Hey guys, my 9090 recently started blowing the speaker output fuses even with no load. I've taken it into my local audio repair place and the technician advises that the output transistors are all gone and the parts are impossible to come by in Australia. Does anyone know of a store either in Australia or elsewhere where I can buy these parts? I'm desperate as the Sansui 9090's are pretty rare in Australia and I only recently purchased it, I absolutely adore the sound quality and power and don't want to let it go :-(

Any help much appreciated!

Davy

Hi Davy, welcome to AudioKarma. The 9090 was originally equipped with 8Sanken 2SC1116A transistors. You can replace the original output transistors with modern OnSemi transistors, MJ21194. They should be available in Austraila from any good electronics supply house.

More to the point, you need to find the root cause of the problem. The outputs typically don't fail for no reason.

Let us know the outcome of the repair.

- Pete

Also, you can get the originals here (http://woodang.net/Transistors.htm).

- Pete

Thanks LB! The scenario was that I took over a business that had a number of speakers already wall mounted (very high) throughout three seperate areas (it's a restaurant), the speakers were wired through two volume controls and from there into the amp. The amp kept blowing fuses, I'd replace, it'd run ok then blow em again. I finally took the volume controls apart and one of them appeared fried so I bypassed it for that particular channel, it also transpired that the speakers were a mix of 4 and 8ohm but by this time the 9090 had already thrown in the towel. I'm a newbie at this kinda stuff so it's my own fault really, should've got an expert in to wire us up but we were on a very tight budget...there's a moral there somewhere!

More than two pairs of 8 ohm speakers, or more than one pair of 4 ohm speakers will fry almost any amplifier. Tough way to learn that.

- Pete

Tell me about it! I think we had one pair of 4ohm on channel A and a 4 and an 8 on channel B....wish the wife hadn't been so keen on cutting corners on cost :nono:

Thanks for the info, I'll let you know how they go with the repair, hope it's a reasonable bill....

I'll also add the serial number to the database when I get it back...

Cheers

Hey guys, my 9090 recently started blowing the speaker output fuses even with no load.

Any help much appreciated!

Davy

Could you elaborate on which fuses are blowing? The 9090 does not have "speaker output fuses" (although some of the 9090DB have them).

Another question could you post some pictures of the rear of the unit? If it is a unit that originally sold in Australia it has a somewhat different rear panel than the units sold here in the US.

a unit that originally sold in Australia has a somewhat different rear panel than the units sold here in the US.
Really ? I didn't know. What's the difference ?

I believe (based on the schematics of the units) that the units sold in Australia and in England have three prong power cords and don't have AC outlets on the rear panel.

Probably the 7amps on the driver board are the ones blowing.

Got the baby back fully repaired, the guy even managed to fix the faulty FM tuner section! Almost killed myself putting it up on a high shelf where it lives now (behind the bar) looks fantastic but boy is that sucker heavy and unbalanced due to the location of the power supply. I'm kinda keen to steal it for home use but the wife has fallen in love with it at the business!

Anyone know anything about a Monarch Series 8 8000 integrated amp? Just bought one on ebay...It's Japanese circa 1975 I think about 50wpc but not sure. Looks great though, can't wait to fire her up...thanks all for your help before (incidentally repair cost AU$250).

Cheers,

Davy