It's not so much that you have to change the OT itself. The original Herzog (which is what I am referring to, not the H-Zog of later years) used a Hammond 145 series OT. The OT on a Herzog has a load resistor (6ohm 10 watt) and a 1meg pot (to adjust the output), and then into a DPDT switch (to add or remove the Herzog from the circuit).PaulS said:Could you do that by changing the OT on let say the valve Junior attenuating the signal to a lineout or headphone signal ????