I will check my Bench supply.
AT33PTG2. You were a big influence and every time I looked into it Audio Technica was well talked about and the icing on the cake came from a thread where a guy said it was the best sounding cart he had ever listened to from Denon's to the Art9. It was a long list and it was personal. YMMV. Insidentally, the seller does have one Art9 for $995 US if anybody you know has been looking. Short supply right now. Seller is Ebay in Japan.
It will be going with an SL-1200G. Don't want to shortcut the system I am working on.
Thanks for your help.
Don
@donhughes111—I tried to fire up the new boards (UBiB portion) with my bench supply which maxes out at 30VDC... saw what you did... brief lighting of the LEDs (yea! all oriented right!) then they went out...
Just now I pulled a couple of lines from my FSP power supply. It's putting out around 41+VDC. With enough juice, the UBiB portion of the new amp behaved as expected, I was able to dial in the 34VDC Salas spec-ed...Definitely get some heatsink action going for testing outside a case!
Just now I pulled a couple of lines from my FSP power supply. It's putting out around 41+VDC. With enough juice, the UBiB portion of the new amp behaved as expected, I was able to dial in the 34VDC Salas spec-ed...Definitely get some heatsink action going for testing outside a case!
Well... I was motivated to just test everything out in anticipation of chassis...first board 34v on UBiB no issue, plug in amp, 0v on TP...was able to dial a bunch and get 4v. Very steady too...even with everything exposed..
On second board also able to dial in 34v on UBiB... then on TP, 7v out of the gate and was only able to get it down to around 5v... had to drop UBiB to around 32v to achieve the 4v TP. Assuming this is all normal Salas? The 4v TP being the ultimate goal? Curious though as to why....? Not saying this is related, but I did match my LEDs just because....obviously I’ll recheck all points, especially since I think I’ll make another PSU...
On second board also able to dial in 34v on UBiB... then on TP, 7v out of the gate and was only able to get it down to around 5v... had to drop UBiB to around 32v to achieve the 4v TP. Assuming this is all normal Salas? The 4v TP being the ultimate goal? Curious though as to why....? Not saying this is related, but I did match my LEDs just because....obviously I’ll recheck all points, especially since I think I’ll make another PSU...
Yes because it means same correct bias current runs in both channels input stages load resistor (R4).
Hello Salas
What is the purpose of the three leds over J1 in the ultrabib v1.3 ?
I sure didn't see that one. That's how we learn.
Voltage drop to protect the lower max voltage PF5102 J1 than a K117 that used to be there in the previous.
That looks great and really affordable, I may abandon the Protocase idea. Any thoughts on how well the aluminum shields the UFSP at 62dB gain?
I am running mine at 43db with only a slight hiss at a very loud listening level. Par-metal sells the enclosure in a Gold/Clear alodine finish for EMI shield. I chose the unfinished version and am very happy with it. The line amp in the photo is a DCG3 in a Par-metal case.
