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Post by the other mark williams on Mar 26, 2021 16:02:35 GMT -6
I'm wondering if maybe the power supply on my Stam 1073MPA is going bad. Has anyone else had that happen here? Just a few days ago, there was suddenly a hum/rumble that's never been there before. It's loud. Completely unusable in its current state. I thought at first it sounded like a grounding problem, and maybe it is, but nothing's changed in that rack in a long, long time, so it would be surprising to me if suddenly a grounding problem happened out of nowhere. It affects both channels equally. I've tried the same mic and cable into my other pres, and no problem exists on anything else. stam ? Have you seen these power supplies go down on occasion? If so, what am I looking for to order a replacement from somewhere? |
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Post by Vincent R. on Apr 1, 2021 4:52:17 GMT -6
I hope someone at least PMed you to help you with this issue.
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Post by the other mark williams on Apr 1, 2021 10:43:13 GMT -6
I hope someone at least PMed you to help you with this issue. Thanks, Vincent. I filled out the contact form on the Stam website the same day I made the post here. Didn't hear anything for a couple days, so I emailed Josh. He got back to me pretty quick and got me in touch with Teo at Stam Audio. It's going to be a really tricky situation, I'm afraid. Josh said they don't have any parts for my model (which is a mkI), and that they would potentially have to convert my unit to a mkII, because they don't make the mkI anymore. Teo said it's "out of factory warranty." So who knows where this is going to go. I'd rather not send it to Chile if at all possible. I'm going to try and hook up with a local tech around here and see if he'd be willing to take a look at it, but I'm admittedly a bit afraid that I have a boat anchor on my hands and nothing I can do about it without spending a bunch of money. So I'm quite frustrated at the moment. |
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Post by brenta on Apr 1, 2021 11:22:08 GMT -6
Yikes. I've got an mk1 too. I guess I'll cross my fingers and hope nothing ever goes wrong with it.
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Post by stam on Apr 1, 2021 12:31:16 GMT -6
I'm wondering if maybe the power supply on my Stam 1073MPA is going bad. Has anyone else had that happen here? Just a few days ago, there was suddenly a hum/rumble that's never been there before. It's loud. Completely unusable in its current state. I thought at first it sounded like a grounding problem, and maybe it is, but nothing's changed in that rack in a long, long time, so it would be surprising to me if suddenly a grounding problem happened out of nowhere. It affects both channels equally. I've tried the same mic and cable into my other pres, and no problem exists on anything else. stam ? Have you seen these power supplies go down on occasion? If so, what am I looking for to order a replacement from somewhere? I will shot you an email to see what we can do to fix it |
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Post by Vincent R. on Apr 1, 2021 12:38:47 GMT -6
I hope someone at least PMed you to help you with this issue. Thanks, Vincent. I filled out the contact form on the Stam website the same day I made the post here. Didn't hear anything for a couple days, so I emailed Josh. He got back to me pretty quick and got me in touch with Teo at Stam Audio. It's going to be a really tricky situation, I'm afraid. Josh said they don't have any parts for my model (which is a mkI), and that they would potentially have to convert my unit to a mkII, because they don't make the mkI anymore. Teo said it's "out of factory warranty." So who knows where this is going to go. I'd rather not send it to Chile if at all possible. I'm going to try and hook up with a local tech around here and see if he'd be willing to take a look at it, but I'm admittedly a bit afraid that I have a boat anchor on my hands and nothing I can do about it without spending a bunch of money. So I'm quite frustrated at the moment. I can imagine. Hopefully they'll have a solution of some kind for you. I'm lucky enough to have a tech out here who has helped me with little issues with my gear and usually at a decent rate. Finding one isn't a bad idea. |
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Post by the other mark williams on Apr 1, 2021 12:56:47 GMT -6
I'm wondering if maybe the power supply on my Stam 1073MPA is going bad. Has anyone else had that happen here? Just a few days ago, there was suddenly a hum/rumble that's never been there before. It's loud. Completely unusable in its current state. I thought at first it sounded like a grounding problem, and maybe it is, but nothing's changed in that rack in a long, long time, so it would be surprising to me if suddenly a grounding problem happened out of nowhere. It affects both channels equally. I've tried the same mic and cable into my other pres, and no problem exists on anything else. stam ? Have you seen these power supplies go down on occasion? If so, what am I looking for to order a replacement from somewhere? I will shot you an email to see what we can do to fix it Thanks so much, Josh! I'm just seeing your emails (+ emails from Teo). I'll have time to respond later tonight. I really, really appreciate your personal involvement on this. |
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Post by tkaitkai on Apr 12, 2021 17:30:15 GMT -6
the other mark williams Did you ever get this sorted out? I have a similar issue, except mine is more subtle. It's a faint rumble and I have to seriously crank things to hear it. Even stranger, it sort of comes and goes, and it happens with multiple pieces (Wunder PEQ2R + Golden Age COMP-3A). Here's a clip: https%3A//soundcloud.com/tkaitkai/mic-pre-noiseI had to gain this up by +40dB or so, so again, more subtle than what you're describing, but I wonder if this sounds similar at all to yours? My first guess would be a grounding issue, but I'm also guessing it could be some oxidation on the pots or push buttons... maybe using some DeoxIT could help here.
