Synth Site: Siel: Opera 6 synth: User reviews Add review
Average rating: 3.8 out of 5
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Oscar from London writes:
I have one and love the sounds but it just recently developed a sickness... 3 notes per octave won't connect to the DCO. Noise and res can be heard on all keys as normal. There seems to be no leaking on the CPU, it's a pretty weird problem. Basically the keys are all over the place, either out of tune or not working. I think there is a way to tune through the operation system somewhere in the 90's but I can't find the setting in the service manual... Anyone have a late service manual?

Rating: 5 out of 5 posted Thursday-May-12-2011 at 11:33
Sandro Codazzi a part-time user from Milan - Italy writes:
Hi all there, i'm a S.I.EL. collector.

I know the Opera 6 just from the samples i've found on the web. I've bought an Opera 6 with serious battery leaking damage.

It seems one of the best products from S.I.EL. in terms of "warm sound" - considering the S.I.EL. warm standards of course ;) - anyway it's better than other model i have , DK 80 (very thin), Cruise (polyphonic parts) or Keytek Cts 2000 this last one is a wavetable synth , but despite this, it sounds "thin".

The internal architecture shows the standard S.I.EL. "low-end" concept.

Inside it, there's a large 6 voices board with 6 control leds, it wears 6 SSM 2044 filter chips, 6 SSM 2056 chips and 6 SSM 2024.

The boards are joined toghether with flat cables that ends on "BURNDI" plastic connectors and normal flat junctions, normal, but very poor quality.

The system board is placed under the keybed It wears 2 SSM 2031 on the upper right corner. Here we can find also the Main CPU and patch assignement control chips. Here is also located the infamous Backup Battery, Three batteries wrapped toghether in a kind of blue-green plastic film. The "-" pole is from where the corrosive acid leaks. Unfortunately there are several chips near it, one group of resistors, two transistors that will be involved for sure in case of leaking. They're too close, so, no way out.

I'm just spending time on this damaged synth to make skill with PCB handling, restoring traces and components substitutions, and, why not, for parts. Anyway, if someone have an Opera 6 without Battery leakage but Blown anyway for other reasons, please contact me, i'm interested to buy it.

Cheers, Sandro.

Rating: 0 out of 5 posted Thursday-Apr-17-2008 at 05:16
Marc a hobbyist user from ITA writes:
The Opera 6 (in some countries was sold with the name DK600 but is the same synth) was a great and very underlooked synth for his times and will become valuable for vintage analog synth collectionists I belive very soon.. it was the natural concurrent of the Roland Juno 60 but had a MIDI interface already in 1983 even if it's only midi in and out.

Main Specs: 6 voice 12 oscilattors 61-note (C-C) 95 programs MIDI velocity-sensitive synth.

some of the sounds of this synth are unique unlike the tired Roland sounds who are basically all the same...if you are interested this synth is becoming pretty rare now as the SIEL as been bought from a company who sold everything and then dismantled it. Sequencial circuit inc made a model of the Opera 6 with a different name (Velocity 6) and a different case it's a Opera 6 with a different name

Mine is unfortunatly broken because and it's my fault short circuited it and i broke the main voice board but I will try to make it repaired by a good tech who can actually use a solder and rapiar stuff without changing the whole board which is by now impossibe to find unless you find another one that has this part working and replace it.

All in all i give it 5/5 I realy miss his sounds and that's not someting i can say from a roland or another commercial product-

Rating: 5 out of 5 posted Wednesday-Apr-18-2007 at 18:26
Andromeda a part-time user from Italy writes:
I have bought this synt in 1983 I still have it but hes now dead because the internal transformer fried. He worked good for about 12 years too wich is not bad for any electronic device. I can say is one of the best synt i owned, song are soft and you can make any sort of song you want after you praticized with the many dials.

Rating: 4 out of 5 posted Wednesday-Dec-14-2005 at 15:53
I believe it's a 3.6V NiCd battery. you can replace it with another, or use a 3V lithium, but if you use a lithium I think you have to replace a resistor with a diode so it doesn't try to charge it.

posted Thursday-May-08-2003 at 02:53
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