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Post by svart on Aug 7, 2015 19:43:03 GMT -6
So I won a svt for 400ish. No cabinet, just the head internals.
When powered it would just pop and the fault lights would blink.
I disassembled it, resoldered all connections, and tried again.. Still dead. One of the bias lights wouldn't light.
I traced through and found one resistor open, but not burned, in the bias circuit. I traced this back to the tube it biased and found the tube shorted.
Replaced the resistor and the tube and it works!
Apparently this is a common problem with the svt.
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Post by jimwilliams on Aug 7, 2015 20:01:07 GMT -6
Great job. My bass player used one with the slant 8x10 cab for a few years. I ended up using GE 6550 power tubes, the most reliable. I would take a DVM to gigs as it always needed a bias trim when we moved it. I got tired of that and gave him a Sunn colosium head to use, no maintanence required.
I hurt my back moving that rig a couple of times.
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Post by svart on Aug 7, 2015 20:23:36 GMT -6
I have a svt on loan from a friend for a session in the studio and I love the rock and roll attitude it has.
When I found this one, I knew I had to get it before the loaner gets taken back.
Since it's a studio piece, I'm not terribly concerned about weight.
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Post by tonycamphd on Aug 7, 2015 20:51:54 GMT -6
I just scored 6 matched winged C svetlana 6550's for $50! It was an "as is, untested" auction, as the guy bought them with that matched claim, but never tried them out himself, so i just made the offer and he took it, they work perfectly and sound great, both side bias at about the same point on the screw turns, it's a 90's SVT Classic, it has the green and red biasing led's, makes it a snap to get it straight.
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Post by tonycamphd on Aug 7, 2015 20:55:49 GMT -6
So I won a svt for 400ish. No cabinet, just the head internals. When powered it would just pop and the fault lights would blink. I disassembled it, resoldered all connections, and tried again.. Still dead. One of the bias lights wouldn't light. I traced through and found one resistor open, but not burned, in the bias circuit. I traced this back to the tube it biased and found the tube shorted. Replaced the resistor and the tube and it works! Apparently this is a common problem with the svt. which version is the SVT Chris? |
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Post by svart on Aug 7, 2015 20:59:45 GMT -6
So I won a svt for 400ish. No cabinet, just the head internals. When powered it would just pop and the fault lights would blink. I disassembled it, resoldered all connections, and tried again.. Still dead. One of the bias lights wouldn't light. I traced through and found one resistor open, but not burned, in the bias circuit. I traced this back to the tube it biased and found the tube shorted. Replaced the resistor and the tube and it works! Apparently this is a common problem with the svt. which version is the SVT Chris? Classic. One of the boards says 2010 on it, so I assume it's a newer version. It also seems to have all the recent eco changes, so I'm pretty sure it's only a few years old. |
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ericn
Temp
Balance Engineer
Posts: 14,967 
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Post by ericn on Aug 9, 2015 20:22:26 GMT -6
which version is the SVT Chris? Classic. One of the boards says 2010 on it, so I assume it's a newer version. It also seems to have all the recent eco changes, so I'm pretty sure it's only a few years old. Nice score Chris |
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Post by svart on Aug 10, 2015 7:07:57 GMT -6
So I built a box for it over the weekend and covered it with white tolex. I'll have some pics maybe tonight.
I played it all weekend, sounds killer and sounds just like the other one, so I think it's good to go.
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Post by svart on Aug 10, 2015 11:06:40 GMT -6
A pic of me fitting the panels while building the cabinet.  |
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Post by Randge on Aug 11, 2015 9:20:11 GMT -6
Nice score! Those aren't cheap to buy new.
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Post by levon on Aug 19, 2015 9:07:54 GMT -6
Nothing tops an Ampeg for bass. Congrats!
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