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Old 15th May 2010, 03:06 PM   #1
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Default Substitute for 2SC3421/2SA1358 Drivers

These will be driving NJW0281/NJW0302 outputs on a 70 w amp. The original outputs were Sanken 2SC3855/2SA1491, bdent has them, but not in matching hfe groups, so I'm going with the ON Semi subs which look quite good. Would BD139/BD140 be my best match here?
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Old 15th May 2010, 03:51 PM   #2
AndrewT is offline AndrewT  Scotland
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the 1358 is quite a nice driver.
There are literally hundreds of alternatives out there that could be substituted.

If the amp has low voltage supply rails then you might get away with the bd, but they are not equivalent. I would not use them.
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Old 15th May 2010, 04:11 PM   #3
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better SOA and most others specs as well
avail in USA in best Y grade

KSC2690/2690A
KSA1220/KSA1220A
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Old 15th May 2010, 05:44 PM   #4
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The KSC2690/KS1220 look the ticket. Rail voltage is 50V. Thanks all.
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Old 16th May 2010, 11:47 AM   #5
AndrewT is offline AndrewT  Scotland
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Check that rail voltage.
70W into 8r0 and +-50Vdc does not equate, unless they have made so many price cuts that they have ruined the performance.
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Old 16th May 2010, 10:43 PM   #6
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The unit in question is a Denon PMA-520, the schematic is here:

4shared.com - document sharing - download pma520.pdf

It is suitable for 6 ohm speakers and sounds surprisingly good. I am currently using it with Snell KIII speakers, have had NHT and Paradigms on it also, always have been pleased. Not "high end", but most definitely among the better commercially available amps I have heard.

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Check that rail voltage.
70W into 8r0 and +-50Vdc does not equate, unless they have made so many price cuts that they have ruined the performance.
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Old 17th May 2010, 07:58 AM   #7
AndrewT is offline AndrewT  Scotland
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instead of that, what about measuring the rail voltage?
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Old 17th May 2010, 07:59 AM   #8
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Quote:
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Check that rail voltage.
70W into 8r0 and +-50Vdc does not equate, unless they have made so many price cuts that they have ruined the performance.
Think what it will do for the clipping performance and rail sagging, I also use slightly higher rail voltages for some of my amps.

Last edited by homemodder; 17th May 2010 at 08:02 AM.
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Old 17th May 2010, 08:51 AM   #9
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Think what higher voltage smoothing caps and a smaller size power transformer will do for the total shipping weight.
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Old 17th May 2010, 11:20 AM   #10
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The filter caps are 6800x4 56V. Maybe the amp's rail voltage was designed around the filter cap's "left over from another job" voltage? :0|
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