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Post by stam on Aug 27, 2019 15:19:42 GMT -6
I certainly hope he is, best ears in Chile imho You are certainly enthusiastic about certain brands as well lately He has a bunch of my stuff and I am very honored of that, not an easy man to please, you should give his work a listen (https://www.javierbassino.com/) |
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elcct
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Post by elcct on Aug 27, 2019 15:39:48 GMT -6
I am reading this in the manual:
"- Turn the Input and Threshold control all the way down (CCW). Inrush current upon power
up is very high, and it will definitely damage the control amplifier"
Is is the same with Fairchild? I was looking at the manual of the original 670 and another clone and there is no such warning.
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Post by kcatthedog on Aug 27, 2019 18:34:34 GMT -6
A guy on fb posted a pic clearly 007, so I guess Sean Connery is happy now with his Stam purchase ?  |
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Post by wiz on Aug 27, 2019 19:03:31 GMT -6
I am reading this in the manual: "- Turn the Input and Threshold control all the way down (CCW). Inrush current upon power up is very high, and it will definitely damage the control amplifier" Is is the same with Fairchild? I was looking at the manual of the original 670 and another clone and there is no such warning. I read this as well, and its a concern. I would like to see it fused in some way to counteract this. You just know its going to happen. I am going to hang a tag on the on off switch or something like it. Cheers Wiz |
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Post by adamjbrass on Aug 27, 2019 19:17:50 GMT -6
I am reading this in the manual: "- Turn the Input and Threshold control all the way down (CCW). Inrush current upon power up is very high, and it will definitely damage the control amplifier" Is is the same with Fairchild? I was looking at the manual of the original 670 and another clone and there is no such warning. This seems like a really gross flaw to me. |
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Post by thirdeye on Aug 27, 2019 22:52:51 GMT -6
I am reading this in the manual: "- Turn the Input and Threshold control all the way down (CCW). Inrush current upon power up is very high, and it will definitely damage the control amplifier" Is is the same with Fairchild? I was looking at the manual of the original 670 and another clone and there is no such warning. This seems like a really gross flaw to me. I agree. |
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Post by the other mark williams on Aug 27, 2019 23:03:26 GMT -6
Perhaps this is an argument for simply leaving it powered up at all times?
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Post by drumhead57 on Aug 27, 2019 23:05:36 GMT -6
I am reading this in the manual: "- Turn the Input and Threshold control all the way down (CCW). Inrush current upon power up is very high, and it will definitely damage the control amplifier" Is is the same with Fairchild? I was looking at the manual of the original 670 and another clone and there is no such warning. FWIW; there is no such warning of this kind within the UTA UnFairchild manual that I know of. After two years of use I've never turned the knobs CCW before power up/shut down and I've never had a problem. |
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Post by stam on Aug 28, 2019 0:10:13 GMT -6
I am reading this in the manual: "- Turn the Input and Threshold control all the way down (CCW). Inrush current upon power up is very high, and it will definitely damage the control amplifier" Is is the same with Fairchild? I was looking at the manual of the original 670 and another clone and there is no such warning. This seems like a really gross flaw to me. It's not. |
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Post by m03 on Aug 28, 2019 1:30:38 GMT -6
This seems like a really gross flaw to me. It's going to result in lots of broken units because most people are just going to start twiddling knobs and without ever reading the manual. Perhaps this is an argument for simply leaving it powered up at all times? If the plan is going to be to leave it powered on most of the time, then it seems like temporary power outages are going to damage the occasional unit in a home studio environment. |
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Post by kcatthedog on Aug 28, 2019 2:23:36 GMT -6
Wondering why a standby switch wasn’t added, like a guitar amp,no big deal ?
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Post by stam on Aug 28, 2019 2:28:11 GMT -6
This seems like a really gross flaw to me. It's going to result in lots of broken units because most people are just going to start twiddling knobs and without ever reading the manual. Perhaps this is an argument for simply leaving it powered up at all times? If the plan is going to be to leave it powered on most of the time, then it seems like temporary power outages are going to damage the occasional unit in a home studio environment. No unit will be broken. No need to leave it turned on. |
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Post by kcatthedog on Aug 28, 2019 2:39:37 GMT -6
So Josh,
just curious, with our modded delta boards and upgraded power supplies, wiz and I are well aware of insurge challenges.
how can insurge be something to be aware of but not a concern?
