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What is the real name of this part?

Discussion in 'General Electronics Discussion' started by Craig, Jan 24, 2017.

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  1. Craig

    Craig

    9
    0
    Apr 10, 2014
    Okay guys I know this is a .01uF capacitor. My problem is I'm trying to order from Mouser but cannot find the right part because I don't know how to search it. Is there an "official name" for it. Here is a photo and a schematic if your wondering. It is part of a circuit in a Fender FR212 100 watt guitar amplifier. C49 and C50 caps are circled on the sch 0123172247.jpg 0123172248.jpg 0123172255.jpg ematic. Thanks for any info!
     
  2. davenn

    davenn Moderator

    13,808
    1,943
    Sep 5, 2009
    They are MKT polyester caps


    I don't see any obvious fault with them, why do you want to replace them ??
    highly unlikely that there is anything wrong with them, they are a reliable type
     
  3. shrtrnd

    shrtrnd

    3,814
    516
    Jan 15, 2010
    davenn's got a good point. I'd be more concerned about he TL072 Op Amp (which is also pretty cheap), than the
    caps themselves. What is your fault? What is the problem you're seeing?
    The best way to try to search for caps, is to try to get a print copy, or actually access the vendor's catalog on-line,
    and look for the cap by (1) Type (2) Voltage Rating (3) capacitance.
    I HATE those screwy search engines where you try to enter values and let the computer try to filter that information
    to suggest options. They never work right as far as I'm concerned.
     
    Craig and davenn like this.
  4. Craig

    Craig

    9
    0
    Apr 10, 2014
    I am posting a pic of the outputs on pin 1 and 7 of the Op Amp TLO 72 any idea what's going on?
     

    Attached Files:

  5. Audioguru

    Audioguru

    3,238
    702
    Sep 24, 2016
    D16 and D17 are producing clipping because the input signal level is too high. Turn down the input level to prevent the clipping. The schematic shows 33 milli-volts (0.033V) but the output of the opamps are much higher.
     
  6. Craig

    Craig

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    0
    Apr 10, 2014
    Ok, this is a guitar amplifier and the schematic says use a 5mVac 1khz test tone at the inputs to the amp. The final output at the speaker should be 2.05VAC. So I will check my test conditions and see what happens. That is a new TLO 72 so it shouldn't be the OP. Thanks so much.
     
  7. Craig

    Craig

    9
    0
    Apr 10, 2014
    Ok so this amp is driving me crazy. Seems when i go test it agin I sometimes get different out wave on the scope.I will post pics of the inputs and outputs (today) of the TLO 82, and here are also the voltages.
    Input at the jack to amp.
    Ac sine wave at 1khz, 5.18 mv VAC
    U6A
    Pin1- 6.03mv VAC
    Pin 2- 5.98mv VAC
    Pin 3- 15.08mv VAC
    Pin 4- (-) 16.49VDC
    U6B
    Pin 5- 6.07mv VAC
    Pin 6- 6.05mv VAC
    Pin 7- 69mv VAC
    Pin 8- (+) 16.38VDC
    As you can see I have a different conditions today and different waveforms. The OP amp before it is operating perfect. I don't what to do with this POS. lol 0131172114.jpg 0131172114a.jpg 0131172115.jpg 0131172115a.jpg 0131172116.jpg 0131172116a.jpg
     
  8. Audioguru

    Audioguru

    3,238
    702
    Sep 24, 2016
    The severe distortion looks normal for a vacuum tube geetar amplifier. A transistor with no negative feedback also produces severe distortion like that.
     

    Attached Files:

  9. Craig

    Craig

    9
    0
    Apr 10, 2014
    Problem is I'm running the sine wave thru the clean channel. It should be a very clean match to the input.
     
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