Oakley SRE330

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Synthbuilder
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Re: Oakley SRE330

Post by Synthbuilder »

Clbraddock wrote: Fri Dec 10, 2021 10:49 pmI checked the pot itself and it measures correctly. Also checked the pot connections and they look okay.
How did you check the pot? The best way is to measure the wiper voltage (middle pin of the pot) with respect to 0V (ground) and wiggle the pot. The wiper voltage should go from -15V to +15V as you rotate the pot from one end to the other. If you can't get to the wiper pin directly you can measure pin 3 of U16 instead.

From what you are saying I would suspect the pot first. Sometimes the internal connection from one of the outer pins to the resistive track can break or become intermittent. This damage often occurs in transit when suppliers put the pots in a big bag all together.

Another part that could be faulty is U16.
Clbraddock
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Re: Oakley SRE330

Post by Clbraddock »

Ok I think it is the pot. I tested it in the circuit and reading pin 3 of U16 it doesn’t vary much from +15 volts regardless of turning the pot. That would prob explain why the rate stays so high. I’ll swap it out for a different pot and that will prob fix it. Thanks for your help! It’s a great chorus.
Clbraddock
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Re: Oakley SRE330

Post by Clbraddock »

Something I’ve noticed is that when the balance pot is set to 50% I lose some volume and bass frequencies. At 0% or 100% there is no volume loss or bass loss. Just curious if this is inherent to the circuit or if it means I have something not working right. I’m guessing it is phase cancellation, but I can’t say for sure.
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Re: Oakley SRE330

Post by Synthbuilder »

Clbraddock wrote: Fri Dec 31, 2021 12:55 amI’m guessing it is phase cancellation...
I think so too.

Once you start to modulate the delay times the cancelled frequencies will move and it won't be so apparent.
Clbraddock
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Re: Oakley SRE330

Post by Clbraddock »

What does each mode emulate. Or, I guess it’s it’s own thing and not an emulation per se, but what is each mode similar to?

I’m pretty sure 3 phase is organ chorus, and Quad is dimension D, but what about stereo and dual?

Also, it seems like when using multi settings that the depth needs to be set fairly low to emulate classic Juno type sounds. Is that the correct way to go about it?

Thanks!!
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Re: Oakley SRE330

Post by Synthbuilder »

Clbraddock wrote: Sat May 28, 2022 12:00 pmWhat does each mode emulate. Or, I guess it’s it’s own thing and not an emulation per se, but what is each mode similar to?
Have a read of page 3 of the User Manual if you haven't done so already. There's a few hints there of what each mode does.

But in a nutshell:

Triple phase is Solina, Logan, et al. It is found on some organs, the Lowrey Symphonic Holiday used it, as did some of the early 80s Yamahas.

Quad ensemble mode is in the style of the Roland RS-505, VP-330, and RS-09.

Stereo is modelled after Roland's stereo chorus on the Juno and others.

Dual is unique but essentially is a half way house between stereo and quad.

None of the them are Dimension D/C as this requires cross channel feedback and some unusual EQing. But the stereo mode can sound similar if you keep the LFO slow and shallow.

The Juno chorus uses triangle modulation and is quite subtle. But note that slower speeds of LFOs require more modulation to have same apparent change in frequency.

Tony
Clbraddock
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Re: Oakley SRE330

Post by Clbraddock »

Thanks Tony. That is exactly the info I was looking for! Really appreciate it.
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