I got this lovely and versatile audio interface a couple years back, for some multitrack recording with my (former) band, and as a "foundation" for my (future?) home-studio.
A while back, i decided to "pop the hood" and check out the insides. The PSU made me cringe - C(r)apXon It puts out 5v for the digital/logic stuff, +/-15v for the analog stages, and 51v for the phantom-power. I haven't yet replaced the mains filter cap (since i figured it's not under THAT much strain, plus i don't have a suitably-sized one in stock... for now ).
Re-cap stage one:
- the 5v line received a 1200uF/10v Chemicon LXV before the inductor, and an 1800uF/6.3v KZJ after it. This is the rail where the feedback is taken from.
- the +/-15v rails got a pair of 470uF/35v Panasonic FR each
- i left the two 100uF/100v CapXon GS in place, since i didn't have such high-voltage caps (for now), and the phantom power isn't that power-hungry anyway
While i had the psu out, i decided to upgrade the switching FET and the 5v rectifier. FQPF8N60C got replaced by a 2SK2761, and i slipped in an STPS2045CT instead of the MBR10100CT.
Throughout the rest of the inside (ie. the main board), Jamicon SK (85c general purpose) as coupling and power filtering caps, and five Samxon GF 220u/50v on the 5v / 3.3v / +/-6.9v outputs. The +/-6.9v and the 48v phantom-power have LM317/337 voltage regulators on them, and they had SK's right at the output, then an inductor, and then the Samxons.
The attached pic is a "before" shot of the mainboard
A while back, i decided to "pop the hood" and check out the insides. The PSU made me cringe - C(r)apXon It puts out 5v for the digital/logic stuff, +/-15v for the analog stages, and 51v for the phantom-power. I haven't yet replaced the mains filter cap (since i figured it's not under THAT much strain, plus i don't have a suitably-sized one in stock... for now ).
Re-cap stage one:
- the 5v line received a 1200uF/10v Chemicon LXV before the inductor, and an 1800uF/6.3v KZJ after it. This is the rail where the feedback is taken from.
- the +/-15v rails got a pair of 470uF/35v Panasonic FR each
- i left the two 100uF/100v CapXon GS in place, since i didn't have such high-voltage caps (for now), and the phantom power isn't that power-hungry anyway
While i had the psu out, i decided to upgrade the switching FET and the 5v rectifier. FQPF8N60C got replaced by a 2SK2761, and i slipped in an STPS2045CT instead of the MBR10100CT.
Throughout the rest of the inside (ie. the main board), Jamicon SK (85c general purpose) as coupling and power filtering caps, and five Samxon GF 220u/50v on the 5v / 3.3v / +/-6.9v outputs. The +/-6.9v and the 48v phantom-power have LM317/337 voltage regulators on them, and they had SK's right at the output, then an inductor, and then the Samxons.
The attached pic is a "before" shot of the mainboard
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