i have a harman kardon hk 630 amplifier and it has the following fitted
NE5332AN
4556AD
AD712JN
5532D
this amp is going to have a major overhaul of recapping and component replacement so i would like some advice as to suitable modern replacements for the above, all comments appreciated good and bad, i will be driving a set of B&W 8ohm speakers, i dont want to make any great changes to the circuit as room on the pcb will be tight.
NE5332AN
4556AD
AD712JN
5532D
this amp is going to have a major overhaul of recapping and component replacement so i would like some advice as to suitable modern replacements for the above, all comments appreciated good and bad, i will be driving a set of B&W 8ohm speakers, i dont want to make any great changes to the circuit as room on the pcb will be tight.
The 4556 sounds like it might be a headphone output. If so its ideally suited.
The 5532 are decent enough. Replacements could be the LM4562 (the 5532's successor) or go for a total change and try something like an OPA2604. Why not try fitting sockets and then you can try for yourself.
The AD712 is a cooking grade FET device. Is it used as a DC servo ? If it is then its perfect for the job. I wouldn't attempt to replace this without knowing what it does.
The 5532 are decent enough. Replacements could be the LM4562 (the 5532's successor) or go for a total change and try something like an OPA2604. Why not try fitting sockets and then you can try for yourself.
The AD712 is a cooking grade FET device. Is it used as a DC servo ? If it is then its perfect for the job. I wouldn't attempt to replace this without knowing what it does.
I suggest to do the re-capping first and in stages before changing active devices. Start with the power supply, use the dim bulb tester to start with after service work. As far as ecaps, if you can replace with a film type, go that root or place small films in parallel with larger ecaps that are in the signal path. Panasonic ECQ-V are a cheap alternative to small ecaps.
No SM on hifiengine, so limited specific advise, so use normal re-build procedures.
There is nothing wrong with the sound from a 5532(A) device.
No SM on hifiengine, so limited specific advise, so use normal re-build procedures.
There is nothing wrong with the sound from a 5532(A) device.
Hi, thank you, it will not be my first rebuild, about 4 months ago i did another harman it was the PM625 and the recapping made such a difference to performance, i used only panasonic low esr caps throughout and the pcb was given a good resolder (remove old first) and the output stage which had a overflow of solder on the tracks all the old solder was removed and new leaded solder added, the plugs/sockets were all removed and resoldered, i now have one great sounding amp.
The 630 is a different kettle of fish as it has had moisture damage to the main board and a lot of components are going to be lifted to get to the pcb so a good clean can be done, by the way dont suppose you know where i can get a service manual for it, dont forget its an amp and not the reciever which is well known, i have tried all the usual places even paid for sites but when asked about the manual they are all coming back with the wrong one so until a manual is found then the project will be put on hold for obvious reasons.
The 630 is a different kettle of fish as it has had moisture damage to the main board and a lot of components are going to be lifted to get to the pcb so a good clean can be done, by the way dont suppose you know where i can get a service manual for it, dont forget its an amp and not the reciever which is well known, i have tried all the usual places even paid for sites but when asked about the manual they are all coming back with the wrong one so until a manual is found then the project will be put on hold for obvious reasons.
There is usually no problem cleaning a PCB in situ, something I've done hundreds of times as a repair tech. Foam cleaner and soft brush followed by hot water rinse and thorough drying.
Can't suggest anywhere new for a manual I'm afraid.
Can't suggest anywhere new for a manual I'm afraid.
If You don't want transistor sound, use fast amos like LM 61xx serises, and put at least 2200 uf panasonic FC caps right at ompamos' pins. 5532 is way too slow - for my ears.
Hi,
Hifiengine.com lists alot of user and service manuals.
Among them HK620 640, 6300, 6350, just not the 630.
Wonder though that all models, smaller or bigger, older or younger don´t use OPAmps but are pure diskrete designs.
Found the manual here (first hit on Google!):
http://elektrotanya.com/harman-kardon_hk-630.pdf/download.html
Its a Receiver zhough and a purely discrete design also.
You´re sure You´ve got a HK630 on Your table?? ;-)
jauu
Calvin
Hifiengine.com lists alot of user and service manuals.
Among them HK620 640, 6300, 6350, just not the 630.
Wonder though that all models, smaller or bigger, older or younger don´t use OPAmps but are pure diskrete designs.
Found the manual here (first hit on Google!):
http://elektrotanya.com/harman-kardon_hk-630.pdf/download.html
Its a Receiver zhough and a purely discrete design also.
You´re sure You´ve got a HK630 on Your table?? ;-)
jauu
Calvin
Last edited:
Hi Calvin, yes i am sure its an amplifier here is a link to a review Harman Kardon 630, i am at the stage of downloading every hk amp and comparing the boards but up to now no luck.
Mooly thank you, the main board is a mess (challenge) if i as much as touch it with a brush stuff start falling off, its had liquid damage of some sort then been stored in a field or a barn, i have removed a lot of the larger components but as for the resistors etc the only option is replace, i would like to rebuild it if i could but its starting to look like i might not get there... still hoping
Mooly thank you, the main board is a mess (challenge) if i as much as touch it with a brush stuff start falling off, its had liquid damage of some sort then been stored in a field or a barn, i have removed a lot of the larger components but as for the resistors etc the only option is replace, i would like to rebuild it if i could but its starting to look like i might not get there... still hoping
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