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Author Topic: Sunn Concert bass amp  (Read 4229 times)

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Offline Bim1959

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Sunn Concert bass amp
« on: February 08, 2011, 11:54:02 pm »
Anyone know where I can find the main PBC for this unit? I got one ages ago without the pcb and would love to bring it back to life. Otherwise I'll sell the iron out of it....
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Offline Walt-Dogg

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Re: Sunn Concert bass amp
« Reply #1 on: February 09, 2011, 04:06:40 pm »
I don't think you'd be able to find one anywhere (unless you were extremely lucky), but, with a few high res photos and a schematic I'm sure you could find a skillful enough tech to build you a new one for the amp. Could run you some $$$ though.
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Offline loudthud

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Re: Sunn Concert bass amp
« Reply #2 on: February 09, 2011, 05:57:55 pm »
Do you need the preamp PCB (the one that has the pots on it) or the power amp PCB is the one that connects to the power transistors in back?
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Offline Bim1959

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Re: Sunn Concert bass amp
« Reply #3 on: February 09, 2011, 06:48:36 pm »
The power amp pcb.
I got it from a friend who had it given to him like that. Everything else is included - all the knobs, iron, case, everything - except the power amp pcb. And the funny thing is - it looks like a 9/10 scale.

If I could get someone to get me good clear copies of the top and bottom of the board with the components in place maybe I could make/stuff a board for it.
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Offline loudthud

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Re: Sunn Concert bass amp
« Reply #4 on: February 11, 2011, 03:13:43 pm »
The critical part is the driver transformer, 28-4300. They fail frequently and the only replacement available is from Mercury Magnetics at $170USD ouch! You might consider any other power amp or just making the amp into a preamp.
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