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Kustom 250-4 [message #27628] Thu, 09 January 2020 12:23 Go to previous message
johnnysynth is currently offline  johnnysynth
Messages: 37
Registered: June 2018
Member
I'm rebuilding a Kustom 250-4 amp. It works but is noisey and distorts in the high end frequencies
with my Wurlitzer Electric Piano. Right now rebuilding the (2) preamp sections starting with
the 14pin dual op-amps XR4739/nte725 uA739
This part is not listed in Mouser or Digikey
Any clues on this or any other -hard to find- devices
in the pre-amp section?
I replaced the two 'big can' electrolytics already
in the pwr. supply and that brought the
idyl noise down considerable
That's as far as I've gotten
Jake Welsh
johnnysynth@yahoo.com
808 755-5886
Saint Augustine, FL
1/9/20
 
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