Neve 1290 build completed!!

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madriaanse

Well-known member
Joined
Apr 6, 2006
Messages
530
Location
Long Beach, CA
I finally finished my 1290 (1073 mic pre only)! It sounds great - especially at less than $300/ch! A while ago I posted about a PCB I had made with two pre stages, the driver stage, and most of the other components from drawing EH10023 and EN10041. This worked well but it still needed an external rotary switch to make a complete preamp. Wiring the rotaries turned out to be time consuming and a hassle so I designed a new board that features a PCB mounted rotary. This makes wiring very simple. I can build one channel in an evening now.

I wanted to thank this forum and Geoff Tanner for the helpful information!!

Here are some pictures of the prototype:

http://www.musiciansgig.com/neve/

EDIT:
Also, more pictures of my 8 channel version, build documentation here:
http://www.groupdiy.com/index.php?topic=22828
 
Hi 3nity,

no phase, no pad, no trim, just 5db steps - all I need. I did this to keep cost down. ($400/ch includes case, PSU, transformers and rotary) I designed the PCB myself. Then I had a PCB manufacturing company make me 16.

All the best,

M.
 
Good solution with the Grayhill.

I'm sure you could sell some of those boards here. I'd be interested... :grin:
 
[quote author="Purusha"]Hey guys, where do you buy those transformers?[/quote]
Looks like the Carnhill ones via the group buy
 
Digikey will do a special Grayhill order for you. I've checked around, and their prices are about the best.
 
Lowfreq: PSU (JLM ACDC with Amveco TE62085-ND) is in an external cast aluminum enclosures.

tommypiper, synthi: I'd be happy to sell those (2 layer, solder masked, silk screened) boards at $20 USD/ea + shipping.

Purusha: I purchased a batch direct from Carnhill, but it's far easier/cheaper to order from: http://www.audiomaintenance.com/acatalog/Transformers_and_Inductors.html

Anthropic: switches can be ordered from:http://www.audiomaintenance.com/acatalog/switches.html.

All the best,

Martin
 
good!

I`d like to get at least two boards. For international shipping USPS airmail is fine, the boards can go in a letter post and is faster and cheaper than parcel post. use the USPS calculator @ www.usps.com

:thumb:
Synthi
 
[quote author="madriaanse"]To start, here's a "cleaned up" version of drawing EH10023:
http://www.musiciansgig.com/neve/1290.pdf[/quote]

Notice that this is not the 1290 schematic.
It’s a 1073 schem. you edited.
It's probably very similar but it is not the same.
I can send the original 1290 schematic if someone need it.
 
laitue; you are correct, but this is why I mentioned the EH10023 reference. :wink: I've redrawn this 1073 schematic to be less confusing than the others; it was the inspiration for the Neve 1290 boards I designed.

All the best,

Martin
 
i just ordered two of these boards ez1290 and they look great.

thick traces and clean silkscreen. highly recommended. ill let you know how they sound after the carnhill group buy!!!!!!!!!!


thanks Martin!!
 
That looks like the Canare Sepia wire in there. Great wire.
You should check some original schemos, because you will be wanting to tie those trannies to chassis, as well as the output XLR pin 1's.
Mike
 
Buschfsu: glad you like the boards!! I have a feeling you'll like the sound as well!! :)

Sodderboy: Good eye!! That's Canare L4E6AT in there! The only thing you gain by connecting pin 1 of the output is the risk of ground loops. It's not needed since pin 1 is already grounded by the device AFTER the preamp (compressor, A/D converter, etc).

The only change I'll make is incorporate a custom rotary switch that already has some of the pins removed. I'm working with Grayhill on this and will have a part# shortly. These custom switches are only a few dollars more; Grayhill is a great company to work with!!

All the best,

M.
 
Madriaanse, I'll like to build 2 preamp like your.
Can you sell me 2 pcb?

PS your assembly guide rocks! :cool:

Thank you,
Nickos
 
Hi Nickos,

Wowsers, this Carnhill group buy has me completely sold out of PCB's. :green: I'm going to get some more made and will contact you when they arrive. :thumb: In the meantime, could you PM me your email address?

Take care,

M.
 
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