Hello, my Engl preamp tubes wasn't glowing and there was no voltage on the pins, so I replaced the 4 diodes (1n4007) rectifier and now its working. BUT the voltage is 7.2v instead of 6.3, is that fine? Should I leave it alone? Or should I add a resistor to drop the voltage?
Also I should mention, the preamp is for 230v power outlet, in my country last time I checked it's around 246v from the outlet.
If I should add a resistor, what value and wattage should it be?
There are no power tubes, only 2 12ax7 tubes wired pin 4-5 connected together and going to ground and pin 9 is connected to the filter cap, so pin 4 & 5 are the negative and pin 9 is the positive
Since it's a pcb board preamp, the only wat that I could add a resistor is to lift the 2 legs of the rectifier (positive side ) and solder a resistor to it and solder the other side of the resistor to the board. Is that correct? The heater circuit is transformer to rectifier to filter cap to pin 9
I'm not a tech or an electrician, but I can solder and the filter caps auto discharge when the unit is off, but I always test them to make sure.
Any help would be appreciated, and I apologize for my bad English, it's not my first language.
Thanks
P.S
The 4 diodes I took out test functioning out of circuit, that's weird huh?
Also I should mention, the preamp is for 230v power outlet, in my country last time I checked it's around 246v from the outlet.
If I should add a resistor, what value and wattage should it be?
There are no power tubes, only 2 12ax7 tubes wired pin 4-5 connected together and going to ground and pin 9 is connected to the filter cap, so pin 4 & 5 are the negative and pin 9 is the positive
Since it's a pcb board preamp, the only wat that I could add a resistor is to lift the 2 legs of the rectifier (positive side ) and solder a resistor to it and solder the other side of the resistor to the board. Is that correct? The heater circuit is transformer to rectifier to filter cap to pin 9
I'm not a tech or an electrician, but I can solder and the filter caps auto discharge when the unit is off, but I always test them to make sure.
Any help would be appreciated, and I apologize for my bad English, it's not my first language.
Thanks
P.S
The 4 diodes I took out test functioning out of circuit, that's weird huh?
Comment