Soundcraft gigrac 1000 st voltage conversion from 110v to 220v

[fguigu]

Hello,


After 7 years in Texas I moved back from the US to europe and I would like to convert my gigrac 1000 st from 110v to 220-240v.

I sent an email to soundcraft who referred me to my local distributor that refuse to sell me the part directly. Moreover
it seems the part price is listed at 500 usd.

does anyone know if i can replace just the transformer, and what type of transformer do I need


thanks in advance

Fred

[Jazz P Bass]

There are a number of external off the shelf stepdown transformers that you can purchase.
That would most likely be the easiest route.
Factor in the current consumption of the amp to get the VA rating.

[diydidi]

Remove link between plugs SP5 & SP6!!!!

[J M Fahey]

Thanks for the tip, but to work with more certainty, can you please post the schematic showing the primary windings?
Or the manual page saying so?
Thanks in advance.

PS: does it haver a conventional transformer or is it an SMPS supply?

[fguigu]

soundcraft gigrac 1000 st

Hello,

here are the schematic

best regards and thanks for your help....

fred

[J M Fahey]

Well, diyididi's suggestion confirmed.
Sorry for asking but I suspected a conventional transformer PSU, in which case it would not have been so simple.
Thanks for the schematic, and ... no way for it to have 500W per channel with those 4 TO3 devices.
Easily 250W; reaching *just* 300W , but no more.
Oh well. They don't specify dirtortion , clippimg or any other spec, so it might well be 500W squarewave.
The protection circuit triggers on 2.8 ohms resistive, consistent with 4 ohm speakers per channel.
Anyway, it still is a lot of power, must be more than enough for a regular Club gig.

[fguigu]

It worked!!

Thanks guys

I just removed the Blue wire between sp5 and sp6 and Bing here is my 220v amp

as a reference you need to remove the amp from the plastic frame
then remove the face (six small screws) to access the blue wire

Fred

my next projects are my crown xls2500 amp and my Mackie srm350 powered speaker

[J M Fahey]

Congratulations.
Remember to keep the jumper and a note explaining the procedure for any future trip into the US.

[52 Bill]

Did you change the primary fuse to the correct value?

[diydidi]

Did you change the primary fuse to the correct value?

YES!! Remember to half the fuse value for 220v.