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Circuits & Concepts

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Circuits & Concepts last won the day on December 16 2017

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About Circuits & Concepts

  • Rank
    TO-18 Transistor

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  • Gender
    Male
  • Location
    santa barbara
  • RealName
    Les Wolff
  • Occupation
    Electrical Engineer

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  1. Happy Birthday, Kevin! Hope it's a good one! Les
  2. Yep. When the trim capacitor oxidizes, it can go open. That makes the PLL IC lose its mind. Time for a fresh trim cap! Les
  3. Welcome, Matt! I suggest you get the power supply sorted out before doing anything else. I typically probe the rectifier diodes to do this. Red meter lead on the diode of interest and the black lead on the chassis. Measure and log both the DC and AC voltages. The AC voltage (on the rectified side of the diode) should be lower than 0.1 VAC. Something higher indicates a bad power supply capacitor, which will mess up the regulation. The kit you ordered from C & C includes the resistor R635, new speaker relays and a trim cap for the tuner. T
  4. Welcome to the site, Brian! Hearing from Tooele takes me way back... years ago I worked at the Hercules rocket plant in WVC. Cheers! Les
  5. Grandpa The Gambler The IRS decides to audit Grandpa, and summons him to the IRS office. The auditor was not surprised when Grandpa showed up with his attorney.... The auditor said, "Well, sir, you have an extravagant lifestyle and no full-time employment, which you explain by saying that you win money gambling. I'm not sure the IRS finds that believable." "I'm a great gambler, and I can prove it," says Grandpa. "How about a demonstration?" The auditor thinks for a moment and said, "Okay. Go ahead." Grandpa says, "I'll bet you a thousand dollars that I can bite my own
  6. Congratulations on the move, Mark! I spent a few years in SLC attending the University of Utah. It's a great place--especially if you enjoy the mountains.
  7. A man was leaving a convenience store with his espresso when he noticed a most unusual Italian funeral procession approaching the nearby cemetery. A black hearse was followed by a second black hearse about 50 feet behind the first one. Behind the second hearse was a solitary Italian man walking a dog on a leash. Behind him, a short distance back, were about 200 men walking in single file. The man couldn't stand the curiosity. He respectfully approached the Italian man walking the dog and said: "I am so sorry for your loss, and this may be a bad time to disturb
  8. Hello, and welcome to the site! You said that you measured the supply voltages per the photo I posted in the other thread. Could you share both the DC and AC measurements? These measurements are taken at the rectifier diodes because they are the most convenient point at which to probe. Thanks! Les
  9. Thanks to Steve for stepping into the job. Thanks also to Snow for all the work you did!!! Cheers! Les
  10. I'm curious about the Carver logo. Is there a copyright or trade mark on it? Or, is it washed clean and part of the public domain? Les
  11. In the early 80's, I was working for an R&D group of GM. They were interested in the multipath reduction system in the Carver TX-11A. I spent a few months testing and reverse-engineering the circuit. I know the TX-11A inside and out! We found an interesting design feature in the circuit. The multipath reduction circuit was actually a blend to mono, then added a phase delay between the channels to synthesize a stereo effect. Trouble with this is that when a reviewer did a channel separation test, it would measure zero channel separation. Carver responded by adding a circuit th
  12. Thanks, guys! Truly an honor. I guess I need to go out and pick up a couple more amps ....!!! Les
  13. Hello Dancer Did you recap the M-1.5 yourself, or did you go to a shop to instal? Cheers! Les
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