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jsts

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About jsts

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  • Location
    Berlin, Germany
  • Gender
    Male

Converted

  • Headphones
    Stax 007MK2
  • Headphone Amps
    Stax SRM-600
  • Sources
    Chord Hugo 2

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  1. Finished the experiment. First put a Panasonic EEUFS1C512L 16V/5100μF capacitor. It also warms up, about 55C. That is, the increase in voltage rating has not changed the situation. Then I put a Panasonic EEUFS1A752L 10V/7500μF. It is warmed up, but less, about 49C. That is, a 60% increase in capacitance rating led to a 10% decrease in temperature. Left 10V/7500μF, can no longer improve, 20000μF nowhere to place.
  2. I'm still alive 🙂 and finally I found an oscilloscope. Up-to-date tube power supply circuit: I'm looking at a 4700µf/10V capacitor (where I previously measured 6.83 volts with a multimeter): The total pulsation is about 2 volts. Voltage (real) is 7.62 volts. I look at the leads to the tubes (where I previously measured 6.15 volts with a multimeter): That's 6.33 volts, all right. I draw a conclusion that the capacitor 4700µf/10V heating is a working design and so conceived by the manufacturer. I will try to replace it on Panasonic EEUF
  3. Up-to-date tube power supply circuit (around voltage regulator):
  4. Addendum: Today (sunday evening), the power outlet has a 240VАС. I've again measured all voltages: - measured first blue to black (transformer) = 6.43VAC - measured second blue to black (transformer) = 6.43VAC - measured blue to blue = 12.86VAC - measured on the capacitor 4700uF/10V = 6.83VDC - measured at the tube filaments after the regulators = 6.15VDC That is, the diodes give stable 6.8VDC to 6.83VDC, and voltage regulators give stable 6.14 to 6.15VDC. That seems to be the design.
  5. Clarifications: - It turns out that all the wings in the transformer are connected. Thus, it works at 240V. - The voltage in the power outlet is 230±5V (the input voltage fluctuates within 2-3%). - there is no AC-voltage on the tubes. Up-to-date tube power supply circuit: I can rewire the power supply to 220V.
  6. I've measured all voltages: - measured blue to blue = 12.3VAC - measured on the capacitor 4700uF/10V = 6.8VDC - measured at the tube filaments after the regulators = 6.15VDC - measured everything referenced to black -347V Two diodes is 8B 21DQ04. I dropped them off and checked them out. They are guaranteed to work (they pass in one direction and infinity in the other). Circuit: All that remains is to return the old capacitor and see if it will warm up. If so, that's his normal state.
  7. That' s great information. I'll double-check everything. Thank you. Hello, spritzer! 🙂 My SRM-600 is 10 years old and many forum members recommend changing all capacitors after 10 years of amplifier operation. Well, I have replaced...
  8. No, no. My English isn't very good and I must have misspelled it. Sorry. How do I completely remove this attachment?
  9. Mr. Gilmore, thank you for your attendance, it is very important to me. It seemed to me that Head Case has more DIY-ers and to check with other owners if the capacitor warms up, there are more chances. Then I'll go over the circuit again and try to understand the exact difference between the original capacitors and the replaced ones. Thank you so much, I didn't think about it. I will try to be more careful and if I survive, I will continue to write about my adventures in the STAX world :). I just listened to music for 10 years and was not interested in anything else. A
  10. Good day, Admins! Unfortunately, something has gone wrong and I can't manage my attachments. There are simply no controls. Am I doing something wrong?
  11. Folks, I replaced all the electrolytic capacitors in my SRM-600. I can't say for sure if this has happened before, but this (photo) capacitor at 10V 4700uF is heating up. Not very much, around 55C. The headphones aren't plugged in. Can you tell me if this capacitor is in normal operation? Does it have to warm up? My SRM-600 for 230V voltage. First, I supplied a cheap Jamicon TKR472M1AJ26 capacitor. It was heating up.Then I decided to place EEUFR1A472L Panasonic Low ESR capacitor. However, it's warming up, too. I checked the diodes next to it - they're not broke. O
  12. Thank to spritzer, he contacted the administrators and now I'm with you
  13. Good afternoon! The thing is that when trying to register on the forum, the error "This site key is not enabled for the invisible captcha" appears. It is impossible to pass the registration. Can I ask to fix it somehow? Thank! Jsts.
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