Hi Twin
I am not stalking you!
You only need 1/2 watts, but the 1watt carbon films look right - the are the same size as the 1/2 watt carbon comps/Pihers and Iskras that Marshall used.
Only place you need 2watt rated resistors is in the B+ dropping line (Metro sells the grey metal oxide flameproofs for this as well as the larger carbon comps for the vintage vibe
