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Post by jimwilliams on May 30, 2014 10:36:23 GMT -6
Can you do a THD+noise sweep on it when done? The last Neve versions I tested had about .4% THD, rather dirty.
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Post by svart on May 30, 2014 12:07:59 GMT -6
I'll see if any of my equipment here at work can do it, but this is a hybrid, so the audio amp section is essentially a 2254/1272. The attenuator and sidechain come from the 33609J.
All of the equipment here is RF related. I might be able to do IMD/IP2/IP3 type measurements at higher frequencies, like 10Kish. I can do some direct spectrum captures with some arbitrary CW input and measure each harmonic and figure things like that.. But again I don't think my analyzers go down into the Hz range.
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Post by svart on Jun 2, 2014 12:50:38 GMT -6
Haven't really worked on these the last few days. The chassis should be delivered today so I can start mounting things. I still haven't decided on the final front panel design yet though.
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Post by svart on Jun 5, 2014 12:25:17 GMT -6
 I think that's what it'll look like. Not sure it'll be black though. Black is the cheapest of the colors and you don't need infill. Any of the other colors need infill on the engravings. |
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Post by kevinnyc on Jun 5, 2014 12:58:40 GMT -6
Very impressive indeed!
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Post by svart on Jun 5, 2014 13:00:37 GMT -6
I think I'm changing the gain scale to 1-10 and adding a switch for "fast" and "slow" compression attack. I just don't have room for another rotary switch/pot.
You'll also see the offset threshold switches. I rather dislike having to do that, but for 7$ a piece I guess I can't complain too much. I couldn't find any 24 position switches that were smaller except for the elmas which are hard to get and 50$+ each..
Ordered the front panel. Decided to make it blue. I'll do my own infilling to save 10$. Spray the panel with white spray paint, and then use a rag soaked in acetone, swipe it across the face. It should leave only what was in the engraved valleys. Or, use a small squeegee to wipe the paint across the face.
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Post by svart on Jun 12, 2014 18:10:02 GMT -6
I haven't really worked on this the past week. I'm at a point where I need the front panel so I can mount all the controls and finish wiring. I got the chassis the other day, it was a par-metal second on Ebay, so I got it for a few bucks cheaper than their website.
I also got the remaining input transformers and the meters from Hairball. The frontpanel shipped today so I suppose I'll see it next week at some point. Getting kinda excited to get this thing together finally.
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Post by svart on Jun 20, 2014 8:55:59 GMT -6
So the last couple weeks have been slow due to the day job, recording and life. I have started the chassis work, mounting the transformers and the PCBs. I also received the front panel yesterday. I drilled the holes after I took this picture though..  tonight I'll clean it up and do the infilling on the engravings. Otherwise, I think I'll be doing some assembly this weekend. |
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Post by jeromemason on Jun 20, 2014 13:30:23 GMT -6
Looking good!
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Post by svart on Jun 20, 2014 19:55:03 GMT -6
 Starting to come together a bit. |
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Post by svart on Jun 20, 2014 21:08:43 GMT -6
You can see the infilling in the pic above. I cleaned the panel with acetone, then sprayed white spray paint over it. Before it dried, I took an acetone soaked rag and wiped the paint off. It's messy but easy. I made a couple passes and let it dry. There was a paint film on the panel still, so another pass with a clean rag soaked in acetone took that off.
I did screw one thing up so far, and that is the boxes on the front panel. I made them just a little too wide so the screws that mount the front panel are much too close and partially cover the lines. Oh well, live and learn. The lettering is a little small too. I probably should have made it a tad larger. I also need to lengthen the wires connecting the right channel limiter recovery switch, they are a little short to reach it. The rest look to be long enough though.
I also want the knobs I bought to sit almost flush with the front panel. I'll need to trim off a little of the shafts on the switches and pots for this to happen with these knobs.
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Post by svart on Jun 21, 2014 19:36:21 GMT -6
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Post by svart on Jun 21, 2014 19:40:14 GMT -6
So I broke one of the 24pos switches. I threaded the barrels of them and screwed them into the front panel. While I was tightening it, the barrel split. Good thing I bought an extra..
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Post by tonycamphd on Jun 22, 2014 9:29:12 GMT -6
Looking friggin great svart!
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Post by kevinnyc on Jun 25, 2014 14:17:47 GMT -6
That looks supremely badass...
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Post by svart on Jun 25, 2014 19:43:41 GMT -6
thanks guys! I have the next couple nights off from recording so I'll be back on it.
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Post by svart on Jun 30, 2014 13:16:12 GMT -6
I did some more wiring in the box and replaced the broken 24pos switch. nothing much else new about the project other than just doing a lot of little stuff to get it ready to finish.
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Post by tomas1808 on Jul 20, 2014 16:40:50 GMT -6
Any news?? Its looking great!
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Post by svart on Jul 20, 2014 19:54:39 GMT -6
I've almost finished wiring everything. I haven't tried powering it up with both channels hooked up, but thats coming soon!
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Post by tonycamphd on Jul 20, 2014 23:48:17 GMT -6
svart you should put some chickenhead knobs on that bad boy! 
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Post by svart on Jul 21, 2014 6:42:46 GMT -6
svart you should put some chickenhead knobs on that bad boy! LOL. NO. I like the modern neve knobs better..  |
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Post by svart on Jul 25, 2014 22:28:33 GMT -6
  So, The beast is together and working! I have two issues right now, the left channel has about 5db more gain than the left. The meters are waaaay off from where they need to be and they are well outside the adjustment range even though the originals were supposed to be 1mA meters and these are 1mA meters. |
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Post by svart on Jul 26, 2014 9:36:08 GMT -6
So today before recording I need to try to figure out why one side has a little more gain. It also has a little higher noise floor too. Otherwise, listening it sounds pretty good. It can do a lot of compression before getting crunchy, and the compression stays very "round" sounding.
I built this to put on the drums, but I think it's going on the mix bus because the limiter works well and sounds pretty good.
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Post by svart on Jul 26, 2014 11:25:33 GMT -6
gain problem was that the gain pots were mismatched. That's fixed.
The higher noise seems to be related to the JFETs on the front end. One of them on the channel that was noisy was sensitive to the touch too, so it needs replacing but I don't have any more. Time to order some.
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Post by rocinante on Jul 26, 2014 14:50:57 GMT -6
Where are you getting your collet knobs? I have a w492 I'm finishing. Selco?
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