What in the circuit is absorbing/ controlling the insurge?
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Post by adamjbrass on Aug 28, 2019 4:18:00 GMT -6
This seems like a really gross flaw to me. It's going to result in lots of broken units because most people are just going to start twiddling knobs and without ever reading the manual. Perhaps this is an argument for simply leaving it powered up at all times? If the plan is going to be to leave it powered on most of the time, then it seems like temporary power outages are going to damage the occasional unit in a home studio environment. Other designers know how to deal with things like this. |
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Post by stam on Aug 28, 2019 4:55:07 GMT -6
It's going to result in lots of broken units because most people are just going to start twiddling knobs and without ever reading the manual. If the plan is going to be to leave it powered on most of the time, then it seems like temporary power outages are going to damage the occasional unit in a home studio environment. Other designers know how to deal with things like this. So do I |
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Post by stam on Aug 28, 2019 4:58:14 GMT -6
So Josh, just curious, with our modded delta boards and upgraded power supplies, wiz and I are well aware of insurge challenges. how can insurge be something to be aware of but not a concern? What in the circuit is absorbing/ controlling the insurge? I will get back to you in a bit This is something I was aware about and it's not going to be a problem Don't worry |
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elcct
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Post by elcct on Aug 28, 2019 5:14:48 GMT -6
It's going to result in lots of broken units because most people are just going to start twiddling knobs and without ever reading the manual. If the plan is going to be to leave it powered on most of the time, then it seems like temporary power outages are going to damage the occasional unit in a home studio environment. No unit will be broken. No need to leave it turned on. Would be great to know about how the damage could be avoided. Even if you always make sure to follow the procedure, the power cut could cause the unit to be turned back on with the knob in the wrong place or you simply that one day when coffee has not started working just forget about it and turn it on with the knob in the wrong place. I am sure some sort of a UPS that will not return the power after a cut could work to avoid turning the unit back on after the outage. Then I wonder if there is a risk if you turn the knob too fast? |
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Post by adamjbrass on Aug 28, 2019 5:55:44 GMT -6
Now I get why it’s called a StamChild...named after its maker
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Post by kcatthedog on Aug 28, 2019 6:21:22 GMT -6
Will be very interested in people's impressions of using this ! A very special recreation for sure !
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Post by Ward on Aug 28, 2019 6:39:42 GMT -6
You are certainly enthusiastic about certain brands as well lately Absolutely. I'm also very enthusiastic about my SA2a !! |
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Post by stam on Aug 28, 2019 7:09:14 GMT -6
The Fairchild uses a 5A mains fuse.
Such a high value was used only to stand the huge inrush current needed to feed all that cold filaments and charge the big caps, since back in the day s slow blow fuse was still not avaliable (I believe it was in the eighties)
The disadvantage if using a such big fuse is that any eventual subsequent malfunctioning will blow the circuit before the fuses shorts out.
We decided to use a smaller slow blow mains fuse to protect the inner circuit.
For further protection in the unfortunate case you forget this suggestion of turning down the knobs a soft start circuit in the control amplifier and NTC's surge protection has already been implemented on all units, in other words, you can power on the unit with the knobs anywhere and it won’t damage the control amplifier
The manual was made before I made this changed thus is outdated and you have nothing to worry about, I will be editing the manual this week
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Post by stam on Aug 28, 2019 7:09:35 GMT -6
Now I get why it’s called a StamChild...named after its maker Thank you for the recognition Adam, means a lot |
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Post by adamjbrass on Aug 28, 2019 7:13:25 GMT -6
Now I get why it’s called a StamChild...named after its maker Thank you for the recognition Adam, means a lot So, it seems like it only took you three posts to explain it. Maybe the time it took to google how to do it. I don't trust anything you say..sorry |
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Post by stam on Aug 28, 2019 7:16:06 GMT -6
Joshua, is the D.C. Threshold omitted in this clone? I can't find anything about it in the manual. Basically it sets the compression ratio on the original I think? the DC threshold trimmers are inside the units. The unit is factory calibrated according to original Fairchild graphs in the manual |
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Post by stam on Aug 28, 2019 7:17:06 GMT -6
Thank you for the recognition Adam, means a lot So, it seems like it only took you three posts to explain it. Maybe the time it took to google how to do it. I don't trust anything you say..sorry So google also manufactured the soft start pcb and added it to the unit? Wow. Go google ! |
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