Supergreen v1.6 - four channels of preamp

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thousandyards

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Jun 7, 2021
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Brisbane
New user with my first post....thanks for having me! Total DIY newbie here, but hoping to get started with it all.

I was given a four channel DIY preamp unit. Popping the top off revealed the Supergreen v1.6 PCB with a JLM power supply. Joe is in my city so I know his gear is solid, which made me think these pres might just be a decent bit of kit.

I've showed these photos to a couple of people who tell me they look well put together (also the impression I got). I've got a few questions though, in case anyone has any experience with them and is feeling generous enough with their time to have a crack at answering. I know Olafmatt is no longer around but I've worked out these are his PCBs. I know it needs a service so I won't be plugging it in before I've had a tech look at it.
  • Apparently based on the AMEK 9098 - true or false?
  • Switches are Phantom, input impedance and polarity - any way of telling which is which based on these photos?
  • Heard there can be noise issues from the channel closest the power supply - thoughts? Is the power supply close enough on these to be an issue?
  • The ventilation slots you can see in the bottom of the case are the same for the lid - is this enough? Would less be a problem? I won't be stacking anything directly on top of it in a rack.
Pics:
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IMG_0437.JPG
64456418961__6A37F977-E2D1-4648-B6B4-D2EFA7AE8266.JPG
IMG_0440.JPG
IMG_0441.JPG

Hope this isn't too presumptuous to chase this many answers on my first post.

Thanks everyone.
 

Whoops

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May 9, 2008
Messages
5,455
Location
Portugal
Hello thousandyards,
Welcome to the forum

Apparently based on the AMEK 9098 - true or false?

Do a search in these forum, there's a lot of threads on the Green Preamp, that information is there for sure

Switches are Phantom, input impedance and polarity - any way of telling which is which based on these photos?

Should be Phantom, PAD (attenuation) and Polarity. I can't understand which is which by the photos, but you can know easilly in some seconds by trying it out.
Did you turned the unit on and used it?

Heard there can be noise issues from the channel closest the power supply - thoughts? Is the power supply close enough on these to be an issue?

Depends, do you have any noise problems or it sound good and clean enough?

The ventilation slots you can see in the bottom of the case are the same for the lid - is this enough? Would less be a problem? I won't be stacking anything directly on top of it in a rack.

No problems with that, the only source of heat are the Voltage regulators, that seem to be screwed to the case, so they use the whole case as a big heatsink.
You don't even need any ventilation holes at all

Best regards
 

thousandyards

Member
Joined
Jun 7, 2021
Messages
5
Location
Brisbane
Hello thousandyards,
Welcome to the forum



Do a search in these forum, there's a lot of threads on the Green Preamp, that information is there for sure



Should be Phantom, PAD (attenuation) and Polarity. I can't understand which is which by the photos, but you can know easilly in some seconds by trying it out.
Did you turned the unit on and used it?



Depends, do you have any noise problems or it sound good and clean enough?



No problems with that, the only source of heat are the Voltage regulators, that seem to be screwed to the case, so they use the whole case as a big heatsink.
You don't even need any ventilation holes at all

Best regards
Hey Whoops - thanks so much!

Great call on the heat sinks. Helps make the case decision A LOT easier!

I haven’t turned it on yet....there’s a resistor I can see needs replacing and it sat in storage for a while before coming to me. The top cover is rusted etc so I know it needs some work. I want a tech to check it over before I go firing it up and things catch fire 😂

I did a search on Supergreen and there wasn’t a heap on the v1.6. I’ll get this serviced and I guess we’ll see how it goes!
 

craig

Active member
Joined
Jun 25, 2009
Messages
37
Location
Australia
There was issues with the orientation of some semi's, diodes perhaps but it's been so long since I built mine I can't be sure if the boards were silkscreened incorrectly or the schems were wrong. I worked it out however and I'm sure someone here will know the definitive answer.
 

Whoops

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Joined
May 9, 2008
Messages
5,455
Location
Portugal
I haven’t turned it on yet....there’s a resistor I can see needs replacing and it sat in storage for a while before coming to me.

Just replace that resistor and try it out and test it.
It seems very well made, probably everything works properly even if it sat down for a while.

No need to be worries about problems we don't have. try it out have fun.
If there's any work to be done after then you will have clear picture of what the problem might be.

For the looks of it , it looks mint
 

thousandyards

Member
Joined
Jun 7, 2021
Messages
5
Location
Brisbane
Just replace that resistor and try it out and test it.
It seems very well made, probably everything works properly even if it sat down for a while.

No need to be worries about problems we don't have. try it out have fun.
If there's any work to be done after then you will have clear picture of what the problem might be.

For the looks of it , it looks mint
My n00bness cannot be understated here! I'm getting a good local tech to give it a once over so it's good to go. Will probably end up selling and upgrading my interface, to be honest! I've got an ISA One that just needs a new XLR wired in....might try my hand at some JLM builds after that to get my skills up

BTW - Whoops, do you know if the v1.6 Supergreen varied much from the v1.5 or v1.4? Apologies - I know these are some old designs. Just want to give my tech everything I can
 
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