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Harman Kardon 630 Twin Powered - blazing a trail

Thomas Ryan said:
IMHO, hard to go wrong with Nichicon UKL for signal path applications.
Low leakage is less important in the main amp vs the phono EQ or preamp, but no harm.
The bummer is that these are phasing out with mostly only high voltage ones still available on DigiKey or Mouser.
I have stocked up as I could and wonder what we can use post-UKL for values > 6.8uF where film caps get too large.
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I've been looking into this a bit recently, since for the first time I'm having trouble finding ukl caps that I need. Based on some other posts and product info I'm leaning towards using this list right now, in order of preference. Just based on reading though, no practical experience with any of these myself yet other than ukl. I just ordered some ukz and ues caps for working on an hk 630 tone/preamp board.

ukl
ukz
ues
ufg
ufw, rubycon twl, silmic 2
 
Hi, does anyone have the service bulletin #165 they could upload here? I can only find it on HiFi Engine and other are no longer accepting new registrations.
 
Marking this to come back to as I pulled my 630 several months ago as it was acting up and I did not have time to figure it out (I am not super skilled, kinda beginner on restoring these things). I am going to pull it back out and recall what was going on, and start figuring it out from there. AFAIK, this unit had not been restored or updated at all.
IMG_6273.jpeg
 
Mumbles said:
After all these years, the volume/balance/bass/treble pots will most likely benefit from a DeOxit treatment as might the switches. Sometimes it can make a world of difference by cleaning and lubing the volume and balance pots alone.
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Yes, I did that before when I put this into service (see my other thread here so I don't dirty this one up too much https://audiokarma.org/forums/threads/harman-kardon-630-i-did-a-thing.918004/ ) but then just have used it for quite a while until it started acting up. I was in the middle of stuff and just swapped it out for a 570i I had just cleaned up and put it in my nice and dry garage a few months ago. Will re-do those things, and also start checking out other things when I take it out of the garage and pull it out of the wood case. I do recall thinking some of the caps were looking swollen so want to check that too. I may need to do that or get that done to be safe as well.
 
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