I would at the very least replace the power supply capacitors.

@@tihinter I’m in France. I just checked your T8 demo. Extremely good one, hats off. I didn’t realize the Akai was so close in sound. Pity it lacks the aftertouch. I own it for a short time only but it has become a favorite in the studio.

@ thanx a lot. Keep doing the great work you do, showing rare synths of the past to the world!

@@tihinterthanks, I’ll do that as long I can find or afford them !

Glad it helped. About the poly trombone you can open the unit and try setting the 2 trimmers that set the poly section sounds, the 2 side by side in the middle of the pcb underneath the keyboard, these sets attack and level of the poly sound but they have an effect on timbre too. But if the trumpet sound is same as in the demo and the « brillance » fader has an effect than probably issue is elsewhere. Check for lose wire. Basically the poly section is the main large pcb underneath the keyboard.

Also on my unit first 5 (from the left) mono presets are noticeably louder than the rest. It's not a big deal, just something that I haven't been able to fix...

What you hear is the dco bleeding or probably more exactly the raw signal that build the 2 DCOs. I don’t think you can totally get rid of that even with calibration because at 3.18 I’m doing something that is totally impossible with a stock Poly61: have both DCO off. (notes are held as you can see so that’s why you get the bleeding). On a stock Poly61 you always have DCO1 on so you won’t hear that bleed. Actually there was a bug that I reported to Bob who corrected it: when turning off DCO2 you would still here its fundamental signal in the background, quite audibly. Bob told me it was because he forgot to include an “off” signal that shuts DCO2 completely down, whereas he was simply muting the different analog signals of DCO2. He told me Korg must have been aware of the issue and that’s why they introduced that “off” signal. Probably they didn’t bother with DCO1 because as said you can never turn it off normally. So in use it’s not a problem because you’ll never have both DCO off, you can’t get the filter used as a third oscillator when auto oscillating, it’s nasty.

@@ohm_studi_ohm Ah! So given the mute on DCO2 when off, and DCO1 isn't, with no keys are playing, that noise isn't there? If so - good to know! Given the P61 design, obviously the filter isn't meant to be played. Thanks for getting back to me.

With no keys pressed there is no noise. The pitch of the noise follows tracking so this is definitely no RFI.

@@ohm_studi_ohm Good good! Bien!

This one was recorded dry and there was no post production either, not even EQing.

I recorded this one through the Teisco Vocal 120 so that’s reverb you’re hearing.

@ohm_studi_ohm VERY good to know! Thanks for the reply. So sustain at 0 really gates the notes when key pressure is lifted?

⁠@@McPherson123you will still get a small release for the strings but there is a big difference between leftmost and rightmost fader position. You can hear the difference at around 4.30. Also I forgot to mention I used a sustain pedal that acts on piano and harpsichord. The solo section has no possible editing except for volume.

@@ohm_studi_ohm I appreciate that. Also I really enjoyed your playing in this video. The middle eastern sounding bit is awesome.

Thank you 🙂

I searched and never found the schematics myself. But it’s not too complicated so it should be fixable with starting by checking power supply, op amp, transitors etc

@@ohm_studi_ohm First of all, thanks for responding. The synthesizer turns on, but currently it doesn't play. The last time I turned it on I think the noise was coming. It was my first synthesizer and I would love to have it operational again.

@@maccuel You should bring it to a tech, he will be able to repair it.

@@ohm_studi_ohm thanks i hope found it.

In the UK, it was a kit made by an electronics mag, one famous user was "New Order" or "Joy Division" the original name, it was designed by Tim Orr who formed EMS Music, I built the kit, and to my amazement it worked the first time, and still does today.

Simply added a CD4024 and used the -1 and -2 octaves outputs and rerouted them to the noise pot via a 3 position switch, which allows for level control of the sub. But of course drawback is that you either get Sub Osc or Noise generator.

Thanks. There are many BBD delays out there but not many I can think of that so both spring reverb and BBD delay, and in most case they are the same design rebranded. As far as spring reverb go this unit is not the best sounding unit but since it’s driven by the delay output it sounds great and quite unique. Of course you could mimic the sound by using 2 dedicated units, a delay and spring reverb. There is only one output on the unit and it’s mono. I’d actually like to find another unit to make a stereo one.

Le disque disponible d’une couche magnétique sur son flanc. C’est le même principe que l’écho a bande, une tête d’enregistrement magnétise la couche et les différentes têtes la lit et une dernière l’efface à nouveau. L’avantage principal est que le disquene s’use pas contrairement aux bandes.

@@ohm_studi_ohm Thanks so ill try to find them