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American Bass 1100.1
American Bass 1100.1
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Old 9th July 2019, 03:06 PM   #1
Deadly Sones is offline Deadly Sones
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Default American Bass 1100.1

Good afternoon.

THis one is driving me crazy... Output section keeps blowing output transistors. Soon as power is applied protection doesn't seem to want to latch. It just clicks in and out super fast then pop! I've replaced the drivers over and over with every new repair attempt. I don't believe they are the problem.

I have made the low voltage "jig". I'm pretty sure I can wire the ground to anywhere in this amps secondaries. They all appear to be wired together. None are separated, that I noticed.

I'm just not sure where to go from there. As far as "local and global feedback". It's my first time trying to use this. If anyone can walk me through it, would be greatly appreciated.

So, 2 things... how can I look at the drive signals coming from the output card to the transistors? What exactly are the differences between local and global feedback? I know the tutorial says a bit about it... but I'm just try to not cause much more damage. Been on this one for awhile. It really has me going in circles here.

Thanks
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Last edited by Deadly Sones; 9th July 2019 at 03:08 PM.
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Old 9th July 2019, 03:09 PM   #2
Perry Babin is offline Perry Babin  United States
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Is it still blowing the outputs with only 15v of rail?

Post a photo of the driver board.

Do you have the tutorial?
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Old 9th July 2019, 03:10 PM   #3
Deadly Sones is offline Deadly Sones
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Good morning Perry. Yes, it's a little older version but had some stuff about the jig in it. I have not tried to hook up the jig yet. There were a few notes about if I didn't do some things I could cause more damage, so thought no better place to ask than here.
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Old 9th July 2019, 03:15 PM   #4
Deadly Sones is offline Deadly Sones
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I'm basically at the point of wiring in the jig. I'm pretty sure on this amp I can tie the ground into any point of this amps secondaries. Then add the pos and neg to rectifier spots. I think I was mostly lost with the local/global feedback stuff.
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Old 9th July 2019, 03:17 PM   #5
Perry Babin is offline Perry Babin  United States
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Email me your IP4 address and you can download the newest version. The last version has photos showing where to make connections for the local feedback resistor.

If it has the low voltage jig in it, it can't be that old.

Using the low votlage rails, you can use something like the IRFP064N for outputs until you find the problem.
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Old 9th July 2019, 03:21 PM   #6
Perry Babin is offline Perry Babin  United States
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See also#5.

If the two secondary grounds are connected together for each transformer, they are likely all tied to the secondary ground. When you have series'd secondaries, you have one transformer (or one transformer for each power supply) with grounds tied together then the other secondary 'grounds' are separated and go to the output of the previous secondary winding.
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Old 9th July 2019, 03:37 PM   #7
Deadly Sones is offline Deadly Sones
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They all seem to be connected and bussed together. Sent you an email.
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Old 9th July 2019, 04:09 PM   #8
Deadly Sones is offline Deadly Sones
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With 12.0v and 3 amp supply allowed, the test jig connected I have +16.6ish and -16.4ish. Should I make an adjustment or can I use this? I haven't applied it to the rails yet
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Old 9th July 2019, 04:13 PM   #9
Deadly Sones is offline Deadly Sones
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It seems to fluctuate from +/-14.5v to 17.5 sometimes
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Old 9th July 2019, 05:19 PM   #10
Perry Babin is offline Perry Babin  United States
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The voltage is OK. The limiting causes the voltage to vary as the load varies.

Does the amp produce rail-rail oscillation with the limiter?
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