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DIY Stompboxes => Building your own stompbox => Topic started by: Josemitejam on June 18, 2022, 04:51:40 PM

Title: Plug for an amp question
Post by: Josemitejam on June 18, 2022, 04:51:40 PM
Hi all!

Quick question: I have this Randall amp that I bought years ago. I'm missing the power plug for it. Can I buy any 3 prong plug that fits it or do I need to specify further than that? Any links would be greatly beneficial.

Thanks!


Joe
(https://i.postimg.cc/SJJ13Xgf/9-D20-F220-A4-EC-492-C-8459-DB9-C003273-F8.jpg) (https://postimg.cc/SJJ13Xgf)
Title: Re: Plug for an amp question
Post by: stallik on June 18, 2022, 05:10:05 PM
That's an IEC socket (with fuse fitted) so a any IEC plug should fit. My preference with amps is really long cables to save using extension cables but they tend to disappear at the first gig.

Amazon have them
Title: Re: Plug for an amp question
Post by: antonis on June 18, 2022, 05:10:37 PM
Any IEC 3-wire prog should be OK.. :icon_wink:
Title: Re: Plug for an amp question
Post by: Josemitejam on June 18, 2022, 09:01:51 PM
Perfect! Thanks a ton!  ;D

Joe
Title: Re: Plug for an amp question
Post by: Rob Strand on June 18, 2022, 09:12:17 PM
Nothing to do with amplifiers:  FYI, there's actually two types of IEC plugs and sockets.   Not so common now, but hot appliances like kettles used "high temperature" IEC sockets.   The kettle has a key which blocks the insertion of the common IEC power cables.

High temp:
https://www.wiretek.com.au/ac-power-leads-iec/iec-c15-keyway-to-mains-plug-high-temp/9910/fl/
(https://www.wiretek.com.au/prodimages/section12_images_1024/acl140_diag.jpg)

Common:
(https://static.inkstation.com.au/pi/52965a/0/power_cable_3pin_21.jpg)
Title: Re: Plug for an amp question
Post by: PRR on June 19, 2022, 01:11:09 AM
Quote from: Josemitejam on June 18, 2022, 04:51:40 PM...Can I buy any 3 prong plug that fits it....

BUY??!

It is the same as almost any desktop PC or monitor. Your PC-hacking friend will give you several.

FWIW, a 1979 Olympia typewriter has the same cord.
Title: Re: Plug for an amp question
Post by: anotherjim on June 19, 2022, 04:31:38 AM
The only concern is any fuse fitted in the wall plug. Depending on your region's electrical rules. Here in the UK with 240v power, the electronic appliance IEC will have a 5A or 3A fuse. A high-power appliance such as a kettle will have a 13A fused plug and an annoyingly short length. However, there's nothing to stop anyone from replacing a 3A fuse with 13A.

Maybe the only reason the wall plug is fused is that the 220-240v supply is lethal and the cable might get ripped or crushed.

The IEC is a great improvement on the old round Bakelite Bulgin 3 pin Marshall and others used in the 1960s.

Title: Re: Plug for an amp question
Post by: Rob Strand on June 19, 2022, 04:45:12 AM
QuoteThe IEC is a great improvement on the old round Bakelite Bulgin 3 pin Marshall and others used in the 1960s.
There was also the Cannon /XLR power mains connectors:

https://www.ebay.co.uk/itm/Cannon-XLR-Type-CEA-AXR-LNE-12-3-Way-250Vac-6A-Cable-Connector-MBH007F/391735762192

Never fond of them I had a feeling one day someone would manage to plug mains into an audio device.
Title: Re: Plug for an amp question
Post by: DIY Bass on June 19, 2022, 07:07:09 AM
It has been a while, but I have used gear with the 240v Cannon connectors.  Powered front of house speaker bins from memory.  My memory of the way they are arranged is that there is no way the jack would go into a standard XLR socket, and no way power would transfer unless it was properly inserted.
Title: Re: Plug for an amp question
Post by: anotherjim on June 19, 2022, 10:56:41 AM
Well, the BBC used those Cannon AC plugs so they must have been perfect!
Title: Re: Plug for an amp question
Post by: davent on June 19, 2022, 11:36:20 AM
Quote from: stallik on June 18, 2022, 05:10:05 PM
That's an IEC socket (with fuse fitted) so a any IEC plug should fit. My preference with amps is really long cables to save using extension cables but they tend to disappear at the first gig.

Amazon have them

I use a long heavy duty outdoor rated cable that i replaced the standard female connector with a Schurter IEC female.
Title: Re: Plug for an amp question
Post by: PRR on June 19, 2022, 01:51:08 PM
Quote from: anotherjim on June 19, 2022, 04:31:38 AM...in the UK .....Maybe the only reason the wall plug is fused is that the 220-240v supply is lethal and the cable might get ripped or crushed.

It's because the UK runs 30/32 Amp ring mains direct to outlets. An appliance cord that could pop a 30A fuse/breaker without setting the carpet on fire is THICK and EXPENSIVE. (I know, I have several, for extreme loads and sources.) OTOH if you can ensure a 3 Amp fuse IN the plug, you can use those IMHO insanely thin cords I see English professors bring from home. They really are fine, as long as nobody uses a larger fuse.

FWIW, the photo shows a 120V amplifier.
Title: Re: Plug for an amp question
Post by: antonis on June 19, 2022, 03:46:08 PM
Quote from: PRR on June 19, 2022, 01:51:08 PM
those IMHO insanely thin cords

3 X 0.5mm2 - 5A current rating.. :icon_cool: