OFF - FOR SALE: Mapletree Audio Ultra 4A Preamplifier
Item #649450982Info: Mapletree Audio Ultra 4A Preamplifier
|Days in System:||14|
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Mapletree Ultra 4A preamplifier.
I'm the second owner. I have owned it for a year or so.It sounds great, but is susceptible to emr from my well pump, so am going passive.
I have replaced the power supply smoothing capacity with a lower value 50 microfarad cap following Lloyd Peppard's recommendation.I have the original 100 microfarad. I have also bypassed the the balance control and have reworked the volume control in shunt mode using Vishay Z-foils.This can be easily reversed if desired, although I highly recommend this modification.
The preamplifier comes with the standard tubes as supplied, although upgraded tubes are available - see my other ads.
Please let me know if you have any questions.
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