[Joeztech]

Yesterday the Vaco/Varco TN4 replacement cartridge and stylus assembly arrived. I finally got around to installing it this morning. This involved removing the Bozak preamp from the circuit completely. I disconnected the 150K ohm resistor under the chassis of the radio that is the load resistor for the original Philco cartridge. I temporarily tacked a 500K ohm variable resistor in circuit for the new cartridge load and started the changer. With the record playing and both channels of the cartridge bridged together with a Y cable, I adjusted the variable control for maximum volume and best tone quality. It turned out that the best total resistance was about 312K ohms. I used a 270K ohm and a 47K ohm resistor in series to provide the load for the new Vaco cartridge. There is lower residual 60Hz hum with the ceramic cartridge and the volume level is higher with no audible distortion. The tone response is adequate throughout the tone control adjustment range.

I can now close the unit up and concentrate on cleaning up the cabinet and repairing some veneer delamination.

Joe