Ampeg SVT3 pro PT problem

[grtamp]

Hello everyone,

a friend of mine brought me a Ampeg SVT 3 PRO, telling me when He turn on , the fuse blows.
In fact, the fuse blows even with the secondaries disconnected. could be the transformer fault?

Thanks

[martin manning]

That's a definite possibility. See if you have any continuity to ground from any of the windings. If not then you can try this test: http://www.premierguitar.com/articles/t ... r-tester-1

[grtamp]

Hi Martin , I haven't a neon bulb to do that test !

I have tested the trafo out the amp with a fuse connected to the prim (sec. open). the fuse blows again!

Also I tested the 2 primaries: between black-white 38.11uH 0.544Ohm
between brown violet 19,92uH 0.205Ohm

I tested also between black and violet (White/brown open)and I have measured 0,203Ohm , this makes me think to a internal short!

[xtian]

I tested also between black and violet (White/brown open)and I have measured 0,203Ohm , this makes me think to a internal short!

Yup. Toast.