Resistor for Audiolab 8000a

dw887 · 18th January 2006, 07:58 PM

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

Steven · 18th January 2006, 08:07 PM

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

dw887 · 18th January 2006, 08:57 PM

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

testlab · 19th January 2006, 03:00 AM

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.

testlab · 19th January 2006, 05:41 PM

Found what you need here :
http://www.mcminone.com/category.asp...3829947&Page=1

dw887 · 19th January 2006, 05:52 PM

Hi testlab

Thats great, thanks for taking the time.

Dave

anatech · 19th January 2006, 05:56 PM

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

dw887 · 19th January 2006, 06:08 PM

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

anatech · 19th January 2006, 06:13 PM

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

Steven · 20th January 2006, 04:15 PM

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

Steven

18th January 2006, 07:58 PM	#1
dw887 diyAudio Member Join Date: Apr 2005 Location: Consett	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

18th January 2006, 08:07 PM	#2
Steven diyAudio Member Join Date: Oct 2003 Location: The Netherlands	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 __________________ The Analog Art shows no sign of yielding to the Dodo's fate. The emergence and maturation of monolithic processing finesse has perhaps lagged a bit behind the growth of the Binary Business. But whereas digital precision is forever bounded by bits, there is no limit excepting Universal Hiss to the ultimate accuracy and functional variety of simple analog circuits. - Barry Gilbert, 1973

19th January 2006, 03:00 AM	#4
testlab diyAudio Member Join Date: Dec 2005 Location: Grand Rapids MI	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. __________________ It's not whether you win or lose, it's how you lay the blame.

19th January 2006, 05:41 PM	#5
testlab diyAudio Member Join Date: Dec 2005 Location: Grand Rapids MI	Found what you need here : http://www.mcminone.com/category.asp...3829947&Page=1 __________________ It's not whether you win or lose, it's how you lay the blame.

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18th January 2006, 08:57 PM	#3
dw887 diyAudio Member Join Date: Apr 2005 Location: Consett	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

19th January 2006, 05:52 PM	#6
dw887 diyAudio Member Join Date: Apr 2005 Location: Consett	Hi testlab Thats great, thanks for taking the time. Dave

19th January 2006, 05:56 PM	#7
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	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

19th January 2006, 06:08 PM	#8
dw887 diyAudio Member Join Date: Apr 2005 Location: Consett	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

19th January 2006, 06:13 PM	#9
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	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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