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Old 1st May 2007, 06:20 PM   #6521
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sorry to go off-topic with unbridled enthusiasm but you couldn't prise the LM4562's outof my dead hands now that they have really settled in! (thanks again Malefedo) My '67 really sings now and it doesn't have even half the mods I have read here.
I'm so please with these opamps that they are taking pride of place in a Tripath amp being rebuilt for me (surrounded by a bevy of admiring Caddock mk132's to keep them company)
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Old 2nd May 2007, 12:31 AM   #6522
aquar is offline aquar  Indonesia
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Quote:
Originally posted by poynton



Hi

A strange result! It is unlikely to be around the opamps as they seem to be working.
Recheck the regulator output and wiring - there may be a partial short.

Andy
PS where do you live? I lived in Balikpapan for several years.

Hi Andy,
Terimakasih...... , I have been living in Samarinda since 1995, 150 km from 'oil city'. Now, I hear you will be going to NZ , oh you looks very busy but still have time for your marantz, great..

Hi Ray/Andy
I have checked again last nigt and seem ok for wiring and 317 input (16.10V), but I doubt the transistor (B547C) work unproperly, I will replace with a new one tonight.
Tks Ray, terimakasih Andy.

Regards
aquar
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Old 2nd May 2007, 07:50 AM   #6523
Luke is offline Luke  New Zealand
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Hi Andy,

check your mail

seeya ab
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Old 2nd May 2007, 11:24 AM   #6524
quan is offline quan  Australia
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Thumbs up marantz 67 mods

Hi guys-thanks for info-Brent/Simon

the solder pad on right op-amp socket was destroyed by me on the process of removing the old one-Doh!!!
i have ran the wire link the track together-now both chanel s have music but it seems the high frequency is missing and sound really closed in-just wonder does this thing need to break in again? how long would it take?
also- what would be a cost efficient voltage regulator to replace the 79M12/78M12? Quan.
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Old 2nd May 2007, 11:33 AM   #6525
SimontY is offline SimontY  United Kingdom
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Default Re: marantz 67 mods

Quote:
Originally posted by quan
Hi guys-thanks for info-Brent/Simon

the solder pad on right op-amp socket was destroyed by me on the process of removing the old one-Doh!!!
i have ran the wire link the track together-now both chanel s have music but it seems the high frequency is missing and sound really closed in-just wonder does this thing need to break in again? how long would it take?
also- what would be a cost efficient voltage regulator to replace the 79M12/78M12? Quan.
Hi Quan,

I'm glad you've got sound in both channels once more! When you say the HF sound is missing, are you talking about a definate technical problem or more a sound quality problem?

If anything the LM4562 would sound a bit bright initially. Possibly a touch less bright after settling down, warming up, running in...

Perhaps one of the filter caps you changed is the wrong value and is rolling off too much treble. Can anyone help with a part suggestion here?

Simon
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Old 2nd May 2007, 11:45 AM   #6526
quan is offline quan  Australia
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Hi Simon, iam not sure which cap to check- please advise. Thanks Quan
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Old 2nd May 2007, 11:50 AM   #6527
Thomo is offline Thomo  United Kingdom
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What is the dc offset of both channels now?

I agree with Simon, sounds like you have a cap in the wrong place.

I once changed the resistors and managed to swap the positions of a 10k and a 22k (i think) on one channel.

One channel sounded far duller than the other. Turned out that the problem channel was the one that sounded brighter.

I would check both channels and compare the component values to the schematic.

The caps around the op-amp btw.

Lee.
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Old 2nd May 2007, 11:56 AM   #6528
SimontY is offline SimontY  United Kingdom
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Quote:
Originally posted by quan
Hi Simon, iam not sure which cap to check- please advise. Thanks Quan
Unfortunately I don't know which it would be, hence my asking for help from others. If you look in the service manual you can check values of the small capacitors and the resistors around the op-amps. I noticed in your photos you've changed some of these and one or two looked like rather large caps (physically)...

Simon
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Old 2nd May 2007, 12:00 PM   #6529
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Well the larger the cap value (uF) the lower pass (Hz) they become.

Brent
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Old 2nd May 2007, 12:02 PM   #6530
quan is offline quan  Australia
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Default marant mod

Hi Simon-the output filter cap-original value is 100pF polystyrene but i could not find the smae component from Farnell in Australia thus i changed to Vishay 0.1UF polyester cap. , could this be the problem ?otherwise all the parts are as listed. Quan.
PS-still try to recover from this morning Liverpoolv Chelsea game.
The Dc offset are 22mV from both chanels now.
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