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Old 12th December 2003, 08:36 PM   #1
wrl is offline wrl  United States
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Default Output transistors in halfer dh-200

Does anybody know if the output transistors are the same for the hafler dh-200 and the leach amp? Or if not would I be able to substitute those for the leach amp into the hafler.

I've had trouble finding the exact part # within the hafler documentation + I think the originals might be discontinued. Anyway, I'm planning on repopulating the hafler boards + had extra output transistors left over from my leach amp so it would be nice to swap those in as well.

Anybody know or have experience with this? (BrianGt maybe?)

Thanks
Wes
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Old 12th December 2003, 09:01 PM   #2
Netlist is offline Netlist  Belgium
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Did you look here?
hafler dh-200 rebuild
I didn't read the whole thread but saw that Nelson was involved there.
Not a bad place to start IMO.

/Hugo
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Old 12th December 2003, 09:20 PM   #3
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I dont know if this is reliable but.....may have some use

http://users.otenet.gr/~athsam/HAFLER_DH_200.htm
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Old 12th December 2003, 09:33 PM   #4
Netlist is offline Netlist  Belgium
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Quote:
Originally posted by audiofan
I dont know if this is reliable but.....may have some use
The link seems to be dead. Or is it me?

/Hugo
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Old 12th December 2003, 10:11 PM   #5
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Default Hafler

In this amp was used Hitachi 2SK 134 / 2SJ 49 ( two pairs in each channel ). If you can replace it, you may use BUZ 900 family.
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Old 13th December 2003, 01:30 AM   #6
wrl is offline wrl  United States
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Default yep saw the thread

I looked into that, but Nelson seemed to be hinting at replacing it with a Class A type circuit. As I want to drive electrostatic speakers with this amp I don't paticularly want to do this. Just a simple repopulation with new parts (keeping the transformer + filter caps the same).

"If you can replace it, you may use BUZ 900 family." I'm not familiar with those.

Maybe motorala transistors... cause I already have like 20 of these lying around...

Thanks,
-Wes
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Old 13th December 2003, 01:57 AM   #7
AJT is offline AJT  Philippines
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hi wrl,
afaik, the dh220 has mosfet output trannies so you can not use them for a leach amp....if you want to use the chassis and other hardware, you can build a leach4.5 lo-tim amp on that chassis using the motorola part that you have....is this your intent?
cheers,
tony
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Old 13th December 2003, 04:24 AM   #8
wrl is offline wrl  United States
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No, I already have a leach amp in a different chassis. I got a hafler off of e-bay that now doesn't work... stupid e-bay... anyway, it has good boards + psu so I was just going to repopulate. But I couldn't decifer from the manual what part #'s/brand the output transistors were.

Can I get these from on-semi?

-Wes
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Old 13th December 2003, 04:33 AM   #9
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You can be replaced with [ 2SK1530 in the place of 2SK135 ] and [ 2SJ201 in the place of 2SJ50 ].
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Old 13th December 2003, 09:19 AM   #10
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link works for me from my home and from work
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