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In Reply to: RE: BAT VK75SE, Bring back its reputation posted by Eric Chan on March 20, 2015 at 19:21:02
My VK42SE is just about 10 years old. What's the chances of having capacitor failure or other issues? What's the cost to have BAT replace old innards?
The 42se runs warmish but nothing like the tubed 50se that ran HOT.
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The 42SE has been in production since 2006. Since then, about 10 units came back to the factory for various reasons, including the damages. None required a capacitor replacement.I don't remember exactly when Jensen redesigned the seal, but by memory it was about 10 years ago.
Edits: 03/25/15
I am not sure if the leakage has anything to do with voltage applied on two ends of the oil coupling, the cap used in VK75SE is 690V which is very high indeed
The voltage across the cap in BAT preamp is much much lower, also, as described by Victor , the later production for the oil cap have better construction that prevent leakage
The voltage is not an issue, as all the parts operate well within their ratings, with room to spare. The issue is sometimes application specific. In preamps the capacitor electrical leakage will produce an audible effect - a pop. There is no such thing in the power amps.Out of curiosity, I looked at the repair records for VK-60 - the first model using this basic topology, with some units 20 years old by now.
I looked at the factory repair records for the past 10 years. During that time we serviced about 60 units. And among them I counted 7 (seven) cases of various capacitor issues. 4 were bad Jensen capacitors, the others were various other parts.
Now, let's do a simple math. By a quick count, there are about 50,000 different capacitors in the VK-60 amps in use today. Of that number, over the period of 10 years, 7 needed replacement. Certainly, the factory repair records do not capture every case, but that should still give you some idea about the extent of the problem.
It kinda looks to me that the "idea" of hot running inferior parts inside those chassis is sort of out of luck. Not much proof of low quality parts there.
Edits: 03/25/15
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