Classe DR-25 transistors

[mrprytz]

I got a Classe DR-25, two of the output transistors died in battle some time ago.
The problem is that the print on the TO-3 is sanded down!?!?!.

The distributor in Norway does not keep schematics. And the service facility in Denmark (Audionord) won’t send it to me.

Does any one got schematics or part info?

[Zero Cool]

I was able to get schematics and parts right from the Classe factory for the DR-15 i rebuilt. Maybe you can email them??

I have schematics for the DR-3, 9 and 15 but not 25

Email me at tetech2@doitnow.com and i can email you what i have


Zc

[KBK]

oo..nice. Me get too? I suspect they may be the same transistor on any of the higher voltage rail units. Dave Designed all of them IIRC, so it is likely.

There is DR-25 information here:

http://www.diyaudio.com/forums/showt...postid=1598291

[Roar Malmin]

You can safely assume that MJ15024 and 25 will do the job.

Regards
Roar

[Zero Cool]

I have the bias procedure! its pretty simple.

[Classe DR-9]

My DR-9 manual shows MJ15024 (NPN) and MJ15025 (PNP).

[Classe DR-9]

Originally posted by Zero Cool
I was able to get schematics and parts right from the Classe factory for the DR-15 i rebuilt. Maybe you can email them??

I have schematics for the DR-3, 9 and 15 but not 25

Email me at tetech2@doitnow.com and i can email you what i have


Zc

How much of a manual for the DR-9 did you get, on my first attempt I got 6 pages, a partial schematic of the left channel, a handwriten page that has the bias numbers for several amps in the DR series and 4 pages on how to change the mains voltage.

On my second attempt I got something that Classe calls a service manual, it's 11 pages with a little more info. (maybe all that they'll release to the public?)

Thanks.

[Glen B]

I honestly don't think it is that they aren't releasing information on the legacy models to the public, it seems more like they haven't been diligent in maintaining older documentation, particularly the Dave Reich era stuff. I've had no problem obtaining whatever service documentation they have. In my experience, customer service/tech support has always been very cooperative in that regard. Some of what I've received has been very thorough, and at the same I've also received the one-page documentation with the hand-written notations or schematics with pages missing.

[Classe DR-9]

They've been very friendly and helpful in every conversation, they really suggested sending the amps back for service but with the price of shipping and the way customs works........

Their position was they didn't need more documentation as the people that work on them have been there for years........ people only live so long though........

Thanks

[mrprytz]

thanks, will try the MJ15024 and 25.

and yeah, maybe more likely that the people that WEHRE most into the legacy stuff actually are retired or something. and that may be the reason for not "releasing" the schematics.