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Post by mrholmes on Aug 10, 2020 4:30:36 GMT -6
Jesus.
Sure I saw consoles more than one time, but getting something that is more like a real console myself feels a bit scary. It is huge and I need to rethink my setup now.
Good News:
+
It was just 150€
+
All channels all subgroups and all outs work as expected. Some have level differences.
I cleaned and lubed the first two modules also cleaned the XLR with pipe cleaners and lube and voilà they are nearly the same with a 1 kHz test tone.
Bad News:
+
PSU is loud as hell it makes a loud BRRRRRRRRRRRRRRR. Is this normal for external desk PSU?
+ I forgot how near the solder joints are with the OP Amps. Is there any special soldering tip for the decoupling?
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ericn
Temp
Balance Engineer
Posts: 14,934
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Post by ericn on Aug 10, 2020 6:04:02 GMT -6
Jesus.
Sure I saw consoles more than one time, but getting something that is more like real console myself feels a bit scary. It is huge and I need to rethink my setup now.
Good News:
+
It was just 150€
+
All channels all subgroups and all outs work as expected. Some have level differences.
I cleaned and lubed the first two modules also cleaned the XLR with pipe cleaners and lube and voilà they are nearly the same with a 1 kHz test tone.
Bad News:
+
PSU is loud as hell it makes a loud BRRRRRRRRRRRRRRR. Is this normal for external desk PSU?
+ I forgot how near the solder joints are with the OP Amps. Is there any special soldering tip for the decoupling?
PICS OPEN LINKS IN BROWSER:
Most fans are easily replaced with quiet ones Savart is the one who would be best to tell you what the best options are. My best tips for soldering those opamps. 1. A real vacuum desolidering tool. 2. Small tips 3. Reading glasses! I buy cheap, dollar store reading glasses just for soldering after using a pair my mother left here.
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Post by mrholmes on Aug 10, 2020 7:16:54 GMT -6
Jesus.
Sure I saw consoles more than one time, but getting something that is more like real console myself feels a bit scary. It is huge and I need to rethink my setup now.
Good News:
+
It was just 150€
+
All channels all subgroups and all outs work as expected. Some have level differences.
I cleaned and lubed the first two modules also cleaned the XLR with pipe cleaners and lube and voilà they are nearly the same with a 1 kHz test tone.
Bad News:
+
PSU is loud as hell it makes a loud BRRRRRRRRRRRRRRR. Is this normal for external desk PSU?
+ I forgot how near the solder joints are with the OP Amps. Is there any special soldering tip for the decoupling?
PICS OPEN LINKS IN BROWSER:
Most fans are easily replaced with quiet ones Savart is the one who would be best to tell you what the best options are. My best tips for soldering those opamps. 1. A real vacuum desolidering tool. 2. Small tips 3. Reading glasses! I buy cheap, dollar store reading glasses just for soldering after using a pair my mother left here.
Thanks for the glasses tip. It is so small that I ask myself if I have the right tools.
The PSU Transformer is making the noise the PSU is without a fan!
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Post by Martin John Butler on Aug 10, 2020 7:55:42 GMT -6
Well, congratulations and good luck! I don't think I could have passed that by either at that price.
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Post by kcatthedog on Aug 10, 2020 8:05:41 GMT -6
You will need a desoldering station to remove op amps and to make certain through holes are clear.
The psu can need modding too or just but a new one!
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Post by keymod on Aug 10, 2020 8:17:33 GMT -6
Nice Score! Congratulations.
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Post by mrholmes on Aug 10, 2020 8:37:05 GMT -6
Well, congratulations and good luck! I don't think I could have passed that by either at that price.
No discussion I mean 150 euro and it still works. I started the cleaning already the caps look like someone did a recapping a few years ago there is not a single cap going bad. At least not what I can see with my eyes.
Did a short test how the preamps sound and wow they sound good, I was not expecting that they deliver something nice.
