|
Post by Johnkenn on Jun 30, 2019 14:15:49 GMT -6
I fail to see how slightly loosening the set screw on the toroid and rotating it while it's plugged in is an issue. I guess it depends how PSU is setup but a lot of audio gear has the toroid separate from the PSU. Which is where one wrong slip can end your life. Providing you're careful with watching the wires and the slack they have you should be fine. Stay the hell away from the PSU though. Wear a thick rubber glove too. Well, I completely don’t know what I’m talking about, but why chance it?
|
|
|
Post by Blackdawg on Jun 30, 2019 17:01:11 GMT -6
I fail to see how slightly loosening the set screw on the toroid and rotating it while it's plugged in is an issue. I guess it depends how PSU is setup but a lot of audio gear has the toroid separate from the PSU. Which is where one wrong slip can end your life. Providing you're careful with watching the wires and the slack they have you should be fine. Stay the hell away from the PSU though. Wear a thick rubber glove too. Well, I completely don’t know what I’m talking about, but why chance it? I guess more than anything its a comfort level thing. If you're not comfortable with doing it, don't. If you're fine, be very careful. I know the Sa3a builds this was a common step to have to do due to the way the boards were sensitive to the toroid. Another simpler option is to install a MU shield yourself, you don't have to rotate anything with that and do it with the unit off and unplugged.
|
|
|
Post by MorEQsThanAnswers on Jun 30, 2019 17:35:42 GMT -6
Does anyone have a recording so I can hear the buzz your experiencing? I would like to compare it to mine to see if my issue is this transformer issue. Bump. I’d really like some files too. I had noticed a potential issue, but chalked it up to user error. Thought it was my gain staging, but it would explain a lot if there was a common buzzing issue
|
|
|
Post by askomiko on Jun 30, 2019 22:38:57 GMT -6
|
|
|
Post by forgotteng on Jul 1, 2019 13:04:35 GMT -6
|
|
|
Post by phantom on Jul 1, 2019 16:32:33 GMT -6
All you that have this hum problem have received the unit before or after Joshua said he found the issue?
I have one coming soon, and really hope to not face this problem.
|
|
|
Post by Bender on Jul 2, 2019 11:11:01 GMT -6
The fact that so many have waited a year+ only for their gear to arrive with issues is mind boggling to me to say the least. Correct me if wrong, but same story with the ADG no, though some folks (john) opted to keep the "wrong" value resistor.
|
|
|
Post by christopher on Jul 2, 2019 11:25:08 GMT -6
It appears by all accounts these are made to last 50 years, so is a long wait and quirks on first issue pieces really that weird? (Haha. I don’t know how I get sucked into these threads. Fascinating company and products really)
|
|
|
Post by stam on Jul 2, 2019 12:52:48 GMT -6
The fact that so many have waited a year+ only for their gear to arrive with issues is mind boggling to me to say the least. Correct me if wrong, but same story with the ADG no, though some folks (john) opted to keep the "wrong" value resistor. There was no wrong value resistor on the ADG.
|
|
|
Post by stam on Jul 2, 2019 12:53:43 GMT -6
Anybody having hum email me please (stamaudio@gmail.com)
I have a quick fix for it
Thanks
|
|
|
Post by Johnkenn on Jul 2, 2019 17:09:05 GMT -6
The fact that so many have waited a year+ only for their gear to arrive with issues is mind boggling to me to say the least. Correct me if wrong, but same story with the ADG no, though some folks (john) opted to keep the "wrong" value resistor. “Wrong” value is kind of heavy handed. It was a decision. I changed back because I liked the Stam value a little better.
|
|
|
Post by Johnkenn on Jul 2, 2019 17:10:01 GMT -6
Anybody having hum email me please (stamaudio@gmail.com) I have a quick fix for it Thanks Is it the same as you sent to me? Just turning the transformer?
|
|
|
Post by Ward on Jul 4, 2019 6:31:54 GMT -6
Makes perfect sense, @moreqsthananswers
some of the 're-creators' are goosing a few things in the reproductions. Output being just one of those things. I don't like a hotter output, it overdrives the input stage of any compressor or outboard EQ following. Or the converter.
