The sunn Forum

Sunn Musical Equipment => DIY => Topic started by: Bim1959 on February 08, 2011, 11:54:02 pm

Title: Sunn Concert bass amp
Post by: Bim1959 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....

Title: Re: Sunn Concert bass amp
Post by: Walt-Dogg 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.

Title: Re: Sunn Concert bass amp
Post by: loudthud 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?

Title: Re: Sunn Concert bass amp
Post by: Bim1959 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.

Title: Re: Sunn Concert bass amp
Post by: loudthud 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.