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Post by svart on Aug 10, 2020 8:50:57 GMT -6
So is it actually buzzing, or is there a clogged fan?
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Post by mrholmes on Aug 10, 2020 8:56:23 GMT -6
So is it actually buzzing, or is there a clogged fan?
THE PSU makes a buzz and it is the transformer. All caps look good, but hey its a 23 years old PSU.
There is no noise or hum in the audio path🙏
The PSU buzz gets louder under load from the delta.
I may start recapping the PSI first?
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Post by jrasia on Aug 10, 2020 10:39:21 GMT -6
Probably the windings on transformer started to open up.
Or maybe it's not secure and vibrating a little.
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Post by svart on Aug 10, 2020 10:45:14 GMT -6
Loud buzzing can also mean the load is very large.
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Post by kcatthedog on Aug 10, 2020 10:51:11 GMT -6
But it’s just the small board, can’t need much in terms of amps ?
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Post by mrholmes on Aug 10, 2020 10:54:06 GMT -6
Loud buzzing can also mean the load is very large.
I googled about this PSU and other owners had the same problem most of them say it was gone with recapping.
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Post by svart on Aug 10, 2020 11:07:15 GMT -6
Loud buzzing can also mean the load is very large.
I googled about this PSU and other owners had the same problem most of them say it was gone with recapping.
Caps going bad typically leak lower frequency current, so it's loading down the transformer. I bet the rectifiers get hot too..
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Post by kcatthedog on Aug 10, 2020 12:00:40 GMT -6
If you get that psu working fine and minimize mods: you should be fine interns of in surge and normal operating parameters .
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Post by mrholmes on Aug 10, 2020 12:59:43 GMT -6
If you get that psu working fine and minimize mods: you should be fine interns of in surge and normal operating parameters . Yes that was my thinking too. Get the PSU to work properly and work with coonsole and do the rest later. As Svard said, they sound good even without the modification. I would love to do the op amp decoupling but I know my brain with those works it runs out of patience fast and thats a guarantee that shit happens.
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Post by johneppstein on Aug 10, 2020 13:18:14 GMT -6
So is it actually buzzing, or is there a clogged fan?
THE PSU makes a buzz and it is the transformer. All caps look good, but hey its a 23 years old PSU.
There is no noise or hum in the audio path🙏
The PSU buzz gets louder under load from the delta.
I may start recapping the PSI first?
Congratulations on your new console!
The buzz is mechanical noise produced by the intense magnetic fields in the tranny vibrating one or more loose core laminations or possibly loose bolts holding it together. First thing to do is to tighten all the screws and bolts associated with the tranny. If that doesn't help you'll probably either need a replacement or have the transformer rewound.
It gets louder under load because it's sucking more current.
The other possibility is to mount the PS in another room.
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Post by mrholmes on Aug 10, 2020 13:44:48 GMT -6
THE PSU makes a buzz and it is the transformer. All caps look good, but hey its a 23 years old PSU.
There is no noise or hum in the audio path🙏
The PSU buzz gets louder under load from the delta.
I may start recapping the PSI first?
Congratulations on your new console!
The buzz is mechanical noise produced by the intense magnetic fields in the tranny vibrating one or more loose core laminations or possibly loose bolts holding it together. First thing to do is to tighten all the screws and bolts associated with the tranny. If that doesn't help you'll probably either need a replacement or have the transformer rewound.
It gets louder under load because it's sucking more current.
The other possibility is to mount the PS in another room.
Thanks I will check this too but it makes sense to recap as well as to decouple the regulators. I don't own an oscilloscope if everything fails I need to find a new tech...the one I trusted is OOB...
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Post by johneppstein on Aug 10, 2020 18:58:04 GMT -6
Congratulations on your new console!
The buzz is mechanical noise produced by the intense magnetic fields in the tranny vibrating one or more loose core laminations or possibly loose bolts holding it together. First thing to do is to tighten all the screws and bolts associated with the tranny. If that doesn't help you'll probably either need a replacement or have the transformer rewound.
