- Aug 5, 2022
- Reaction score
Gene Ballz has some good points depending on how you plan on doing this. “The Name is Ballzz …..Gene Ballzz lol”:
I don’t think it would cause any operational issues, but from a safety perspective, modern standards require both live feeds be fused and switched.But then your neutral is 120v away from ground, which is not the way it works in the UK and could maybe be unsafe or cause who knows what issues for equipment that is expecting neutral and ground to be at nearly the same potential.
Yes I see that a lot myselfSometimes manufacturers get cheap with the switches and just hard wire a single voltage even though the transformer is multi voltage.
FYI I was looking at schems for 50W and found the three numbers listed next to one transformer. The 410 100W has four listed while the 50W has three. It is my belief these are listed as a note for the people on the line building the amps. I say that because they are still showing 100V, 117V, 130V, and 230V input taps each with a different number. I have difficulty believing that Marshall has an actual Part for a 100V or a 130V separately. It makes more sense that it would be one part and the MFR line connects taps according to import country. I say that because, what if they over buy a particular part for 100V for instance, now they have extra inventory they have to pay taxes on and can't use on other amps. It just doesn't make business sense to me.I'm interested in the suggestions about seeing if this PT has a 120V tap- what would that look like? I'm imagining multiple tabs coming off the transformer that aren't attached to anything?
How much did they quote you? Is it a simple rewiring or is it a whole output transformer swap? Thank you!I found a local Marshall authorized service center and got a quote to change out the transformer so that's the direction I'm going to go. Thanks everyone for chiming in on this, much appreciated.
It is mandatory to switch both if you have a fixed mains cord in (in the U.K. that is).Modern standard it to switch the neutral as well, so both leads should be switched in a new amp. You could add a second fuse, but the outlet should be on a breaker that will trip if there is a short before the PT.
If it’s anything like what I paid for my amp sourced outside the country, I paid $787 (including shipping) for an amp head that sells here in the US for $1,750, and I paid about $540 (including shipping) for a cab that sells for $1,200 here. The head was $45 to ship, the cab was an extra $34 to ship due to size/weight. Also spent about $40 for a voltage transformer, got a 300 watt unit since the amp is 20 watts.Well, along with the initial international shipping, does that still leave you at a price point lower than the US retail number? If so, you've done well!
An auto transformer does not isolate Mains because it is just one coil which in this case has 115VAC input and 230VAC output. It is cheaper and lighter and therefore are manufactured. Usually it can be used both ways also feeding 230V outputting 115V.Real Genius is a classic!
Here's the latest. I called Hammond and talked with a rep who said that as long as the unit that's being stepped up is isolated, there should be no problem although when I asked him if isolation/grounding is an issue, he said "oh yeah, this is an auto transformer" which jogged something in his mind. He went on to explain things that were beyond my understanding but ended up saying that stepping down might pose an issue but stepping up should not. His only concern was the amperage rating of the Marshall (I couldn't find it during the call) because the Hammond 176C is rated for 1.3 Amps. He also said not to plug a power strip into it and run other things off it which could increase the current draw past max.
I've been playing this amp for a few days now and it sounds great and is working great.
I emailed Dagnall asking if I can get a 120v transformer from them because it sounds like this is by far the best option moving forward. Haven't heard back yet.
I'm interested in the suggestions about seeing if this PT has a 120V tap- what would that look like? I'm imagining multiple tabs coming off the transformer that aren't attached to anything?