Quad CD 66

Praudio · 30th November 2007, 08:51 PM

The LM 833 output chips have been replaced by BB 2604 and those new 2604 run pretty hot. What I do now ?

wckong · 1st December 2007, 04:42 AM

Hi,
If you have installed with 8-pins sockets,which i used to do with my Philips cd 471 & 472, then i would like to suggest that you plug(insert) back the LM833 and see if they are hot too.
The next step, i suppose that you know what to tackle the problem...

Praudio · 1st December 2007, 04:00 PM

get an other unit with LM 833 out; running warm, not very hot like
BB2604

Mooly · 3rd December 2007, 03:49 PM

Hi
Although a bit unlikely, are they oscillating (At R.F.). Try a 0.1mf cap directly across supply pins(4 and 8 on Op-Amp)How hot is Hot?. Is the audio distorted ? OPA2604 draws around 12ma, at +/-15volt thats 0.36watts so yes it will be quite warm.
Regards Karl

Gasho · 3rd December 2007, 05:37 PM

OP-amps don´t runs hot in standard circuits. Only things that can make OP-amps hot are osclillations or pushing them in quasi A class.

OPA2604 on +/- 20V voltage are cool or just little warm.

30th November 2007, 08:51 PM	#1
Praudio diyAudio Member Join Date: Mar 2002 Location: Canada	Quad CD 66 The LM 833 output chips have been replaced by BB 2604 and those new 2604 run pretty hot. What I do now ? __________________ Praudio

1st December 2007, 04:42 AM	#2
wckong diyAudio Member Join Date: Jan 2007 Location: Hong Kong	Sockets installed ? Hi, If you have installed with 8-pins sockets,which i used to do with my Philips cd 471 & 472, then i would like to suggest that you plug(insert) back the LM833 and see if they are hot too. The next step, i suppose that you know what to tackle the problem... __________________ kingkong

1st December 2007, 04:00 PM	#3
Praudio diyAudio Member Join Date: Mar 2002 Location: Canada	get an other unit with LM 833 out; running warm, not very hot like BB2604 __________________ Praudio

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3rd December 2007, 03:49 PM	#4
Mooly diyAudio Member Join Date: Sep 2007	Hi Although a bit unlikely, are they oscillating (At R.F.). Try a 0.1mf cap directly across supply pins(4 and 8 on Op-Amp)How hot is Hot?. Is the audio distorted ? OPA2604 draws around 12ma, at +/-15volt thats 0.36watts so yes it will be quite warm. Regards Karl

3rd December 2007, 05:37 PM	#5
Gasho diyAudio Member Join Date: Nov 2004 Location: Zagreb	OP-amps don´t runs hot in standard circuits. Only things that can make OP-amps hot are osclillations or pushing them in quasi A class. OPA2604 on +/- 20V voltage are cool or just little warm.

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