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Sorry upfront but I am a relative newbie and this is my first post.Loved my Harmon/Kardon 330c so much I bought a H/K 930 in pretty nice shape. I was slightly disappointed in the power output-not noticeably more powerful than the 330c! (20wpc vs. 50wpc I think)
I was thinking of trying to replace the 4 big capacitors near the power transformer thinking this might help. Unfortunately I can't seem to track down any 50V 6800uf Caps that are the same diameter and have no idea how I would attach them to the board.
Any advice at all? Should I even replace these? If so where can I get them? (tried Mouser)
HELP!!
Follow Ups:
I sold them back in the 70s along with ADS speakers.First of all, consider that power and perceived loudness is on a logarithmic scale. Doubling power only adds 3 db to the output level. I suspect what you really want is a 100 watt+ amp.
Replacing the caps might help because they are the first components to suffer from aging and yours are past the typical 30 year lifespan. As they dry up, they lose some capacity. I replaced the caps in my '81 Threshold amp for that very reason. If they really test fine, then simply adding more capacitance will usually not add any more power.
Depending upon the amp design, however, added capacitance can add more apparent bass slam and dynamics. Back in that day, I drove a pair of Magneplanar MG-IIs with an Audire power amp. I tripled the size of the power supply (via outboard box - Dyna 400 style) and upgraded the bridge. It was definitely a qualitative, if not quantitative improvement.
I am not a tech but it seems that replacing the caps would be a lot of trouble and expense for little noticable return.The difference in the apparent output of a well designed 20-25 watt amp versus a well designed 45 watt map(like the 930's)is not very obvious sometimes. I have had 2 930's (I still have one of them). They did not impress me anymore than the 730 or the 430 that I also have. I think it was more hype than any really significant increase in performance. If I had to choose only one receiver to keep it would be the 730. However,the 930 is a handsome beast! I think that it simply has a volume control that unloads it's power at a slower rate than others. It allows you to use the complete range that the pot has to offer it is just a little lazier up to the 12:00 position and perhaps even a little farther. Still a very nice receiver! Mine needs a little work that it will get soon. Good Luck! Franksta
nt
Dean.
I have had both the 730 and the 430. Both are excellent, and I opted to keep the 430 (the 730 had a few minor issues with it).I have seen the argument that the 730 is the best, and then I have seen some folks say the 430 is the best. Both are nearly identical in performance if you ask me. You just get the added convenience of two sets of inputs with the 730 (2 aux, 2 tape, 2 phono, etc.)
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