Okay, here's the story. I was at Linn dealer the other day and I overheard two guys (strangers to me) discussing the older Linn power amps. One guy was lamenting the fact that he could not find a larger older Linn power amo for his application. He had "only" a pair of LK85s. The other guy pipes up and says "Why not modify the LK85s into LK140s? It would be quite easy since they're both almost identical". Now, I am in a similar boat - I have an LK85 and I wish it had a bit more "grunt" to drive a pair of old Dynaudios I really like. I have had my amp open to examine the innards, and there isn't much in there. Lots of room. So just what are the differences between the two? Is what this "Expert" said true? Can an LK85 be modified to make more power? It would surely make life easier for me because trying to find a nice LK140 now-a-days is like trying to find a fish that can ride a bicycle - very difficult.
Over to you ;-)
Over to you ;-)
You aren't the first person looking for details about these 2 models.
http://www.diyaudio.com/forums/solid-state/197096-linn-lk85-lk-85-lk140-lk-140-schematic-needed.html
The problem with accurate info. about Linn and many other specialist audio manufacturers' products, is the unavailability of free schematics on the net. The Linfo website is locked down with limited access restrictions and this means that non-authorized service people, like many folk here, can't easily view even historical models to offer technical comment or suggestions.
The comments overheard about the similarity of the models may be correct in principle but I would not assume that it's just a few minutes work with a soldering iron and a handful of parts to up-rate the amplifier. Starting with doubling the number of chip amps (this looks to be a chip based ampliflier), it's likely that a new transformer, with other and additional adjusted value components will be needed for the likely bridging circuit components. That may amount to a substantial cost.
http://www.diyaudio.com/forums/solid-state/197096-linn-lk85-lk-85-lk140-lk-140-schematic-needed.html
The problem with accurate info. about Linn and many other specialist audio manufacturers' products, is the unavailability of free schematics on the net. The Linfo website is locked down with limited access restrictions and this means that non-authorized service people, like many folk here, can't easily view even historical models to offer technical comment or suggestions.
The comments overheard about the similarity of the models may be correct in principle but I would not assume that it's just a few minutes work with a soldering iron and a handful of parts to up-rate the amplifier. Starting with doubling the number of chip amps (this looks to be a chip based ampliflier), it's likely that a new transformer, with other and additional adjusted value components will be needed for the likely bridging circuit components. That may amount to a substantial cost.
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