I've currently this map, but it's not really sure :

v1
V1a = First gain stage, feeds gain controls all channels
V1b = From gain controls all channels

v2
(a and b) gain, lead channel

v3
(a)bass treb mids
(b)post gains

v4
(a)Loop send
(b)Loop return

v5
(a)Phase Inverter

It's a copy paste of viewtopic.php?p=190549#p190549 and this is for the 6505+, the first displayed link in google...

The 6505 is a different beast and there is 5 tubes, not 4 on the 6505 too.

@surfnorthwest : thanks but i've the 6505 head, not the 6505 plus ;)

Hi,

i've a 6505 head. Just wanna know for each valve, the role they have (gain recovery after tone stack, gain input). I know obviously the P.I., the buffed output roles and position, but the chained input valve is not explain anywhere.

Regards,
Da.