KATANA - is the power transformer multi wall voltage (120/240)?

Started by Aaron, January 09, 2019, 08:41:01 AM

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Aaron

Hi!
I kept the title short, so I'm sure it's not clear what I'm asking.

Basically, it seems that the Katana's come with a check mark on the decal next to the power cord connection that says "this amp is for 120V" or "for 220V"

I want the Katana to be international!  That is, is the voltage marked on the box the ONLY voltage you can use?

Or is it possible to rig up a switch and attach it to the back of the amp that would allow you to choose the wall voltage?

Yes, I am aware that you can buy an external transformer ::)

I guess while I'm at it, what voltage does the standard Katana wall to circuit board transformer supply to the circuit boards inside the amp?

thanks a lot!

HAMERMAN409

I don't own a Katana and have not had the opportunity to open one up but from the pictures I have seen it looks like the transformer is market specific. I would be glad to find out I am wrong.

admin

Different version Katana's ship to each region

to convert a 120VAC Katana to 240VAC - need to swap the internal power transformer 

Internal view is here
https://www.vguitarforums.com/smf/index.php?topic=19475.0

Aaron

Quote from: admin on January 09, 2019, 12:03:46 PM
Different version Katana's ship to each region

to convert a 120VAC Katana to 240VAC - need to swap the internal power transformer 

Internal view is here
https://www.vguitarforums.com/smf/index.php?topic=19475.0

thanks for the answer (even though its not what I wanted to hear!)

I saw the pic before but couldn't tell what was going on.

Do you know the output voltages from the wall transformer, so if I decide to order one, I could?

thnaks!


Aaron

Quote from: admin on January 13, 2019, 09:39:54 AM
Where do you live?

https://en.m.wikipedia.org/wiki/Mains_electricity_by_country

I've got 230VAC coming out of the wall.

My question is what voltages does the transformer supply to the circuit boards of the Katana

alancarl

Quote from: Aaron on January 14, 2019, 07:20:33 AM
I've got 230VAC coming out of the wall.

My question is what voltages does the transformer supply to the circuit boards of the Katana

I hope it's ok to chime in here with a Katana power supply question....
Is the power supply for the Katana a Linear power supply or a BASH type class AB amp/switching modulated power supply?
A set of schematics would be very helpful...but that will not happen any time soon:-)
Thanks,
AL

gumtown

Free "GR-55 FloorBoard" editor software from https://sourceforge.net/projects/grfloorboard/

admin

Different version Katana's ship to each region

to convert a 120VAC Katana to 240VAC - need to swap the internal power transformer 

Internal view is here
https://www.vguitarforums.com/smf/index.php?topic=19475.0


Aaron

OK, I'm thrilled!
I watched the 60 cycle hum guy's first attempted repair video (Ryan?) and you can clearly see the linear transformer there!
YEA!!

So does anybody know what voltage the transformer is supplying the rest of the amp i.e., 220VAC>>>"X" VAC???

Aaron

I'm posting this for anybody else who might want to know.

It's a linear isolation transformer, and doesn't have leads for different wall voltages.

I measured with a DVM with one lead on the Neutral wire, and the other lead on the molex plug wires)

the output voltages are (Molex plug,from position 1-5)
1. Red wire 7 VAC
2. Orange wire 11.6 VAC
3. Black wire 16.5 VAC
4.  Orange wire 21.5 VAC
5. Red wire 25.7 VAC

I'll post a lot of gut pics and more info tomorrow, I'm too tired now

philjynx

Quote from: Aaron on January 14, 2019, 07:20:33 AM
I've got 230VAC coming out of the wall.

My question is what voltages does the transformer supply to the circuit boards of the Katana
Bump.
I'd like to know what the OUTPUT voltage of the Katana power supply is too.


Edit:
Didn't notice the info that's been posted. So it seems it's horrible complicated and gets turned into DC somewhere else.
So much for my 'wouldn't it be great to make battery power an option'. And no, I don't want to use an inverter. Sad face.