Cqwet Dbdfte
Well-known member
- Joined
- Oct 2, 2023
- Messages
- 613
More voltage in the power supply affords a higher idle voltage, with correct grid bias.
But your coupling caps may have to be upgraded, and plate resistor has to be checked for max volts, two in series may be in order.
I have a bag of 10W 100k w.w. resistors that I have used for very low nose applications , replacing metal film resistors that became noisy, in a $10,000 power amp.
Some tubes are better spec'd for higher voltage, like the 6SN7 and similar.
However, if you want max voltage swing without very high +B, I would suggest using a constant current source like a pair of DN2540's, and should be set to a linear current level on the grid/plate chart.
This will extract the highest linearity of a tube. Great for driving low mu power tubes.
But your coupling caps may have to be upgraded, and plate resistor has to be checked for max volts, two in series may be in order.
I have a bag of 10W 100k w.w. resistors that I have used for very low nose applications , replacing metal film resistors that became noisy, in a $10,000 power amp.
Some tubes are better spec'd for higher voltage, like the 6SN7 and similar.
However, if you want max voltage swing without very high +B, I would suggest using a constant current source like a pair of DN2540's, and should be set to a linear current level on the grid/plate chart.
This will extract the highest linearity of a tube. Great for driving low mu power tubes.