Voltage selection switch

[amplifiednation]

I'm looking to add a five position rotary selection switch to an amp to allow for 100/120/220/230/240v

Any ideas?

I'm thinking about this...but I don't understand the "off" position

http://www.grainger.com/product/CARLING ... itch-4X739

[Jana]

Off is Off. There are 4 poles and one common. You can select None--1--2--3--4.
This won't do what you want. You need a single pole, 5 throw switch.

This one would do it: http://www.grainger.com/product/NKK-Rot ... =P2IDP2PCP

[amplifiednation]

Thanks Jana! Man that is pricey but it would in fact work!!

[tele_player]

The few universal transformers I've seen can't select all voltages using a single-pole switch.

Robert

[rp]

The few universal transformers I've seen can't select all voltages using a single-pole switch.

I replaced all my PTs when I moved to Italy, I have only have two that allow a single pole switch, both custom winds done (without my specifying either way) with parallel taps rather than the Hammond 300 way with the taps in series (if I got it right). Both are huge, I guess that's why it's usually not done that way.

Anyway, I would be leery of using a switch like that on the back of the amp, (very) fearful that it would get accidentally moved to 120V in 240V-land. If the client world-hops a lot I would try and put it on the top so you'd have to take the back panel off to switch it, or if the person travels once in a blue moon I would do it like this, which is how I did it for myself with the Hammond 300s.

[Structo]

Nice looking amp.

What is the ground bus wire you used?

[rp]

What is the ground bus wire you used?

https://www.tubesandmore.com/products/S-W140

I'd prefer it be round actually, but I've been using it for like 20 years so I'm used to it. I could use some heavy gauge wire stripped out of romex or something, but this is nice soft copper and pre-tinned.

[JMFahey]

You are trying to do this, which was standard on export Silverface amps .... quite dangerous if you ask me:

[img:640:521]http://cdn.tonegeek.com/wp-content/uplo ... 40x521.png[/img]

Modern amps use a 2x115V primary transformer, which can be set in series/parallel for 230/115V using this safe switch(flush with chassis, strong spring, requires the tip of a small screwdriver to operate)

[img:400:300]http://www.wellgainelectronics.com/Prod ... 125VAC.JPG[/img]

For a special multitapped transformer (not much used today because it's heavy and expensive) they still make rotary switches, but meant to be turned with a coin, not with bare hands (or rubbing against something):

[img:600:480]http://www.schurter.com/var/schurter/st ... _large.jpg[/img]

[Phil_S]

You can always look for one of these, reasonably priced:
http://www.ebay.com/itm/10pcs-1-Pole-5- ... 3a98e7ba21

Search for 1P5T or 1P6T switch.