It gets louder under load because it's sucking more current.
The other possibility is to mount the PS in another room.
Thanks I will check this too but it makes sense to recap as well as to decouple the regulators. I don't own an oscilloscope if everything fails I need to find a new tech...the one I trusted is OOB... Well, you should recap too. The basic trannie work should take maybe 10 minutes with a screwdriver and wrench. It's easy. It's also pretty routine in cases like this.
Consider yourself lucky you don't have something like my Studer - it contains FIVE seperate power supplies...
BIG ones.
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Post by mrholmes on Aug 10, 2020 20:03:40 GMT -6
Thanks I will check this too but it makes sense to recap as well as to decouple the regulators. I don't own an oscilloscope if everything fails I need to find a new tech...the one I trusted is OOB... Well, you should recap too. The basic trannie work should take maybe 10 minutes with a screwdriver and wrench. It's easy. It's also pretty routine in cases like this.
Consider yourself lucky you don't have something like my Studer - it contains FIVE seperate power supplies...
BIG ones.
I see the refurbishing as an hobby its over three decades ago that I was good in ham radio electronics. There was not a single weekend we were not soldering something. My first project after basic training was a small mic pre for a very small elektret microphone. Yes I needed some help from the old dogs. I think I can make the PSU Work....
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Post by deehope on Aug 11, 2020 16:35:37 GMT -6
Jesus.
Sure I saw consoles more than one time, but getting something that is more like real console myself feels a bit scary. It is huge and I need to rethink my setup now.
Good News:
+
It was just 150€
+
All channels all subgroups and all outs work as expected. Some have level differences.
I cleaned and lubed the first two modules also cleaned the XLR with pipe cleaners and lube and voilà they are nearly the same with a 1 kHz test tone.
Bad News:
+
PSU is loud as hell it makes a loud BRRRRRRRRRRRRRRR. Is this normal for external desk PSU?
+ I forgot how near the solder joints are with the OP Amps. Is there any special soldering tip for the decoupling?
PICS OPEN LINKS IN BROWSER:
Reading glasses! I buy cheap, dollar store reading glasses just for soldering after using a pair my mother left here. you aint lying lol since getting into this I have no issues soldering at all. its the damn size of the parts that's killing me. I can't see anything. that and a good set of helping hands is what I needed.
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Post by mrholmes on Aug 15, 2020 14:55:59 GMT -6
svart ericn johneppstein We have a family emergency but my ex said it may unload my stress if I do refurbish the PSU for the rest of the day. I did that and it took me 4 hours, I also decoupled the regulators. The PSU noise went down by 80%. The voltage for the console is right @ ø17V +- But the phantom power voltage is not 48V its 50.8V. Is this a problem?
Thanks for your help... 🙏
Cheers Holmes
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Post by kcatthedog on Aug 15, 2020 15:30:07 GMT -6
Is that measured at the board pre?
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Post by mrholmes on Aug 15, 2020 16:51:29 GMT -6
Is that measured at the board pre? YES!
Meanwhile, I think the voltage regulators are gone bad. All three diodes light up on the front panel, something is going wrong.
I also measure crazy low voltages on the trimmers for +48 and - 17 + 17.
Its like heavens know what I need.
A friend called two hours ago he found a cool new tech in town.
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Post by svart on Aug 15, 2020 18:18:51 GMT -6
svart ericn johneppstein We have a family emergency but my ex said it may unload my stress if I do refurbish the PSU for the rest of the day. I did that and it took me 4 hours, I also decoupled the regulators. The PSU noise went down by 80%. The voltage for the console is right @ ø17V +- But the phantom power voltage is not 48V its 50.8V. Is this a problem?
Thanks for your help... 🙏
Cheers Holmes Nope. I bet that's unloaded voltage. Put a mic on it and I bet it goes down a little.
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