Tube Amp Archive

Without seeing the amp it's just a guess, but the red wires are probably the center taps of the output transformers. So the DMMs positive lead (red) goes to the PCB and the negative lead (black) goes to the wire. If you connect it backwards the only thing that will happen is the current will read n...

Okay, you've been warned. You need two meters. Otherwise changing the bias setting on each pair of tubes will load down the power supply and change the operating conditions of the other pair of tubes. Unplug the amplifier and put the standby switch in the play position to drain energy stored in the...

It won't hurt you read Lord Valve's take on bias, but the most important thing to read is right from the Carvin manual: "Biasing should be left to a qualified technician due to the fact that lethal voltages near 500 volts are present inside the amplifier." Actually, the current will kill you long b...

I was not sure if this is the right place to ask questions like this, but this is the only site I could seem to find that might help me. My Carvin TS100 previously had Tungsol 6l6 tubes biased by a friend, but I want to change out those tubes and put in the original groove tube el34's I had with it ...