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Ampeq SVT-450
Ampeq SVT-450
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Old 13th September 2019, 12:10 PM   #1
Carlosraj is offline Carlosraj  United Kingdom
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Default Ampeq SVT-450

Hi


A friend send me this amp with a power failure problem. Upon checking, I realised that the toroid power transformer has blown. I am trying to order a replacement toroid transformer, but I am not sure of the power rating(VA) and secondary voltages of the transformer. The schematic shows rectified DC voltages of +64V and -64V. Then I guess the secondary center tap AC voltage should be approx 45VAC -0V - 45VAC. Can someone advice what should be the secondary AC voltages and the power rating of the transformer.


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Old 13th September 2019, 12:21 PM   #2
bullittstang is offline bullittstang  United States
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Ampeq SVT-450
If your schematic is correct and you need +/-65Vdc, then yes, I would get a dual 45V secondary toriodal, or a center tap (45-0-45).

Assuming it's a 200/watt @ 8r and and approx 350/watt at 4r and it's a 2-channel amp - I would get a 800-1000VA toroidal. Some would say to go to a 1500VA, but I have never listened to any 200-350/watt amp at clipping in an actual room and not destroy the speakers (or my ears) first, so I think 350+350+20% margin would be adequate.

Also - make sure you measure to ensure the new toroidal will FIT!!!
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Old 13th September 2019, 12:39 PM   #3
Carlosraj is offline Carlosraj  United Kingdom
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OK, thanks
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Old 13th September 2019, 12:46 PM   #4
JonSnell Electronic is online now JonSnell Electronic  United Kingdom
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Don't forget the + - supplies for the low voltage section, you may need a small toroid to run those!
Take a look here;
Toroidal Transformers | RS Components
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Old 13th September 2019, 10:50 PM   #5
PRR is offline PRR  United States
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Weigh the old lump. Pick a new lump of similar weight.
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