Output transistors in halfer dh-200

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wrl

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Joined 2003
#1
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
 
#6
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
 
#7
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
 
#8
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
 
#13
Friends of mine, and myself, built several DH200 clones, with added DC servo, during the early 80-s. It can do well with more caps in the PSUand has good control over the bass region, but it's still a class-B amp, and as such cannot be compared with the Aleph's and others alike. I do beleive that the original DH200 actually used 2SJ48/2SK133,- but the J50/k135 will do the job, - as will 10N16/10P16 or the BUZ900/905.
The Exicon 10N16/10P16 is a cheaper alternative which seems to be OK judging by other peoples comments, but I have never used them. By specs only, they should be OK.

Changing the innards to a Leach is of course OK, but then it's a Leach...not a Hafler. BrianGTs rework of the Leach uses IRFPs ( I think??), whereas the original uses bipolars. So it will have to be one or the other, Hafler or Leach.
 
#14
I know I know, I never wanted to change the hafler into a leach. I ALREADY have a leach. 🙄

I was just wondering if they used the same output transistors. But this appears not to be the case.

Anyway, thanks for the replies I'll look into getting some new parts.

-Wes
 
#16
I am going to agree with Peter and others on this one, turning your hafler into a leech will be tricky. So you thinking of building a leach? dr. Leach has a great site on these amps, you may want to take a look. hear they sound great. 😉
 
#17
wrl said:
I know I know, I never wanted to change the hafler into a leach. I ALREADY have a leach. 🙄

I was just wondering if they used the same output transistors. But this appears not to be the case.

Anyway, thanks for the replies I'll look into getting some new parts.

-Wes
Click to expand...
Wes I have a couple of 2SK135/2SJ50 for sale in mint condition and even in their original box.
 
#18
Thanks for the offer peranders, I'm going to try and just repopulate the transistors and diodes of the boards (should be done in a couple of days) and use them with the original output transistors. If that doesn't fix it I would definitely be interested in what you have to offer. Should know in a few days.

Thanks,
Wes
 
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