Channel 2 & 3 phantom power buttons do not stay engaged. The phantom power works fine on all channels it is simply whatever mechanism that holds the button does not grab. The problem is with these two buttons engaging & not the actual phantom power signal.
I did GAF tape buttons 2 & 3 down once for a session which worked fine and did keep the phantom power engaged. Channel 1 & 4 phantom power buttons stay engaged without any problems.
The preamp is in otherwise perfect condition. All other buttons & functions work properly and sound great. The unit is priced lower than the average street value to account for this imperfection. The item "API 3124 preamp (4 x 312 api preamps)" is in sale since Thursday, June 22, 2017. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Preamps & Channel Strips".
The seller is "joelnanos" and is located in Kansas City, Missouri. This item can be shipped to United States.