K7JHG
Member
Greetings AKers.
I've had this amplifier for about 8 months and have blown each of the four 10 ohm 2 watt bias resistors at the rate of about one per month - each has blown at least once. The first time my rectifier tube flashed so I installed the rectifier diode mod and got a new 5AR4 tube. The rectifier tube has been good since until the last time the rectifier tube flashed again so I suspect it may need replacement.
All my voltages (quad cap, rectifier and KT88s) check out per spec.
My question is - it was suggested by the amp builder that I replace the four 10 ohm 2 watt bias resistors with 10 ohm 5 watt resitors. I can't seem to find 5 watt resistors with less than 5% tolerance so I'm thinking I might use 3 watters with a 2% tolerance.
Does this make sense. Will the increased resistor wattage, either 3 or 5 watt, save me from blowing reistors or could it possibly exaserbate an underlying problem.
Thanks,
John
I've had this amplifier for about 8 months and have blown each of the four 10 ohm 2 watt bias resistors at the rate of about one per month - each has blown at least once. The first time my rectifier tube flashed so I installed the rectifier diode mod and got a new 5AR4 tube. The rectifier tube has been good since until the last time the rectifier tube flashed again so I suspect it may need replacement.
All my voltages (quad cap, rectifier and KT88s) check out per spec.
My question is - it was suggested by the amp builder that I replace the four 10 ohm 2 watt bias resistors with 10 ohm 5 watt resitors. I can't seem to find 5 watt resistors with less than 5% tolerance so I'm thinking I might use 3 watters with a 2% tolerance.
Does this make sense. Will the increased resistor wattage, either 3 or 5 watt, save me from blowing reistors or could it possibly exaserbate an underlying problem.
Thanks,
John