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With that being said, the hum on the Rhapsody was definitely more noticeable then on the Stardust when on Line (House) Power… It was also confirmed by my dealer that my particular Stardust does have the ground loop isolator kit installed, which was added after production to reduce the amplifier hum…ĭuring the testing of the UPS Battery backups on the Rhapsody I noticed that when you killed the Line power to the organ while it was powered up, the Amplifier Hum when running on the UPS Battery was SUBSTANTIALLY louder on the battery backup then on line power – This told me that something in the organ power supply or amplifier did note like the Simulated Sine Wave Output of the UPS Backup –
Lowrey organ serial numbers series#
The First thing that I will point out is that all of this research was done on either my Rhapsody SU400 or my current Stardust SU530 –Īs any owner of an SU series organ can tell you, they all have a very slight Amplifier Hum, some very quiet, some more noticeable –īecause both of my organs were located in my slate floored entrance hall, it was more noticeable at my home then at the dealer, which was a HUGE open carpeted space… I started with a Cyber Power with “Simulated” sine wave output – Department where I work suggested a UPS Battery Backup over a standard surge suppressor, as they provided cleaner, more stable power – I have done a lot of research on the type of UPS Battery Backup that was the safest to use with our Lowrey Organs – This all started back when I purchased my Rhapsody SU400 – The I.T. I decided to share this based on the fact this has been a recent subject of interest…