Output transistors in halfer dh-200

wrl · 12th December 2003, 08:36 PM

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

Netlist · 12th December 2003, 09:01 PM

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

audiofan · 12th December 2003, 09:20 PM

I dont know if this is reliable but.....may have some use

http://users.otenet.gr/~athsam/HAFLER_DH_200.htm

Netlist · 12th December 2003, 09:33 PM

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

Upupa Epops · 12th December 2003, 10:11 PM

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.

wrl · 13th December 2003, 01:30 AM

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

Tony · 13th December 2003, 01:57 AM

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

wrl · 13th December 2003, 04:24 AM

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

nickgreek · 13th December 2003, 04:33 AM

You can be replaced with [ 2SK1530 in the place of 2SK135 ] and [ 2SJ201 in the place of 2SJ50 ].

audiofan · 13th December 2003, 09:19 AM

link works for me from my home and from work

12th December 2003, 08:36 PM	#1
wrl diyAudio Member Join Date: Jan 2003 Location: USA	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 __________________ Anything worth doing is worth doing right... and redoing to make it better... and again to fix it back the way it was.

12th December 2003, 10:11 PM	#5
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	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.

13th December 2003, 01:30 AM	#6
wrl diyAudio Member Join Date: Jan 2003 Location: USA	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 __________________ Anything worth doing is worth doing right... and redoing to make it better... and again to fix it back the way it was.

13th December 2003, 01:57 AM	#7
Tony diyAudio Member Join Date: May 2003 Location: Palatiw, Pasig City	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 __________________ http://www.electronicslab.ph/forum/i...?topic=32688.0

13th December 2003, 04:24 AM	#8
wrl diyAudio Member Join Date: Jan 2003 Location: USA	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 __________________ Anything worth doing is worth doing right... and redoing to make it better... and again to fix it back the way it was.


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12th December 2003, 09:01 PM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	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

12th December 2003, 09:20 PM	#3
audiofan diyAudio Member Join Date: May 2003 Location: quebec	I dont know if this is reliable but.....may have some use http://users.otenet.gr/~athsam/HAFLER_DH_200.htm

13th December 2003, 04:33 AM	#9
nickgreek diyAudio Member Join Date: Jun 2002 Location: Germany	You can be replaced with [ 2SK1530 in the place of 2SK135 ] and [ 2SJ201 in the place of 2SJ50 ].

13th December 2003, 09:19 AM	#10
audiofan diyAudio Member Join Date: May 2003 Location: quebec	link works for me from my home and from work

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