#1
Hej!

when I have my Delay Pedal in the Loop FX the volume automatically goes down and up while playing the amp. (volume fluctuation)

Without the Delay in the loop everything works fine.

Can anyone help me?! I cleand the patchcables etc. but its still there....

Thx heaps!
#2
The fx loop is tube buffered right?

Find a new, working tube, and substitute the buffer tube, then see if anything changes.
Name's Luca.

Quote by OliOsbourne
I don't know anything about this topic, but I just clicked on this thread because of your username :O
Quote by Cajundaddy
Clue: amplifiers amplify so don't turn it on if you need quiet.
Quote by chrismendiola
I guess spambots are now capable of reading minds.
#3
I'm pretty sure V4 is for the loop. You can try swapping tube positions and see if the problem moves elsewhere.

You can also try cleaning the tube socket for V4 by removing the tube, spraying the tube pins and reseating the tube a few times until it's nice and smooth.
Guitars:
Jackson Kelly KE3 - MIJ (Distortion/Jazz)
Jackson DKMGT Dinky (EMG 81/85)
ESP E-II Eclipse Custom (JB/'59)
ESP LTD EC-1001FR (EMG 81/60)
Fender MIM Strat

Amps:
Mesa/Boogie Dual Rectifier Roadster 212
Laney IronHeart IRT-Studio
Peavey Vypyr 30
Peavey ReValver Amp Sims
TOOOO many T.C. Electronic Pedals. . .
#4
He has a volume fluctuation with a certain pedal in the loop, no volume fluctuation without it, and you all think it's a amp/tube problem?

Unless that's the ONLY pedal in the loop, there's a vastly higher chance that the pedal's borked.
“Ignorance more frequently begets confidence than does knowledge.”
Charles Darwin
#6
Quote by Arby911
He has a volume fluctuation with a certain pedal in the loop, no volume fluctuation without it, and you all think it's a amp/tube problem?
I'm guessing the loop (so the tube driving it) is disengaged if there's no pedal plugged into it, and I found more plausible that a tube, among everything, is faulty.

Reading the OP again tho I see I may have misunderstood.
Does the amp have the same problem if something else is in the loop?

Also def try what Random3 suggested before what I suggested.
Name's Luca.

Quote by OliOsbourne
I don't know anything about this topic, but I just clicked on this thread because of your username :O
Quote by Cajundaddy
Clue: amplifiers amplify so don't turn it on if you need quiet.
Quote by chrismendiola
I guess spambots are now capable of reading minds.
#7
Quote by Random3
I am 99% sure it is impossible for a cable to cause that problem.

Therefore it's either the amp or the pedal.

Try plugging the FX loop into itself without the pedal so that the loop is active.

If it doesn't happen then the fault is the pedal.

It 100% could be a cable

Try linking the send and return with a patch cable like Random suggested. Then try swapping out the cables to and from the delay. Then try a different power supply. Finally, replace the pedal.
Epiphone Les Paul Plus Top
Jet City JCA5212RC (SLO Modded)
Ibanez WD7 Wah
Mad Professor Sweet Honey Overdrive
TC Electronic Flashback Triple Delay
TC Electronic Trinity Reverb
#9
Quote by GABarrie
It 100% could be a cable
A continuous change in volume even if the cable is still?

I kinda doubt it.
Name's Luca.

Quote by OliOsbourne
I don't know anything about this topic, but I just clicked on this thread because of your username :O
Quote by Cajundaddy
Clue: amplifiers amplify so don't turn it on if you need quiet.
Quote by chrismendiola
I guess spambots are now capable of reading minds.
#11
Quote by Spambot_2
A continuous change in volume even if the cable is still?

I kinda doubt it.

Cables are rarely still. Amps experience vibration, dodgy cables can be affected.

All I'm saying is you shouldn't just rule it out as a source of the problem.
Epiphone Les Paul Plus Top
Jet City JCA5212RC (SLO Modded)
Ibanez WD7 Wah
Mad Professor Sweet Honey Overdrive
TC Electronic Flashback Triple Delay
TC Electronic Trinity Reverb
#12
Quote by diabolical
The 6505 combo also had a design problem with the fx loop if not mistaken...


Not really a design problem per se, just a really bad buffer that I think was intended to retain brightness at lower volumes. However, it sucks all the life and the balls out of the amp and adds fizz whenever the FX loop is in use. But with a $0.75 capacitor and 10 minutes of dis-assembly and soldering the problem goes away.

Anyway, TS -- try just plugging a short patch cable into the effects loop from send to return (or a long one, it really doesn't matter). So no pedals are actually in the loop, just a cable. That will tell you whether the problem is with your amp or that pedal.
Atmospheric dark metal w/ black and death metal influences:
(My Soundcloud page):

Pestilential Flood