Nominal output would be nice, but reproducing the original spec would even be nicer.
|
|
|
Post by matt@IAA on Jul 4, 2019 9:20:00 GMT -6
I would be surprised if the original EQ wasn’t unity gain through. It might not be, I haven’t drawn out the gain staging in detail. But you would expect that engaging the EQ flat wouldn’t result in a level drop..
|
|
|
Post by christopher on Jul 4, 2019 9:57:59 GMT -6
I can see it making sense considering this is from the time of when tube stages were everywhere, so maybe a gain adjustment offered some cleaner headroom?
|
|
|
Post by matt@IAA on Jul 4, 2019 10:33:25 GMT -6
I can see it making sense considering this is from the time of when tube stages were everywhere, so maybe a gain adjustment offered some cleaner headroom? nah, this is an EQ that was an integral part of a console. Not a standalone module, and it’s between the preamp / line input amp and the output line amp in the signal flow. I don’t see why you’d have a level drop coming into the EQ
|
|
|
Post by stam on Jul 4, 2019 10:49:54 GMT -6
The original 1073 has a level drop in the schematic. I did not invent it. There is no such thing as the "stam" value Check the schematic of revision A, same value.
You guys want different things and that is fine, I don't mind changing the original a little if it makes it more enjoyable as longs as the THD, frequency response, tone and overall sound of the unit is the same as the original.
|
|
|
Post by matt@IAA on Jul 4, 2019 11:19:24 GMT -6
Looked at the block diagram. There is indeed a -4 dB drop across the EQ, from -14 to -18 nominal. Learn something new every day.
This is bugging me because I’ve worked on a neve 80xx desk before and for the life of me I dont remember it doing that. I asked my buddy who works on one full time and he says there’s no level drop engaging the EQ either.
|
|
|
Post by Johnkenn on Jul 4, 2019 14:54:29 GMT -6
The original 1073 has a level drop in the schematic. I did not invent it. There is no such thing as the "stam" value Check the schematic of revision A, same value. You guys want different things and that is fine, I don't mind changing the original a little if it makes it more enjoyable as longs as the THD, frequency response, tone and overall sound of the unit is the same as the original. Not sure why I typed Stam value...I knew the one you put in there was the original resistor.
|
|
|
Post by Johnkenn on Jul 4, 2019 14:56:19 GMT -6
Well, it’s not like you are switching between EQ in and EQ out during songs. If the gain staging is right, it’s right. But it’s a pretty easy fix that he can send if you want to do it
|
|
|
Post by mulmany on Jul 4, 2019 16:39:48 GMT -6
Looked at the block diagram. There is indeed a -4 dB drop across the EQ, from -14 to -18 nominal. Learn something new every day. This is bugging me because I’ve worked on a neve 80xx desk before and for the life of me I dont remember it doing that. I asked my buddy who works on one full time and he says there’s no level drop engaging the EQ either. Does the "in console" use fix the level drop?
|
|
|
Post by matt@IAA on Jul 4, 2019 19:03:54 GMT -6
mulmany I don’t think so, because it’s a level drop by the EQ circuit itself. It’s internal to the module. Anything fed by it would be affected- bus, direct out, whatever. I mean it’s possible I just never noticed. I’m not at home right now but now I kinda want to go look at the EQ circuit in detail. If I recall the low and high bands are passive, so I wonder if it just drops more than the makeup provides. I’d be really interested for a Neve smart type to explain the rationale for that.
|
|
|
Post by wiz on Jul 4, 2019 19:25:16 GMT -6
mulmany I don’t think so, because it’s a level drop by the EQ circuit itself. It’s internal to the module. Anything fed by it would be affected- bus, direct out, whatever. I mean it’s possible I just never noticed. I’m not at home right now but now I kinda want to go look at the EQ circuit in detail. If I recall the low and high bands are passive, so I wonder if it just drops more than the makeup provides. I’d be really interested for a Neve smart type to explain the rationale for that. is the level drop to provide added headroom? Also, when you engage the EQ the tolerance IIRC is +- 1dB, so you can have a frequency response change of 2dB cheers Wiz
|
|
|
Post by forgotteng on Jul 5, 2019 19:46:20 GMT -6
Josh has already been in contact with me and arranged for my unit to be checked out. As I expected him to react. Josh has always been good with responding to me.
|
|
|
Post by kilroyrock on Jul 6, 2019 8:29:04 GMT -6
My unit is coming back from the fix next week, looking forward to hearing it!
|
|