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Old 22nd June 2008, 08:30 PM   #11
hifi13 is offline hifi13  Canada
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Quote:
Originally posted by Mooly
Hi,
Your keen posting all those . I will have a closer look tomorrow, but the TLO72 will be fine. You can go better still but these take some beating and are they stable in use. A lot depends on what the rest of your system is as to whether you feel the changes are worthwhile. Both the 5218 and 4558 are little better than 741 types so I would go ahead !
Have you ever unsoldered any I/C's before -- you need a good iron with a large (ish) tip (Not a poker) and some desoldering braid. I see the word "mute" on the PCB so it looks promising.
I will post again tomorrow all being well.
Regards Karl
What would be better than the TLO72's? Would I use TLO72 in both 5218 and 4558?
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Old 23rd June 2008, 06:57 AM   #12
Mooly is offline Mooly  United Kingdom
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Hi,
I have always had good results with the OPA2604. It does definitely sound musical. Having said that the TLO72 is still an excellent performer in applications like this. There are really dozens of types to choose from, but you need to be sure that they are what is called "unity gain stable". Looking at the pics of the PCB show they are connected with the output pin and inverting input joined ( gain of 1 or unity). If you have to order any make sure you get the 8 pin D.I.L. (Dual in line) type. Don't worry about any other letters after the number -- just that it is D.I.L.
IC502 is the final output I/C and Pin 1 and Pin 7 are the two outputs (left and right channels). Q501/502 and 551/552 appear to be mute transistors. Before you swap any I/C's try it with these removed and see if you can live with any switch on/off noises produced. Another thing I spotted is the supplies to the OpAmp. +/- 5 volts is a low value (nothing you can do about that) but that limits still further the choice of OpAmp. The two I mentioned will be fine on this. If you have a meter, with the player switched on but NO disc playing read the DC volts from the ground of the output sockets ( no other ground ) and pin 1 and pin 7 of IC502. It should be zero. If it really is zero to within say 5 or 10 millivolts you could try linking out the electrolytic coupling caps C503 and C553 that go to these pins.
Regards Karl

Edit You can use different I/C's in each location if you want to experiment as long as they are a suitable type.
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Old 23rd June 2008, 11:24 PM   #13
hifi13 is offline hifi13  Canada
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Join Date: Jun 2008
Quote:
Originally posted by Mooly
Hi,
I have always had good results with the OPA2604. It does definitely sound musical. Having said that the TLO72 is still an excellent performer in applications like this. There are really dozens of types to choose from, but you need to be sure that they are what is called "unity gain stable". Looking at the pics of the PCB show they are connected with the output pin and inverting input joined ( gain of 1 or unity). If you have to order any make sure you get the 8 pin D.I.L. (Dual in line) type. Don't worry about any other letters after the number -- just that it is D.I.L.
IC502 is the final output I/C and Pin 1 and Pin 7 are the two outputs (left and right channels). Q501/502 and 551/552 appear to be mute transistors. Before you swap any I/C's try it with these removed and see if you can live with any switch on/off noises produced. Another thing I spotted is the supplies to the OpAmp. +/- 5 volts is a low value (nothing you can do about that) but that limits still further the choice of OpAmp. The two I mentioned will be fine on this. If you have a meter, with the player switched on but NO disc playing read the DC volts from the ground of the output sockets ( no other ground ) and pin 1 and pin 7 of IC502. It should be zero. If it really is zero to within say 5 or 10 millivolts you could try linking out the electrolytic coupling caps C503 and C553 that go to these pins.
Regards Karl

Edit You can use different I/C's in each location if you want to experiment as long as they are a suitable type.

I can't thank you enough for all your help Mooly, I am off to take out the muting resistors, I will report back soon...
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Old 27th June 2008, 05:10 AM   #14
hifi13 is offline hifi13  Canada
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Default Update

Just finished removing the muting transistors and I have to say it really made a difference. Seems like more space around the instruments, more clarity, like someone wiped a dirty window and you can 'see' farther into the music, if that makes sense. I wasn't expecting a big difference, but to my ears there is a difference. Thanks to everyone and extra thanks to mooly for all your help. I am now off to try and find some op amps, hopefully I can find some in Canada near by. I will report back once I do. If I can't find any here can you recommend a good place to buy parts?
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Old 27th June 2008, 06:17 AM   #15
Mooly is offline Mooly  United Kingdom
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Good to here that. The OpAmps will make far more difference I suspect. Keep us informed
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