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  1. Replies
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    This surely intended as a joke, DIY not such a...

    This surely intended as a joke, DIY not such a flakey forum, a lot of well known engineers there and advanced experimenters.
    That being said, mic and balanced like cables are often directional and...
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    5,228

    Schematic for the Allen and Heath ZED R16 or 16fx

    Which console, the ZED R16 or 16fx? They are different in many ways
  3. Replies
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    3,855

    Adding the cap is a good idea on a system where...

    Adding the cap is a good idea on a system where the LF voltage swing is as high as on a bass amp. Piezo tweeters are cool devices but you do not want to bias them with a high voltage, with the lower...
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    Can you capture it in a photo and post? The wave...

    Can you capture it in a photo and post? The wave form when it is happening will tell a lot. Does it crackle only with bass control change or is it volume change? If you monitor the grid of that tube...
  5. What distance from the sound source and what...

    What distance from the sound source and what level is the source? The preamplifiers have around 60 db of gain which is a lot unless using low output mics, mismatched impedance or too far from the...
  6. That would lower signal to noise ratio to worst...

    That would lower signal to noise ratio to worst than Behringer level. The key for pro console signal chain is each stage operated at its optimum DR and gain in series.
    The front end is using the...
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    33,841

    Sticky: I noticed the same thing with Mint. It is a slick...

    I noticed the same thing with Mint. It is a slick polished package but has grown so it needs more resources. I need to set up another simple reliable office machine and the only stumbling block is no...
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    2,071

    I have schematics for many models but not a ZED...

    I have schematics for many models but not a ZED FX series, lots of ZED's however.
    So you have checked routing so all aux sends, send and all CR monitor output is OK. What about the Mono main buss...
  9. There is a bias pot but as in any good design it...

    There is a bias pot but as in any good design it has limited adjustment range.
    How much of the wave form is missing? Does the notch occur as a dead band in the exact center of a test signal...
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    Whatever meter you end up with, invest in some...

    Whatever meter you end up with, invest in some good test leads. Silicone rubber is a good choice for durability, safety, burn resistance and flexibility. I have a Fluke 8050 bench meter with original...
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    What budget and what other test gear do you have?...

    What budget and what other test gear do you have? For example if you have a good scope, spending more on a meter is wise. If you don't have a scope get a cheap Chinese meter and put the money you...
  12. Thread: Obsolete op amp?

    by km6xz
    Replies
    23
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    2,966

    Agree, supply problem at the chip means it can't...

    Agree, supply problem at the chip means it can't work. The pin 4 problem needs to be traced back to the power supply portion. You have been given good advice to check the resistance, with the power...
  13. Thread: Obsolete op amp?

    by km6xz
    Replies
    23
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    2,966

    ANY electronics parts house will have it, the...

    ANY electronics parts house will have it, the most common general purpose dual op amp available. Agree, check the voltage on each pin and list it here by pin number. Pin 1 is the one with the dot. ...
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    4,007

    I don't buy JJ because one of the most popular...

    I don't buy JJ because one of the most popular manufacturers here, Yerasov, uses JJ tubes and at least once a month, a brand new amp comes defective out of the new box. For 6 years it has been...
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    The line "industry standard guitar playing" sort...

    The line "industry standard guitar playing" sort of says it all.
    I always advise beginners who just starting to get bookings and a rep to avoid modeling amps and heavy digital effect because it...
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    865

    When you say you get signal through it, you are...

    When you say you get signal through it, you are talking about dry signal but no recovery from the head at all?
    I would not bother with voltage measurements yet, but signal path. Isolate whether the...
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    1,178

    Has it ever worked? The values indicate it is...

    Has it ever worked? The values indicate it is miswired. The screen supply is shorted to ground
  18. Replies
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    "No ohms" means what? Zero ohms or no reading,...

    "No ohms" means what? Zero ohms or no reading, due to being open? But that reading does not cause very low voltage seen on the plate, if the cathode was open the voltage would be higher on the plate...
  19. I just ran into the need to verify a contact...

    I just ran into the need to verify a contact pickup mounted in a ukulele. The acoustic instrument amp was suspected of being the problem by the customer. She had taken it to 3 different techs and...
  20. Thread: Alesis thingie

    by km6xz
    Replies
    5
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    795

    Sure does not sound like a custom made. The...

    Sure does not sound like a custom made. The company did not spend much money on sales tools but maybe that was one that was offered to stores for a price most did not care to bother with so was very...
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    Do you have a current regulated bipolar bench...

    Do you have a current regulated bipolar bench supply to run the board. I had one a few months ago with low voltage and it was a head scratcher until I concluded it was a cracked core of the...
  22. Thread: crown xls2500

    by km6xz
    Replies
    3
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    930

    Agree with Enzo, unless the positive rail switch...

    Agree with Enzo, unless the positive rail switch is Q103 is shorted, it is going to be a dynamic problem in that the output is being told to turn on that transistor. But why? It is a very complex amp...
  23. Thread: Alesis thingie

    by km6xz
    Replies
    5
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    795

    Hummm, We were their biggest warranty station and...

    Hummm, We were their biggest warranty station and in fact took over all factory service the last 2 years the original company existed, and never heard of it. Have you seen others or was it a one-off...
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    Don't read voltages. It is broken, don't put...

    Don't read voltages. It is broken, don't put power to it until you discover what is the problem. Your own meter will tell you a lot, enough to identify the problem. Keep it unplugged until you...
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    Pull the rectifier and measure the resistance...

    Pull the rectifier and measure the resistance from that filter cap to ground. You should see a moderate resistance that steadily increase with time until it is very high. The Rectifier is probably...
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    Transformers are easy to find in any open market...

    Transformers are easy to find in any open market in Turkey, they will be cheaper there then buying in the US. In the US it is assumed it is for a traveler and marketed as for the travel industries...
  27. Without a reference in voltage gain, your test...

    Without a reference in voltage gain, your test reveals nothing about the inherent noise contribution made by the tube. If one tube is a lot higher mu than another you would expect a lot more noise...
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    1,660

    It is called the Model "Rythym 2" and is a...

    It is called the Model "Rythym 2" and is a teaching synth. The power supply is critical, verify the output is what it is supposed to be or nothing is going to work properly. The parts are pretty...
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