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Old 12th November 2015, 06:31 PM   #1
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Default quad 50e speaker wiring

Hello all.
I have a pair of 55e .They came to me with u/s written on side so could have fault.

I have tried them out an both output sound ok but the large reisistor R32 gets hot.
It got to 95c in about 2 mins so I shut it off.
I wasn't sure if the way I connected the speaker was a cause.
I just connected it across pins 1 and 2.
Do I need to connect it like the diagram?
thanks
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Old 12th November 2015, 07:12 PM   #2
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Check MR5 for the overheating 180R resistor. Pay attention to the speaker wiring instructions.
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Old 12th November 2015, 07:46 PM   #3
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Default identify mr5

Thanks for that .
I am trying to find some data and am not sure what to search for.
I am not sure what nrs to seach so I can test it on my meter
thanks
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Old 12th November 2015, 08:20 PM   #4
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I de soldered it .
I have just connected in reverse bias with 12v through a 1.5k resistor and metered across it and it read 5.35v so It think its ok '
it also passed the dioded tst on my dvm ok
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Old 12th November 2015, 10:43 PM   #5
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There is an awful amount of voltage to drop across the 180R so maybe it is alright if the HT is correct at 28 Volts.
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Old 13th November 2015, 05:13 PM   #6
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Thanks Jon.
I have made up the proper wiring connection now and it is still hot.
The basic schematic says ht is 38v volts and I am getting 39 so thats ok.
Mr5 is working and measures 5.7 with respect to ground so its ok too .

When I powered it up for the first time I smelt that burning smell and that is how I discovered.
R32 hot.
The smell probably was just dust build up, I smell that smell when testing heaters that haven't been used for time regularly at work.diyaudio
I don't know what power rating the resistor is as my schematic does not show it, so I cant find out its max working temp.
The amp sounds ok so it could be normal
thanks
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Old 13th November 2015, 05:52 PM   #7
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I have been searching more and r32 is a an 8w ceramic 5% resistor,still not sure of its working temp though.
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Old 13th November 2015, 06:47 PM   #8
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Hello all.
I played chicken with it and let it run to see what it would max out at over 10 min.
R32 stabled out at about 175celcuis and mr5 at 80c.
It still sound ok though
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Old 14th November 2015, 08:06 PM   #9
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Hello all.
I have done a lot more research and so far I have set the bias and set the Emitter voltage of Tr3 to 5.5 volts.
I have also checked all the transistors with dvm and all were ok.
I have just ordered new nichicon caps for it
I put some better speakers on it and it does have a good sound
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Old 15th November 2015, 08:22 AM   #10
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Quote:
Originally Posted by intensate View Post
.................R32 stabled out at about 175celcuis and mr5 at 80c............
If the outside is at 175C, then what is the temperature of the resistive element?
What is the resistance at that unknown temperature?
What is the reliability at that temperature?
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