2266 Hum on power

[Doomas]

Thanks for the warm welcomes! I haven't used any pedals with the amp, just my Dean V79 which has relatively hot humbuckers on it so it's not single coil type noise I'm getting. I use a Fender Gold cable to plug it in. I haven't been able to check if it has the spacer because I keep the amp at our band's rehearsal place and it's been a while since we've had the time to play. We rehearse at our drummer's home in a small old cottage and so I've been thinking if the AC power sockets are not grounded well or something . The next time I'm there I'll take a look if I can find the spacer. Thanks for all your trouble! I am truly grateful for the support.

[Paulator]

I have the same problem with my 2266 (buzzing noise on power only), but there's another problem. I have bought the amp used from a guy who bought it in the UK, so the German Marshall distributor will most likely not provide warranty.
Is there an easy way to get this aluminium spacer? I think I am able to install it myself...

All input is highly appreciated

Thanks,

Dirk

[burnsy]

My 2266 is a 2007 model and I can see no spacer between the transformer and the chassis. Can anyone tell me how to get one and how to fix it? I assume this revision is now standard on current production.

[SteveD]

If your's isn't buzzing you don't need one.

[burnsy]

Hi Steve,

Thank you for your reply.
No I've never noticed any buzzing before, but then again I've never listened for a buzz till I read this post. I got the impression that the spacer was now fitted as standard on all units and that maybe it should be retro-fitted to the few early amps that didn't have it. If you say I don't need one then that's good enough for me. Fantastic though this forum is, maybe reading about other peoples experiences makes us look for similar problems that aren't there - Isn't paranoia a wonderful thing.
As a new boy that's now got your attention let me say that I've been waiting all my playing life for an amp that does what my Vintage Modern does - a fantastic piece of kit - thank you very much !

[AndyK]

Hey -

My 2007 VM does this buzz when turned on thing. My DSL50 also did the same thing, I though it was odd, but never addressed it. Strange thing is, when I checked my bias last night on the VM, it was a little high, so I dropped it down to 38mv, and the buzzing got a little quieter. I guess the hotter the tubes run, the more the tranny vibrates??

I'd love a magic spacer Steve!

Thanks.

[Spotted Dog]

Welcome (urlym@ple, nice freakin' collection

Welcome Doomas, some huge ABB fans around here, including me!

[SteveD]

Hey -

My 2007 VM does this buzz when turned on thing. My DSL50 also did the same thing, I though it was odd, but never addressed it. Strange thing is, when I checked my bias last night on the VM, it was a little high, so I dropped it down to 38mv, and the buzzing got a little quieter. I guess the hotter the tubes run, the more the tranny vibrates??

I'd love a magic spacer Steve!

Thanks.

The buzz that the spacer gets rid of is a constant aggressive type caused by the laminations resonating with the chassis and is not affected by the bias setting.

You can alter this buzz's tone by simply pressing your finger on the chassis near the power transformer which will change the frequency, attenuate or even eradicate it.

[Curly_Fuzz]

Hey guys,

unfortunately i think i may have the same problem (you're probably sick of hearing it by now :P)
when i switch my amp on, there seems to be a period of time where the is not buzzing, but it eventually gets louder and louder to the point where its very noticeable and irritating. I usually try to wait it out, because sometimes it does just seem to disappear. i originally thought that it may be an issue with my lead, because if i applied some pressure on the input jack the buzzing would seem to go, but the problem was still there even after replacing the cable.
i've read all the previous posts, but know absolutely nothing abouts how amplifiers work or how they are constructed, so therefore didnt understand much of what was said :S
I'm considering taking it to the shop where i bought it from and having it looked at, but at this stage, i'm not even sure what i would say :P

any advice would be much appreciated :) I'll try upload a recording of the problem (ignore the telephone ringing towards the end :P haha)

cheers

[SteveD]

Welcome to the forum Curly_Fuzz.

PM me and I'll tell you what you need to do.

[vm27]

Good day Guys! Just joined the forum today.


I recently got a VM2266 dated 2007. I just noticed last night that the amp has a very subtle hum but noticeable in a quiet room. It is coming from the head itself and the sound isn't audible in speakers. The sound can be heard even with nothing plugged in front and on standby mode. The hum increases a bit if i put it out of standby mode. Im just wondering what could be the issue of this or is this normal? This is my first real Marshall head as i had two JCM Combos before and i can't remember if those had hums too. I read some stuffs online and i stumble to this thread which is probably the same thing happening to my amp.

[cippol]

I have the same buzzing problem here mentioned. 2266C

[Meikel]

Hello,

this is my first post here. I write in from Germany, i hope my English is understandable (Babelfish Translator).

I have a Marshall 2266VM bought used. Unfortunately, now it's clear why it is so cheap in price... The amp has a problem that I will describe here:

On him just a cabinet is connected with a 12"-Speaker. Nothing else will be connected, no guitar. LDR is selected, no Mid boost. Power and Standby is ON, that is the amplifier operating in the idle state.

And he brings depending on the position of the Master Volume (MV) interference in the speaker that sounds like a single coil, which intersperses a neon lamp. A kind of audible hum or chatter. If the MV to zero, then all is ok. If you turn it on, so does this interference, which reaches its maximum just at position 2 clock. From position 3 clock this "rattle" disappears and the Amp has normal noise. One can adjust even more pointed with the Presence control in tone, but it interferes in quieter surroundings really audible.

I have removed or replaced on a trial basis all Preamp Tubes -> negative. Also with removed PI Tube is this buzzing here and with the MV as described, influenced.

I have removed the preamp board and all connections to the MV checks, including that of the cable on the connectors to the neighboring board -> all ok. I have the Electrolytic Capacitors bridged with new -> negative. I have the DC heating bridged with a new Elelctrolytic Capacitor -> negative.

I have used as a test instead of the two Marshall KT66 two 6L6 -> negative.

I have checked the operating voltages with my scope - they do not look very different from those of other amps. IMHO ok.

BIAS: 40mA for each KT66. Plate Voltages are +420 Volts, On the Screens +419 Volts.

I have no idea what could be the cause of the hum or rattle. Wanted is a Marshall expert who knows this error and can give purposeful advice.

THX and with best regards
Michael

Edit:

This Marshall is easy to service. So i can "isolate" the Power Stage by pulling all corresponding connections on the amplifier so that her only applied the voltages for the grids, anodes and heaters (and the +5Volts for digital section). Taking in particular the connection to the MV, so the hum is permanently audible. I suspect, therefore, that which comes from the power supply or from the power amplifier or from the OT.

[sikter]

Have you tried to plug your anp into another power supply?
Is your power supply grounded?

[Meikel]

Hi,

Yes, the power supply is properly grounded. The amp has on each power socket this problem.

With best regards
Michael