converting 220v to 110v, what colors to run in parallel?

[sonnet79]

Hi Guys,

I own a Trace Elliot AH300SMC bass head that i recently shipped from the UK to the USA.

I need to rewire the primary and double the fuse for the transformerto move from 220V to 110V, though I'm unclear as to what color to use. At present they're running in series. Which colors run to the existing cables for the parellel? It uses a 73-TRAN-300-MOS-TX and I know how to do this, I just don't know what colors!!!

Any help you could offer would be greatfully apreciated!!

Sonnet79

[Enzo]

We'd have to see at least photos, or some documentation. I have no idea what colors you have to start with.

[sonnet79]

I'm sorry, my inane first post wasn't particularly clear!!

I have the schematics for the amp, but there was no mention of the transformer. I'm not in the posession of the amp at present. I'll see if I can't get a photo tomorrow.

Apologies again for the rather rambling first post!!

[Enzo]

A link to the schematic wouldn;t hurt too.

[sonnet79]

GP7 300 watt 7 band series.pdf

This is the best I have. Thanks for taking an interest in this Enzo. I'll see if I can't upload a couple of pictures over the next few hours.

[Enzo]

You are right, the schematic is no help.

We may be able to determine something from photos, or perhaps someone who has one can look inside. I would suggest contacting Trace and asking if they can provide transformer wiring.

[R.G.]

Colors of wires are interesting and useful sometimes, but when dealing with AC power wires

NEVER_NEVER_NEVER_NEVER_NEVER_NEVER_NEVER_NEVER_NEVER_NE VER_NEVER_NEVER_NEVER

trust wire color alone. Use your meter and identify the stuff you have on hand. Someone may have hooked up the wrong color wires before you got it.

At least, test it yourself if you want to continue to live and play guitar. 8-)

[sonnet79]

Thansk for all the advice so far. I actually handed it to my guitarist who has his own repair shop.

Out of my own curiosity, i made a very crude diagram of how the primary is wired right now. I know that the wiring is working just fine for 230V as i am the original owner of the amp, and it's not been doing anything for the past three years other than sitting in a closet in my parents house back in the UK:



The purple and brown are grouped together, as are the grey and blue. Now I know it should be wired either like this for 110V:



Or like this:



The cables are grouped with around an inch of black flex from the transformer. Purple and Brown from one, and Grey and Blue from the other.

All of this is purely academic, as my buddy will have it taken care of in the next few hours, I'm just curious! I know I also need to double the amp rating in the fuse.

Thansk again guys!

[bob p]

this might be an option until you get the definitive answer from tech support:

Hammond Mfg. - "AUTO" Plug In - Line Transformers (Step Up) - (176 Series)