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Post by the other mark williams on Apr 12, 2021 18:52:52 GMT -6
the other mark williams Did you ever get this sorted out? I have a similar issue, except mine is more subtle. It's a faint rumble and I have to seriously crank things to hear it. Even stranger, it sort of comes and goes, and it happens with multiple pieces (Wunder PEQ2R + Golden Age COMP-3A). Here's a clip: https%3A//soundcloud.com/tkaitkai/mic-pre-noiseI had to gain this up by +40dB or so, so again, more subtle than what you're describing, but I wonder if this sounds similar at all to yours? My first guess would be a grounding issue, but I'm also guessing it could be some oxidation on the pots or push buttons... maybe using some DeoxIT could help here. After further investigation on my part, my situation actually involves a loud buzzing whenever phantom is engaged, and also a big difference (10-15dB) in gain between Channel 1 and Channel 2. Mine is currently in the shop with Jeff Stielau in Connecticut. He's the tech Stam works with on the East Coast (USA), and has worked on a number of these exact units, apparently. Mine isn't under warranty anymore, so I'm going to have to eat the cost. And I don't know what the cost is going to be yet. |
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Post by malkit on Apr 13, 2021 6:25:09 GMT -6
Hey Mark,
I had a similar issue with mine. Channel 1 of my MPA went dead and seemed to want to broadcast the local radio, instead of my own music. Just out of warranty, but not used frequently. I wound up driving the unit out to Jeff for repairs (and to save on shipping), and I’m glad I did- it came to a little over 170. Took the lady for some pizza in New Haven while we waited.
I talked to him for a bit- really nice guy and very capable- Sounded like 170-200 is the magic number for MPA repairs.
Good luck,
Malkit
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Post by din on Apr 13, 2021 13:58:47 GMT -6
You many want to take the lid off and see if anything is amiss. On the one that I had, the transformers were held in place by a bit of double-sided sticky tape (seriously) which lost its adhesion not long after I got it. I noticed when I moved the unit from one rack to another and heard a clanging sound. Pretty shoddy workmanship, if you ask me.
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Post by jacobamerritt on Apr 13, 2021 14:22:08 GMT -6
After further investigation on my part, my situation actually involves a loud buzzing whenever phantom is engaged, and also a big difference (10-15dB) in gain between Channel 1 and Channel 2. Mine is currently in the shop with Jeff Stielau in Connecticut. He's the tech Stam works with on the East Coast (USA), and has worked on a number of these exact units, apparently. Mine isn't under warranty anymore, so I'm going to have to eat the cost. And I don't know what the cost is going to be yet. How long was the warranty initially? |
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Post by the other mark williams on Apr 13, 2021 17:52:13 GMT -6
After further investigation on my part, my situation actually involves a loud buzzing whenever phantom is engaged, and also a big difference (10-15dB) in gain between Channel 1 and Channel 2. Mine is currently in the shop with Jeff Stielau in Connecticut. He's the tech Stam works with on the East Coast (USA), and has worked on a number of these exact units, apparently. Mine isn't under warranty anymore, so I'm going to have to eat the cost. And I don't know what the cost is going to be yet. How long was the warranty initially? Good question - I'm not even sure. I actually bought mine secondhand from Joshua Carney (on YouTube: MusicTechHelpGuy), and it wasn't under warranty anymore when I got it. |
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ericn
Temp
Balance Engineer
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Post by ericn on Apr 13, 2021 18:15:57 GMT -6
You many want to take the lid off and see if anything is amiss. On the one that I had, the transformers were held in place by a bit of double-sided sticky tape (seriously) which lost its adhesion not long after I got it. I noticed when I moved the unit from one rack to another and heard a clanging sound. Pretty shoddy workmanship, if you ask me. Considering some of the automotive 3M double sided tape based adhesives that are out there, not necessarily a bad thing to use. |
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Post by stam on Apr 14, 2021 6:30:50 GMT -6
After further investigation on my part, my situation actually involves a loud buzzing whenever phantom is engaged, and also a big difference (10-15dB) in gain between Channel 1 and Channel 2. Mine is currently in the shop with Jeff Stielau in Connecticut. He's the tech Stam works with on the East Coast (USA), and has worked on a number of these exact units, apparently. Mine isn't under warranty anymore, so I'm going to have to eat the cost. And I don't know what the cost is going to be yet. How long was the warranty initially? The standard warranty now is 2 years. NOS tubes excluded. |
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Post by stam on Apr 14, 2021 6:35:27 GMT -6
You many want to take the lid off and see if anything is amiss. On the one that I had, the transformers were held in place by a bit of double-sided sticky tape (seriously) which lost its adhesion not long after I got it. I noticed when I moved the unit from one rack to another and heard a clanging sound. Pretty shoddy workmanship, if you ask me. Considering some of the automotive 3M double sided tape based adhesives that are out there, not necessarily a bad thing to use. Well, it certainly didn't save any money. At the time (this is one of my first units) I did things in an artisan way, I had no L brackets to secure transformers so we used double sided tape. You could even lift up the entire unit holding just the transformer. Those L brackets are cheaper than tape and it was extremely effective. Transformers are now PCB mounted on these units and designs have been vastly improved the past 3 years. The new 1073MPA MK2 will have a major and unique upgrade as well which will be revealed in due course. |
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