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Old 18th January 2006, 08:58 PM   #1
dw887 is offline dw887  United Kingdom
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Default Resistor for Audiolab 8000a

Hi

I have a problem with my Audiolab 8000a, which is the very early model with the 180 degree DIN sockets. The problem I have is with a resistor that I can't seem to source.

On the pcb it is situated just in front if the output transistors Q39 and Q41. It is a white 3 pin resistor and the marking on it are RGC33 - 0.22ohmKX2 - 32. Could somone with a bit of knowledge tell me what the wattage rating is for this component and also where I could get a hold of one. Other than that are there any suitable equivalents. I have a picture of the component at:Picture of resistor

Thanks

David
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Old 18th January 2006, 09:07 PM   #2
Steven is offline Steven  Netherlands
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2 times 5 Watt should be enough. Probably difficult to source such a double resistor, but you can as well use two separate ones.

Steven
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Old 18th January 2006, 09:57 PM   #3
dw887 is offline dw887  United Kingdom
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Hi Steven

Thanks for your response. Also could you verify that the output transistors fitted are the correct ones or at least a decent equivalent, they are 2 x BD911 and 2 x BD912.

Cheers

Dave
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Old 19th January 2006, 04:00 AM   #4
testlab is offline testlab  United States
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What you have ther is what we call yer Noble dual emitter resistor. They seem to be difficult to come by lately. They can probably be found at a distributor that deals replacement parts for consumer electronics. You might try Futurelec. Or, discrete resistor with a 5W ratting should be fine.
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Old 19th January 2006, 06:41 PM   #5
testlab is offline testlab  United States
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Found what you need here :
http://www.mcminone.com/category.asp...3829947&Page=1
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Old 19th January 2006, 06:52 PM   #6
dw887 is offline dw887  United Kingdom
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Hi testlab

Thats great, thanks for taking the time.

Dave
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Old 19th January 2006, 06:56 PM   #7
anatech is offline anatech  Canada
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Hi dw887,
Your original is a dual 3W, non-inductive. 5W is fine. The part testlab linked to is correct.

Don't use 5W "bathtub" style resistors. They are inductive and may cause you grief (oscillation). They also sometimes don't fit in the small space the original part takes up.

The 8000a schematic I have indicates 2SC4382 and 2SA1668 as drivers (same case style as your BD parts), 2SC2922 and 2SA1216 as outputs. Your version may be different, but I don't think it's that far different.

-Chris
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Old 19th January 2006, 07:08 PM   #8
dw887 is offline dw887  United Kingdom
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Hi Chris

Thanks you for the information. Have you had much experience in repairing the outputs on these amps? So far I have found:

Q38 - Short
Q39 - Short
Q40 - Short
Q41 - Short
Q31 - High Resistance
Q33 - High Resistance
Q45 - Short
Q49 - Short
Q47 - High Resistance
Q51 - High Resistance
Q35 - Short

And a 3 high resistance resistors.

If you have a pdf copy of the circuit it would be much appreciated.

Cheers

Dave
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Old 19th January 2006, 07:13 PM   #9
anatech is offline anatech  Canada
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Hi dw887,
Some advice. Don't substitute part numbers on this. It's going to be fun, but do-able. This amp does not forgive mistakes in repair.

-Chris
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Old 20th January 2006, 05:15 PM   #10
Steven is offline Steven  Netherlands
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Default 8000A

It has been posted earlier, but here it is again:

Steven
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File Type: png audiolab8000a.png (20.2 KB, 252 views)
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