problem with pedal on amp

[Progbusters]

My little combo tube amp works fine it seems to me. Its a Randall 5 watt Diavlo.

But when I put a pedal in front or in the effects loop there is a whistling feedback type of sound, especially for overdrives and distortion pedals. It kinda goes away if I use a pedal powered by a battery. This doesn't happen with my other amps. What can be cause? Tube in amp?

 

[ehdwuld]

Re: problem with pedal on amp

Which pedal are you using?
Not a whistler is it

Possibly a ground thingy

*(Sent from my durned phone!)*

 

[Progbusters]

Re: problem with pedal on amp

Someone at tgp said it might be power supply. I suppose I might have dropped my voodoo lab ISO 5 too much.

 

[ehdwuld]

Re: problem with pedal on amp

Wait it's a multi efx unit?

Not single pedals ?

OMG

I know this one fellow who blamed the howl on his "high gain" amp ( Crate Blue Voodoo or some such)
While he was on break I bypassed his Zoom pedal and jacked straight into the head

Noise disappeared

*(Sent from my durned phone!)*

 

[zzmoore]

Re: problem with pedal on amp

"It kinda goes away if I use a pedal powered by a battery. This doesn't happen with my other amps. What can be cause? Tube in amp."

Your words above...does not seem like much of an arguement for a PS problem.
I do not have an answer for you...however, tubes are in sockets for a reason.

 

[Progbusters]

Re: problem with pedal on amp

I said overdrive and distortion pedals. I'll add my boost and fuzz pedals too.

Homebrew full metal jacket
Homebrew doomsday device
Ibanez ts808
Trex luxury drive
Boss ds1
All my devi ever fuzz pedals
So basically all that add gain

And sometimes bad tubes makes funny sounds so I suggested perhaps it's "a (bad) tube in amp." Comprende?

 

[ehdwuld]

Re: problem with pedal on amp

so when these pedals are in circuit it whistles

more so when on DC power supply than on batteries?

is this correct?

 

[skyydogg01]

Re: problem with pedal on amp

turn your wall-wart around in the socket (unplug from wall, turn 180 degrees, plug back in). There may be a grounding issue. Flipping the supply switches which side is hot and neutral in the supply and may fix the problem.

if not, you probably need a new supply.

 

[Boogie Bill]

Re: problem with pedal on amp

Keep your distortion/OD/Fuzz pedals out the EFX loop. They belong in FRONT of the amp.

Bill