New JCM 800 2203 with low humming sound


Just received my new JCM 800 2203 head with a new vintage 1960 av cabinet. Hooked it up and turned the power on standby. Very noticeable humming sound coming from inside the head. Is this normal? I have a early 90's JCM 900 that never has made any sounds on standby or powered up fully. Can I get some advice before I decide to send it back and go with something else?

thanks much!





asked 14 Dec 2019 at 02:55 PM

Rory Lasee
Answers: 1


Hello Rory,


It is perfectly normal to hear a slight hum coming from the amplifier.


Kind Regards

Marshall Support

answered 16 Dec 2019 at 12:02 PM

I have a 1990’s JCM 900 and it is dead silent on standby and powered up. Why would my new one produce a very noticeable hum even when on standby? Is it cheap circuitry?
- Rory Lasee 17 Dec 2019 at 11:17 AM
If you feel that the hum is too loud then we would recommend that you take it back to the dealer so they can check it over for you. - Lee Tomlin 18 Dec 2019 at 08:29 AM
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