Re: Kurzweil k2500 rack sounds

I have two K2500RS units and two K2600RS units which I purchased as "base" units and maxed them out. I used Radek's custom ROM replacements and PRAM expansions:
 

 http://sampler-expansions.dxp.pl/ http://sampler-expansions.dxp.pl/
 

 His ROM board contains all three ROM expansions for the K2500 -- Piano, Orchestral and Contemporary -- all on a single board, and his P/RAM expansion at US$85 is a steal.
 

 https://groups.yahoo.com/neo/groups/KurzList/conversations/messages/28167 https://groups.yahoo.com/neo/groups/KurzList/conversations/messages/28167
 

 Another really good resource is Alex Goetsman, who occasionally posts here and has many eBay auctions for K2500/K2600 parts. His email address is keyboardnj (at) gmail (dot) com (trying to fudge around Yahoo's bizarre filter...) Alex has been a real champ for me when coming up with parts for the Kurzweils.

 

 The units I spent the most time and effort refurbing were the K2600s, which I documented here as much as I could:

 

 https://groups.yahoo.com/neo/groups/KurzList/conversations/messages/30985 https://groups.yahoo.com/neo/groups/KurzList/conversations/messages/30985
 https://groups.yahoo.com/neo/groups/KurzList/conversations/messages/30986 https://groups.yahoo.com/neo/groups/KurzList/conversations/messages/30986
 

 As has been mentioned, it's a good thing to replace the stock fan with a Noctua (or two).
 

 Probably the most "bang for the buck" upgrade for the K25XX series is the KDFX option, just be prepared as it's a detailed install that requires adjusting voltages on the power supply. The sampling option -- it's great in that it provides a good digital output, but I've never actually used them as intended. 

 

 Another good thing to do with the K2500R is to refurbish the power supply by replacing the 2 4700uF and the big 33000uF cap. Look for any signs of swelling on the tops of these, and if there is any visible "dome", that's an indication you need to replace them soon.

 

 Good luck!