build the CCS. can I use the ccs to replace ARC SP16 Preamp Q1(1036) CCS?
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Old 17th November 2019, 10:16 AM   #3
analog_sa is online now analog_sa  Europe
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ARC SP16 preamp Clone
A number of depletion mosfets like the DN2540 will work fine. And so will a pentode. R36 will obviously need to be adjusted.

But why clone a preamp which was never known to sound any good? Even ARC themselves saw a bit of light and moved onto higher current, nfb free circuits.
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Old 17th November 2019, 11:15 AM   #4
Adams_Leo is offline Adams_Leo  China
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thanks ,just want to try it.Never build a preamp like the differential amplification.I would like to use 12ax7 Parallel connection cathode output
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Old 17th November 2019, 12:30 PM   #5
analog_sa is online now analog_sa  Europe
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ARC SP16 preamp Clone
The Reference series are also differential but better sounding.
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Old 17th November 2019, 02:27 PM   #6
denny9167 is offline denny9167  United States
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Quote:
Originally Posted by Adams_Leo View Post
Hello every one,I plan to only clone the ARC SP16 Preamp,which MOSFE can be used for the Q1(1036)? is there any way to use a tube for this ccs? any comments or suggestion.Really appreaciate.
Your on the right track, below is an example of a similar setup using 6SN7’s this arrangement sounds fabulous, if you want to stick to 9-pin tubes I would use a 6CG7, use a MOSFET as a sub for the cathode follower.
And LM334 as a ccs.


The gain is adjustable as well.
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Old 17th November 2019, 02:32 PM   #7
denny9167 is offline denny9167  United States
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Quote:
Originally Posted by analog_sa View Post
A number of depletion mosfets like the DN2540 will work fine. And so will a pentode. R36 will obviously need to be adjusted.

But why clone a preamp which was never known to sound any good? Even ARC themselves saw a bit of light and moved onto higher current, nfb free circuits.
Quite agree, I see one problem on first glance with their scheme, the first triode needs a coupling capacitor after the 300K load resistor, over time their would be a tendency for the circuit to start motor boating!
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Old 19th November 2019, 12:41 AM   #8
Adams_Leo is offline Adams_Leo  China
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Originally Posted by denny9167 View Post
Your on the right track, below is an example of a similar setup using 6SN7ís this arrangement sounds fabulous, if you want to stick to 9-pin tubes I would use a 6CG7, use a MOSFET as a sub for the cathode follower.
And LM334 as a ccs.


The gain is adjustable as well.
Is there any obvious differences between 6SN7 and 12AX7 for the input
differential amplification. can we use tube as ccs to replace for the LM334
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Old 19th November 2019, 01:03 AM   #9
denny9167 is offline denny9167  United States
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Quote:
Originally Posted by Adams_Leo View Post
Is there any obvious differences between 6SN7 and 12AX7 for the input
differential amplification. can we use tube as ccs to replace for the LM334
Huge difference in tubes, two different beasts, the 12AX7 requires much more feedback to achieve a reasonable gain for a line stage, and the 6SN7 is a much more linear tube to boot.


You definitely could use a tube for ccs, but you would have an additional heater supply, and a much larger negative bias to worry about and I don’t know if it would perform, or sound any better!

Last edited by denny9167; 19th November 2019 at 01:07 AM.
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Old 19th November 2019, 03:25 PM   #10
cygnus x1 is offline cygnus x1  United States
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How about a 6SL7 (as in the Octal Cornet)?
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