Official 33609 builder's tread. See 1st page for updates.

[maxheadroom]

i think its possible to use a 31267 as interstage tranny.

http://www.jlmaudio.com/Neve%20transformer%20info.htm
(Wiring 31267 as 10468)

Igor, can you confirm that?

 

[Rob Flinn]

[quote author="maxheadroom"]i think its possible to use a 31267 as interstage tranny.

http://www.jlmaudio.com/Neve%20transformer%20info.htm
(Wiring 31267 as 10468)

Igor, can you confirm that?[/quote]

I don't think you can in this application because I seem to remember looking into this, & you need the centre tap that the 10468 provides, which you don't get when you hook up the 3127 as a 10468.

 

[maxheadroom]

i can't see any centre tap use on the interstage tranny in the schematic.

can you show me?

 

[Rob Flinn]

There is no use of the centre tap on this diagram. It must have been when I was doing another version some years back.

 

[promixe]

Some audio examples:

Can some one run the unprocessed file through their unit AND/OR the original 33609(C/J/JD)?

Original: http://dev.ax-design.com/electronics/33609/33609-test4a.mp3

Compressor IN (THD -4dBu / 100ms RECOVERY / +6 GAIN / 4:1 RATIO): http://dev.ax-design.com/electronics/33609/33609-test4b.mp3 - the 100ms problem was fixed by replacing R10 with 24k

Limiter IN (THD +4dBu / 100ms RECOVERY / FAST attack): http://dev.ax-design.com/electronics/33609/33609-test4c.mp3 - you can hear the distortion. I don't know what it would be attributed to (see next link)

Limiter IN + Compressor IN (setting are as above): http://dev.ax-design.com/electronics/33609/33609-test4d.mp3 - really distorted signal. Compressor smoothes the track, adds gain makeup, and then the limiter freaks out. It sounds like there is an overload somewhere along the limiter sidechain. Where would I look? It calibrated fine though...

Examples C & D sound pretty horrible if you ask me =)
Example B on the other hand really remind me of the classic neve-ish mixing desk sound. That one gives me hope =)

I would really appreciate if someone replicated same settings on their unit (DIY or original) and posted audio. I can provide space for it on my server if needed. Thanks!

 

[Igor]

Hmm...maybe there's an oscillation in limiter's sidechain or something like this. And release time seems too short... Can you try with longer lim. release? But honestly, "B" sounds really nice....some punch and smoothness were added to original.
Anyway, it needs to pass with scope probe thru lim sidechain.
Lemmie think how-to....

 

[Igor]

i think its possible to use a 31267 as interstage tranny.

http://www.jlmaudio.com/Neve%20transformer%20info.htm
(Wiring 31267 as 10468)

Igor, can you confirm that?

Yes, it is possible electrically. Audio-wise....hmmmm......
Personally, don't like it

 

[maxheadroom]

[quote author="Igor"]

i think its possible to use a 31267 as interstage tranny.

http://www.jlmaudio.com/Neve%20transformer%20info.htm
(Wiring 31267 as 10468)

Igor, can you confirm that?

Yes, it is possible electrically. Audio-wise....hmmmm......
Personally, don't like it [/quote]

thanks igor for your answer.
i thought the 31267 (wired as 10468) is the right substitute for the 10468.
can you explain the sound-difference?

 

[Igor]

Just listen. Mind, it is subjective stuff

 

[RedNoise]

Hi guys ,
noob question : which one should I use :

http://fr.farnell.com/multicomp/1ms1t6b11m1qe/switch-spdt/dp/9473610?_requestid=656527

or

http://fr.farnell.com/c-k/7201p3yzqe/switch-dpdt/dp/9575081?_requestid=656440

regarding COM_LIN....

Thanks.

 

[RedNoise]

And :

http://fr.farnell.com/c-k/7103p3yzqe/switch-spdt-ctr-off/dp/9575049?_requestid=656611

For all the other switches , correct???

 

[promixe]

That's weird, for some reason the SPDT link pictures a DPDT switch and DPDT link has a SPDT switch pic on there =)

I've used http://www.newark.com/jsp/search/productdetail.jsp?sku=98K4969 for SPDT

and

http://www.newark.com/jsp/search/productdetail.jsp?sku=98K4953 for DPDT

COM_LIN ??  Are you talking about COM_IN? That's a DPDT switch - so use this one http://fr.farnell.com/c-k/7201p3yzqe/switch-dpdt/dp/9575081?_requestid=656440

 

[RedNoise]

I ordered Igor's bom v3 , but I noticed http://fr.farnell.com/c-k/7103p3yzqe/switch-spdt-ctr-off/dp/9575049?_requestid=745606 are "off" in the center position...on/off/on (is it normal??)
I admit 33609 is a huge complicated project for me , but I want to finish it ....
Toooooooooh!!! ;D
Thanks for the COM_IN link !!!

 

[keithcamilleri]

guys just a quick question, do the motherboards connect with each other with the link on each mother board and finish up with the bypass/link/meter board? so it link (motherboard1) to link (motherboard 2) and to the link onthe bypass board?

thanks

keith

 

[promixe]

guys just a quick question, do the motherboards connect with each other with the link on each mother board and finish up with the bypass/link/meter board? so it link (motherboard1) to link (motherboard 2) and to the link onthe bypass board?

The mainboards don't connect within themselves - the 6-pin headers on the mainboads that connect to the meter/bypass little board link two mainboards for stereo operation when flipping the LINK switch. Otherwise control voltages are independent per board/channel making it two mono compressors.

 

[keithcamilleri]

hey guys something very strange is happening to me when calibrating the first board... when i turn rv-1 nothing happen to the output in db am i missing something? as well compressor power on or off the audio signal still goes through is that normal?

thanks
keith

 

[Igor]

I ordered Igor's bom v3 , but I noticed http://fr.farnell.com/c-k/7103p3yzqe/switch-spdt-ctr-off/dp/9575049?_requestid=745606 are "off" in the center position...on/off/on (is it normal??)
I admit 33609 is a huge complicated project for me , but I want to finish it ....
Toooooooooh!!!
Thanks for the COM_IN link !!!

Ahemmm.....I know, it is reeal headache to read thru all this thread, but this issue was described before. IMHO Farnell changed part Nr's.

hey guys something very strange is happening to me when calibrating the first board... when i turn rv-1 nothing happen to the output in db am i missing something? as well compressor power on or off the audio signal still goes through is that normal?

thanks
keith

YUP, unit is in the bypass. Check relays.

 

[playboss]

im about to use an lo1166 clone in this one. However , the upcoming 2254c specifies the lo1166. So, save those up and pick something else , or what now. 2254 is Very tempting, I'd use 40segment ledmeter somehow, hopefully no "porusha case deal" (nothing personal) this time?

 

[Slenderchap]

I am no expert but.... don't you need an ungapped transformer (LO1173 type) for a 33609..... as the LO1166 would not have sufficient primary inductance to get an appropriate output level from the unit ?.... I am guessing but would you not be about 12dB down on the output as the LO1166 has about 1/4 of the primary inductance of the LO1173..... or am I talking nonsense (often happens)?

Colin
www.audiomaintenance.com

 

[playboss]

"Reply #23 on: February 04, 2008, 11:17:20 am »
Reply with quoteQuote
Quote from: "PimD"

So looks like aLO1166 as 50:600 would work too. +10dB instead of +8 dB (but that could compensated with trimpot RV1)

So seems good too me.
Or does anyone know why it wouldn't work???


It might load the output stage to hard?
I can't think of any other potential problem."


as im quite broke i dont think i will be in the first 2254C run though, hope to obtain it later on .