05-01-2018, 12:23 PM
You know, over time the idle current is probably going to drop as the tubes age (assuming bias on a "new" tube is set properly from the beginning). In this aging process the sound usually doesn't degrade much until the end. I have installed old/used tubes that conduct considerably less and they sound fine.
As I recall, I set my Scott up so the idle current was about 10% below spec. I'm happy with it.
Oh, did I mention the fan
Heat causing vaporization and condensation of conductive material on the micas/insulators is a common cause of redplating, tube and transformer failure.
The little 10 ohm cathode resistors are a good way to protect and calibrate the output.
As I recall, I set my Scott up so the idle current was about 10% below spec. I'm happy with it.
Oh, did I mention the fan
Heat causing vaporization and condensation of conductive material on the micas/insulators is a common cause of redplating, tube and transformer failure.
The little 10 ohm cathode resistors are a good way to protect and calibrate the output.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
