Not the RIGHT Vol. 112 RP 100 EVM

I recently picked up this 112 RP 100.I'm living in Switzerland,where Ac is 230 volts.
This is the (late/70ties) EL34 ElectroHarmonix (?)
Style, but....I noticed that it doesn't have the volume that 100 watts should have and also seems to cut high frequencies.
If anybody has any hints as to what I might check,
I would appreciate it.
Thanks in Advance
Marino
PS:- I bought it in Switzerland and every thing is working fine except Rev & Phasor!