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Old 11th May 2005, 02:15 PM   #1
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Default Which power device ?

Hello !

Can enybody help me to find the substitute for PT6068 and PT6067 power BJT ?

I've search the web but withowt any resoult. The mentionet BJT's are the power devices from an power amp from KÖERTING dated 1983. From the first look I think that they are darlington transistors (TO247 casing) because on the PCB are only TO92 transistors (aka BC547). The amp have a decent sound, rated 80W/4ohm. Power suply have 260VA transformer and 2x6800uF/40V.

Thanks for your help !

Cheers

Bostjan
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Old 11th May 2005, 07:20 PM   #2
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Here is a photo of the transistors.

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File Type: jpg transistors.jpg (99.6 KB, 228 views)
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Old 11th May 2005, 07:55 PM   #3
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You can order the originals for like $4 the piece in Germany.
Try Fibra Brandt or one of the others that sell old stuff.
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Old 11th May 2005, 08:46 PM   #4
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Thanks for the info. Do you maybe know some detail about this devices - maybe some beter (newer) replacement for them ?

Cheers
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Old 12th May 2005, 06:06 AM   #5
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I've chect the Fibra Brandt web page and they don't have the mentioned tranzistors. Do you have any other web page where I can chech for them?

Cheers
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Old 12th May 2005, 06:15 AM   #6
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Check the base emitter junction vltage drop with your meter on the diode range.

If they are around .7V then they are TIP35C/36C, if they are around 1.4V they are TIP142/147
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Old 12th May 2005, 06:23 AM   #7
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I've found the substitute. On the Maxi electronic forum (Slovenian forum) one of the members has the original schematic of the power amp. The substitutes are BDV64C and BDV65C. Thanks for your help !

Cheers

P.S. For djk

I cant check the voltage drop because the transistor are blown in a such way that between all the pins I dont get any voltage drop - all connections are open.
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Old 12th May 2005, 06:24 AM   #8
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The web page of the mentioned forum is Maxi.

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Old 12th May 2005, 07:18 AM   #9
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The BDV parts have the same specs as the TIP142/147 parts, a 10A 100V darlington.
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