So let's say I want to keep some transistors on hand

[zeno]

Metal film is fine. On a SS set there is some risk going
with higher watt resistors. In some cases like the 330 ohm
on your 9-57 ( also on 9-90 ) board need to go from 1/2
up to 1w due to a near 100% failure rate. One place you
should never go up is low value resistors. They are often
used as a fuse only. Newer sets use a lot of them.

73 Zeno

[TinCanAlley]

Originally Posted by zeno

Metal film is fine. On a SS set there is some risk going
with higher watt resistors. In some cases like the 330 ohm
on your 9-57 ( also on 9-90 ) board need to go from 1/2
up to 1w due to a near 100% failure rate. One place you
should never go up is low value resistors. They are often
used as a fuse only. Newer sets use a lot of them.

73 Zeno

I wish there were a way to know if it's a 1/4 or 1/2 just by looking. If a low value might be used as a fuse, they should note the wattage. As it is, the schematics only state that they are 1/2 or less unless noted. Well that doesn't do much to help if the resistor is meant to be no higher than a 1/4.

So is there some kind of guideline with regards to resistor value and wattage? Is there a certain value where anything at or below it is usually a 1/4 and anything above it goes to 1/2 and more as the value increases? Or is value independent of the heat it dissipates?

Must admit I'm learning lots lately. Once I get the Avanti up and fully functional, I'm taking what I've learned and giving the 19JC55Z chassis at thorough going over as well.