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Old 27th June 2010, 11:11 PM   #1
jtubio1 is offline jtubio1  Argentina
diyAudio Member
Join Date: Jun 2010
Default Obsolete Transistor Replacement

Hi: Anybody know any replacement for BDX 66 C and BDX 67 C Darlington
transistors?. My old amplifier and here, in Argentina, there are not
more of this ones.
By the way, please advice is agree for DIY construction 100 / 120W
final amplifier the good quality.
Diyaudio is fantastic.

Thank you all in advance, Jorge
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Old 27th June 2010, 11:24 PM   #2
wahab is offline wahab  Algeria
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Join Date: Nov 2009
Location: algeria/france
Rather difficult to find audio TO3 metal case devices ,
moreover if they are darlingtons type like these ones,
with good caracteristics.

You can try plastic cases TOP3 BDV64C/65C
if you cant find metal case equivalents..
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Old 28th June 2010, 02:33 AM   #3
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jackinnj's Avatar
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
slim pickins' in TO-3 Darlingtons. The TIP142,7 - etc. can be jigged into place, and work quite reliably.
Praeferendam optionem pro pauperibus non importet statum potiores
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Old 28th June 2010, 08:01 AM   #4
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east electronics's Avatar
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Location: Athens GREECE
MJ11015-16 will be a very rowbust replacement
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Old 28th June 2010, 11:40 AM   #5
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Join Date: Jul 2005
Location: D-55629 Schwarzerden
two years ago I have order this types by farnell for repair a German power amp, brand "Kücke" (KS-Electronic, "Select" series), typ "E42" (see attached pictures of this model - it was the successor of "E41").
I guess, CPC-Farnell still offer this types - here some URLs about Farnell and an other:
Semiconductor: BDX66C (BDX 66C) - 20SI-P-DARLINGTON 100V / 16A / 150W
Semiconductor: BDX67C (BDX 67C) - NPN - DARLINGTON / 120V / 16A / 150W...
The electrical difference between E41 and E42 was only the amount of output power devices: 2 pairs vs 3 pairs.

BTW - he associated pre-amplifier V32 looks also nice:
KS-Kuecke V32, Preamplifier

What is your amplifier brand/model?
Attached Images
File Type: jpg Kücke power amp E41 schematic.jpg (69.4 KB, 124 views)
Attached Files
File Type: pdf Kücke E42 front.pdf (44.5 KB, 35 views)
File Type: pdf Kücke E42 rear.pdf (52.1 KB, 22 views)
File Type: pdf Kücke E42 bottom.pdf (134.8 KB, 20 views)
File Type: pdf Kücke E42 select series top-front.pdf (39.4 KB, 25 views)
File Type: pdf Kücke E42 data sheet.pdf (161.2 KB, 30 views)

Last edited by tiefbassuebertr; 28th June 2010 at 11:59 AM.
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Old 28th June 2010, 11:16 PM   #6
jtubio1 is offline jtubio1  Argentina
diyAudio Member
Join Date: Jun 2010
Default Obsolete Transistor Replacement

Dear frieds: Thank so much for all. I am looking for this replacement, then, I tell us what result.

Thank again, Jorge
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