
famous beagle
Well-known member
This is also pertaining to the mod in my earlier post, but this isn't a simple matter of a lifted trace.
There seems to be some contradictory information in the directions, and I'm wondering if anyone (with much more knowledge than me) can help me out. This is a mod for the ART Tube MP by Black Lion Audio. It's quite old (from 2004), and though I've contacted them about it, I'm doubtful I'll receive an answer.
I’ve attached a PDF to illustrate my question. It relates to what is done to pins 1 and 2 of U1. Here it is:
At the bottom of page 1 on the attached PDF (Note: this isn’t the original page 1 of the mod; I just extracted the relevant pages), it seems to say that the same procedure is performed for both U1 and U2. In other words, the 1k resistor and 2pf capacitor are soldered together and then soldered to pins 1 and 2. (See text encased in red rectangle. The text referring to U1 is in the green oval.)
But then in the list of directions that follow (“Here’s what needs to be done, in order:”), it seems to suggest something different. Here, it says to solder the 1k-2pf RC network to pins 1 and 2 of U2. But then it says to only solder a 1k resistor to pins 1 and 2 of U1. (Again, this is in a green oval.)
Also, the picture on page 3 of the PDF only shows a 1k resistor attached to pins 1 and 2 of U1.
So I’m confused. Am I misunderstanding something? Which is correct? It seems to say two different things, yes?
U1 and U2 are both LM6172 chips.
Thanks for any help
There seems to be some contradictory information in the directions, and I'm wondering if anyone (with much more knowledge than me) can help me out. This is a mod for the ART Tube MP by Black Lion Audio. It's quite old (from 2004), and though I've contacted them about it, I'm doubtful I'll receive an answer.
I’ve attached a PDF to illustrate my question. It relates to what is done to pins 1 and 2 of U1. Here it is:
At the bottom of page 1 on the attached PDF (Note: this isn’t the original page 1 of the mod; I just extracted the relevant pages), it seems to say that the same procedure is performed for both U1 and U2. In other words, the 1k resistor and 2pf capacitor are soldered together and then soldered to pins 1 and 2. (See text encased in red rectangle. The text referring to U1 is in the green oval.)
But then in the list of directions that follow (“Here’s what needs to be done, in order:”), it seems to suggest something different. Here, it says to solder the 1k-2pf RC network to pins 1 and 2 of U2. But then it says to only solder a 1k resistor to pins 1 and 2 of U1. (Again, this is in a green oval.)
Also, the picture on page 3 of the PDF only shows a 1k resistor attached to pins 1 and 2 of U1.
So I’m confused. Am I misunderstanding something? Which is correct? It seems to say two different things, yes?
U1 and U2 are both LM6172 chips.
Thanks for any help