cathode and plate resistors

[jestaudio]

i,m re-aproaching the question from a different angle, the rule of 66 in respect to plate and cathode resistors doesn't actually seem to be much off a rule alot of layouts seem to go against it, the question being is what effect does say using a 100k/820 combo as opposed to 100k/1k5 or even 100k/2k7, i can assume it affects gain and tonal quality's but in what way
Cheers for and advice

[Phil_S]

Maybe there is something useful here?

[martin manning]

Definitely somehing useful here: http://www.valvewizard.co.uk/gainstage.html

[roberto]

Just look my thread about it.
https://tubeamparchive.com/viewtopic.php?t=17518