Good Day folks,
Got this TT C7.4T in, has a burnt power supply and upon inspection all power supply caps are ruptured.
I've done a quick disassembly and some cleaning of the PCB and removal of the PS components (FETs, FET drivers and Caps).
the 494 was dead and this replaced, temporarily soldered in a MIC4427 and some IRFP1405 to get the PS up.
At first power up, I had high current draw. Poking around a bit I removed the 4 tubes from the pre amp circuit. Powered up again and the unit powered up ok with a fair stable current draw of 2.95A. This is where I've stopped, my tube knowledge is a bit limited.
I've contacted Tru, who indicated they don't work on equipment older than 10+ years.
Looking at the amplifier section. it seems to be a straightforward FET amplifier with JFET opamp front end.
Anyone go info/schematics on these tubes amplifiers?
Got this TT C7.4T in, has a burnt power supply and upon inspection all power supply caps are ruptured.
I've done a quick disassembly and some cleaning of the PCB and removal of the PS components (FETs, FET drivers and Caps).
the 494 was dead and this replaced, temporarily soldered in a MIC4427 and some IRFP1405 to get the PS up.
At first power up, I had high current draw. Poking around a bit I removed the 4 tubes from the pre amp circuit. Powered up again and the unit powered up ok with a fair stable current draw of 2.95A. This is where I've stopped, my tube knowledge is a bit limited.
I've contacted Tru, who indicated they don't work on equipment older than 10+ years.
Looking at the amplifier section. it seems to be a straightforward FET amplifier with JFET opamp front end.
Anyone go info/schematics on these tubes amplifiers?
