Intact Audio

Guys, I'm working on a power supply mod for my SS SUMO power amplifier (Ulysses 2). I'd like to add a bit of filtering to quiet down rectifier diode switching noise. Couple changes: 1. RC (10 Ohms and 0.1uF) across each rectifier diode. 2. Add LC filer in series w each power rail. Filter could consi...

To reVintage: I'd like to clarify plate RIAA EQ calculations. Are the following equations correct: 3183uS time constant = R2 * (C8 + C9) = approx 3.09mS 318uS time constant = R8 * C8 = approx 320.33uS 3.18uS time constant = R11 * C9 = approx 3.15uS I'm missing following: 75uS time constant = ? Let m...

screen regulation... i was wondering about for a while. Is there an optimal screen voltage or voltage range? What about noise on regulated screen. It may be important in phono stage application. This is a first stage after all. Not sure how much noise we'd get from high voltage active regulator vs p...

Here is the emulation I did. It shows response is down about 2dB at 20kHz and fall fast after that.

OK, to sbench: 1. What exactly simulation shows? Is top end rolled of some? How much? 2. Could you elaborate on ratio between DC/AC loads comment? Most common cathode tube stages have lower DC load (Rp) and higher AC load. At least, that's my understanding. Do they have to be same and why? This is n...

Schematic is attached

Guys, Friend of mine built a phono with C3G pentode in first stage. Classic pentode circuit with passive EQ. It sounds very veiled and not clear. So, my question is this a generic sounds of pentodes (veiled / muffled and unclear) or we have some other issue? I'm trying to figure out whether we have ...

Hi, I'm looking for a MC Cartridge Demagnetizer schematic? Do you have one ? Could you e-mail it me or post it here. I could probably design one myself. But I'm not exactly sure how cartridge is demagnetized and what type of signal is feed to the cartridge and what level? I'd assume it's some type o...

Hi guys, I would like to discuss how to relate circuit design and components selection to the phono amplifier sound quality. Lets start with this: Would you agree that a high quiescent current topology sounds slower than a low current similar topology? I do not have a lot of experience with this but...