Title: Which replacement power cord?
Post by: Snuggles on August 05, 2021, 06:32:00 PM
Post by: Snuggles on August 05, 2021, 06:32:00 PM
I've lost the power cord to my Marshall JCM 900 100 watt head. On the back of the amp near where I plug the power cord in, it says "120 V 50 - 60 Hz 375 watts." It's 3 pronged going out and 3 pronged going into the wall. I'm looking to buy a replacement power cord but don't know the correct specs for the power cord. Would I be OK getting a replacement cord saying its "15 amp" ? Thanks in advance for your help!
Title: Re: Which replacement power cord?
Post by: Enzo on August 05, 2021, 08:52:36 PM
Post by: Enzo on August 05, 2021, 08:52:36 PM
It is just a guitar amp. Pretty much any IEC power cord will work. Like the ones for your computer or other modern electronics.
A 15A cord can handle 15 amps at 120v , that is 1800 watts. WAAAAYYY more than enough for a 375 watt amplifier
A 15A cord can handle 15 amps at 120v , that is 1800 watts. WAAAAYYY more than enough for a 375 watt amplifier
Title: Re: Which replacement power cord?
Post by: Jazz P Bass on August 06, 2021, 12:08:21 AM
Post by: Jazz P Bass on August 06, 2021, 12:08:21 AM
Ohms Law
I=P/V
375W /120V = 3.12Amps
What you should look for is a cord that is the proper length for how you plan to use the amp.
At home a 5 or 6 ft cord will be fine.
On a stage you may want a 10 footer.
I=P/V
375W /120V = 3.12Amps
What you should look for is a cord that is the proper length for how you plan to use the amp.
At home a 5 or 6 ft cord will be fine.
On a stage you may want a 10 footer.
Title: Re: Which replacement power cord?
Post by: Snuggles on August 06, 2021, 09:32:49 AM
Post by: Snuggles on August 06, 2021, 09:32:49 AM
Thanks to you both!
Title: Re: Which replacement power cord?
Post by: 66cccfff on August 13, 2021, 11:48:43 PM
Post by: 66cccfff on August 13, 2021, 11:48:43 PM
That'll work well. Actually, any IEC power cables would work equally well for home and information products. Always use cords with a wire gauge of 0.75mm2 or greater(I dunno how much AWGs it equals to ... In my country, we use squared millimeters instead of AWGs to measure wire gauge ) to ensure an abundant supply of current and to eliminate risks of fire.
Title: Re: Which replacement power cord?
Post by: Enzo on August 14, 2021, 11:15:51 AM
Post by: Enzo on August 14, 2021, 11:15:51 AM
20ga would be fairly light, though plenty for a guitar amp. 18ga would be the very common size, and 16ga would be relatively heavy. I have no idea what size they are in metric area. Often, if not usually, the wire gauge is embossed in the vinyl jacket of the cable.
Title: Re: Which replacement power cord?
Post by: joecool85 on August 17, 2021, 07:12:17 PM
Post by: joecool85 on August 17, 2021, 07:12:17 PM
Quote from: 66cccfff on August 13, 2021, 11:48:43 PM
That'll work well. Actually, any IEC power cables would work equally well for home and information products. Always use cords with a wire gauge of 0.75mm2 or greater(I dunno how much AWGs it equals to ... In my country, we use squared millimeters instead of AWGs to measure wire gauge ) to ensure an abundant supply of current and to eliminate risks of fire.
0.75mm2 is 18 gauge. I wouldn't use anything smaller than this either. At the length most power cables are (3-6' or 1-2M), they can push 15 amps very safely which gives 1,800w at 120v - way more than most of us would ever need!
Title: Re: Which replacement power cord?
Post by: 66cccfff on August 18, 2021, 07:09:30 PM
Post by: 66cccfff on August 18, 2021, 07:09:30 PM
Quote from: Jazz P Bass on August 06, 2021, 12:08:21 AM
Ohms Law
I=P/V
375W /120V = 3.12Amps
What you should look for is a cord that is the proper length for how you plan to use the amp.
At home a 5 or 6 ft cord will be fine.
On a stage you may want a 10 footer.
Also, it's a good choice to get a short power cable and a longer IEC13-to-IEC14 extension cable.
Then you can make sure that the power cable is able to be short enough to eliminate mess in domestic condition and long enough to reach the outlet on the stage.