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Author Topic: Ampeg Vh140c power transformer replacement  (Read 47 times)

Ratsapprentice

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Ampeg Vh140c power transformer replacement
« on: March 30, 2020, 06:55:17 PM »
Hi guys,

I’ve had a Vh140c running through an external step down transformer for years (I’m in the UK, and the amp is a US model)and would really like to be rid of it. But I’m having a very hard time finding a suitable 230v PT.

Any help would be massively appreciated.

joecool85

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Re: Ampeg Vh140c power transformer replacement
« Reply #1 on: Today at 09:52:30 AM »
Hi guys,

I’ve had a Vh140c running through an external step down transformer for years (I’m in the UK, and the amp is a US model)and would really like to be rid of it. But I’m having a very hard time finding a suitable 230v PT.

Any help would be massively appreciated.

Any reason you want to get rid of the step down transformer?  If it is just to make it all simple and plug straight to wall, I would consider installing the step down transformer permanently in the amp rather than replacing the original transformer.  The reason being, unless you have the specs for the stock transformer, finding a replacement will be difficult.
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Ratsapprentice

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Re: Ampeg Vh140c power transformer replacement
« Reply #2 on: Today at 11:29:40 AM »
There are a couple of reasons:

1) I'd rather not have to use two switches to turn the amp on/off
2) Size - the S/D is quite bulky
3) Heat

I've not been able to find a step-down transformer small enough to reasonably fit into the cabinet.

What specs do I need? - luckily Ampeg have made both the manual and the schematics available for free.

I need a 3a 240VAC 50hz transformer.

Manual: https://ampeg.com/pdf/VH140C.pdf
Schematic: https://ampeg.com/support/files/Schematics/V%20Series/VH-140C/VH-140C%20Schematics.pdf

The transformer wiring is found on the bottom left hand side of page 7 of the schematic.