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I liberated the amplifiers from a Saville solid state organ, which consists of 5 groups of 6, 20w amplifiers for a total of 30, 20w amplifiers. The power supply is seperate and voltage for the amps is 47v dc.
For testing I have one stereo amp pair connected up with the PSU and speakers. When the power is turned on, a loud fixed pitch sound is heard, which collapses over 3-4 seconds, then every thing quiet, and works well. I tried turning on the PSU first then the amps, but same result.
The PSU is typical old style metal chassis with transformer on top, full wave bridge.
The amps are open with a plate heat sink covering most of the PCB, no overall metal case or enclosure. Connection from PSU to AMP is two wire +/-, 47vdc.
The settup mimics the original setup when in the organ.
Any suggestions on how to prevent the initial noise?
Tuneturkey
I liberated the amplifiers from a Saville solid state organ, which consists of 5 groups of 6, 20w amplifiers for a total of 30, 20w amplifiers. The power supply is seperate and voltage for the amps is 47v dc.
For testing I have one stereo amp pair connected up with the PSU and speakers. When the power is turned on, a loud fixed pitch sound is heard, which collapses over 3-4 seconds, then every thing quiet, and works well. I tried turning on the PSU first then the amps, but same result.
The PSU is typical old style metal chassis with transformer on top, full wave bridge.
The amps are open with a plate heat sink covering most of the PCB, no overall metal case or enclosure. Connection from PSU to AMP is two wire +/-, 47vdc.
The settup mimics the original setup when in the organ.
Any suggestions on how to prevent the initial noise?
Tuneturkey