Gang, is there a rule of thumb I can go by to select resistor types for tube amps?
Decades ago, it seemed there was carbon and wirewound, 20% tolerance was standard, and 5% was usually considered overkill.
Now I find myself buying 1% (cause they're cheap) and going with the so-called "metal film" for virtually all 1/2 watt resistors no matter where in the amp they are called for. And "metal oxide" for 2 watt resistors.
I see Gregg the Geek has started selling ST70 boards with kits and he supplies metal oxide and carbon film types (I assume optimized for their particular location).
1. How does one decide where a metal oxide or carbon film or carbon composition or metal film resistor goes??
2. How do metal oxide and metal film differ?
3. How do carbon film and carbon composition differ?
Thanks for the input!