Modulus Supa Deluxe Kit Build Part 4
Рет қаралды 132
7 ай бұрынBuild thoughts after final wiring with replacement parts received, plus voltages and output valves bias checked.
Please be aware of the potentially lethal voltages present in valve amplifiers before you decide to delve into one.
paul-williams7456.weebly.com/
@RAfiote2 7 ай бұрын
Hi, I dont understand the issue with the two 100r. It should only reference the virtual CT for the heaters to a positive voltage. You had different bias voltage on pin 8 of the power tubes with them?
@paulwilliams4984 7 ай бұрын
With the 2 x 100r resistors in place the cathode resistor measures only 42 ohms, giving a significant increase in the bias current.
@paulwilliams4984 7 ай бұрын
Looking back over the results with the 2 x 100r resistors in place, I got the following measurements; Voltage drop across cathode resistor = 7.2 volts, so divided by the 42 ohms of the measured resistor is 0.1714mA which is halved as it's serving two valves, so 0.086mA. The average cathode to plate voltage here was 243v, so multiplied together gives 20.8watts at idle, well over the 14 watt max for a 6V6GT (150% ish).
Paul Williams
Рет қаралды 151