hi everybody,

i’m a guitarrist and bass player from germany and i recently purchased a used older model graphic fuzz with its original power supply. everything was working fine at first but now that i had lend it to friend, it hums when switched on. the humming stays constantly even when i disconnect the input cable and it gets louder/quieter depending on distortion/eq/volume levels. it stays also when i switch the fuzz off, although there is a slight change in the sound. i tried different cables and even opened the unit to see if there is broken connection but everything seems fine
my friend said nothing bad happened to the fuzz when he had it and he didn’t recognize any hum when he was using it. however, he said he used the power supply also to power his frequency analyser (not both at the same time) which also worked fine.
i already measured the output of the power supply (…also tried different sockets, changed direction in the socket and moved it away from other supplies) and it reads +/- 34V. isn’t it supposed to be 40V?
could this cause the hum? if this is the problem, how could such a output voltage drop have occured?
any help would be much appreciated. thanks!

cheers,
starscape