07-12-2016, 11:59 AM
Wirewound go up.
Many carbon types go down, unless damp, in which case they go up, then go down next time when dried.
Old composition types of high value, tend to go high or open circuit with age rather than heat (low gain due to bad G2 volts, accentuated by leaky caps). Less than 2K tend to go low (unfortunate for cathode resistors or HT decoupling).
Composition types can be poor. Carbon Film, Metal Film and Metal Oxide are fine.
Many carbon types go down, unless damp, in which case they go up, then go down next time when dried.
Old composition types of high value, tend to go high or open circuit with age rather than heat (low gain due to bad G2 volts, accentuated by leaky caps). Less than 2K tend to go low (unfortunate for cathode resistors or HT decoupling).
Composition types can be poor. Carbon Film, Metal Film and Metal Oxide are fine.
