It's not required, but carbon composition resistors are very low inductance, and will behave like a resistor out to very high frequencies.
Here is some reading on the topic.
FWIW, we have gotten good results out of using physically small 220 Ohm carbon film resistors in these positions.
« Last Edit: November 28, 2013, 08:40:57 AM by Caucasian Blackplate »
Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man