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Old 11th June 2006, 02:57 AM   #1
ostie01 is offline ostie01  Canada
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Default SAE mk XXX1B transistor sub

HI, just mistype my last thread. Would like good sub transistors for the power amp SAE mk XXX1B. Service manual ask for SAE 103 and SAE 204. Number mark on transistor installed in the amp right now are 11-0064A and 11-0070A. Thanks for any advice.
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Old 11th June 2006, 03:25 AM   #2
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If these are the outputs I am pretty sure they are Power Darlingtons and may be hard to find......Used to repair SAE stuff years ago at Midwest Hi-Fi near Chicago.

Mark
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Old 11th June 2006, 04:39 AM   #3
ostie01 is offline ostie01  Canada
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HI, you're right, they are the output transistor, 2 pairs TO-3
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Old 11th June 2006, 04:47 AM   #4
ostie01 is offline ostie01  Canada
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HI, by looking at the schematic, those are not darlington transistors
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Old 11th June 2006, 08:20 AM   #5
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Quote:
Originally posted by ostie01
HI, by looking at the schematic, those are not darlington transistors
I worked in an SAE authorized service shop in New York when these were new. The outputs were definitely darlingtons.

I'll have to look at the schematic to see if I can suggest a replacement.

Mike.
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Old 11th June 2006, 08:32 AM   #6
ostie01 is offline ostie01  Canada
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Hi, thanks, here my address, just e-mail with a subject and I send you the schematic since I can't sent you personal message.

cubitus_61@hotmail.com
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Old 11th June 2006, 10:02 AM   #7
djk is offline djk
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Original parts were probably house branded 2N6059/2N6052, a 12A 100V 150W part, hard to find.

first choice:

Mouser

2N6284 TRANS DARL NPN 20A 100V 160W TO3 $3.84
2N6287 TRANS DARL PNP 20A 100V 160W TO3 $3.88

second choice:

Digi-Key

MJ11015 TRANS DARL PNP 30A 120V 200W TO3 $3.65
MJ11016 TRANS DARL NPN 30A 120V 200W TO3 $3.65 (non stock)
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Old 19th June 2006, 05:02 AM   #8
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SAEXXX1B issues:

ostie01,

Thanks for sending the schematic of the sae xxx1b

It would appear ths amp was blown up and one point and repair.

The actual fault I fixed was hum in one channel and I replace some electro capacitor on the input which helped.

However, some of the input diff transisters were odd types and I have replaced them with generci equivalents..

I note however one channel has odd bias of the darlington output stage of 0.01 while the other is 0.04 as stated in the schematic.

The voltage of the Q5 & Q 6 collector is 1.1 volt on one channel and about 0.114 volt on the other channel.

Both channel work functionally but I am stumped why these odd voltages and bias exist.

Any thoughts much appreciated

macka
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Old 21st June 2006, 12:02 AM   #9
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Okay,

I found out why the odd voltages from the drivers, one channel has a blown bias sensor SAE402.

I pulled apart the heatsink and what it is is a 17 pin UA3086PC transistor array. However I am not sure of that is the original part.

The original drivers the SAE801 and SAE 902 are also gone and it has 2n3440 and 2n 5416.

If anyone can advise what the badged pats were it would be appreciated

macka
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Old 21st June 2006, 12:14 AM   #10
ostie01 is offline ostie01  Canada
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Hi, the parts number of this transistor array on mine is CA3086. Just bought some of these parts from syracusesemiconductors on ebay, not expensive, only 0.40 each, I have one of these not working so still waiting for them, Jeff
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