Forum Replies Created

Viewing 8 posts - 16 through 23 (of 23 total)
1 2
  • Author
    Posts
  • February 3, 2020 at 10:34 pm in reply to: 1970’s MUFF FUZZ TRANSISTORS #125793
    Paulh
    Participant

    General Guitar Gadgets website has the transistor version schematic. It does not show a dpdt switch. But the circuit is much the same as my small box muff fuzz EXCEPT for the polarity. Npn transistors are BC239. I would not duplicate it because of the positive ground unless if that is what you want. I have not found the circuit of my muff fuzz on the web, but I have drawn it.

    January 31, 2020 at 4:43 pm in reply to: 1970’s MUFF FUZZ TRANSISTORS #125788
    Paulh
    Participant

    Paul here again:
    Well looking for clues on Muff Fuzz circuits I noticed that what I thought was a 27K resistor on paper is actually a 2point7K resistor (2K7). In the original 1978 Muff Fuzz enclosure resides a 27K resistor and that 10K resistor (that I changed). Yup Red Purple ORANGE (and I measured it out of circuit). So I am wondering if a mistake was made during the original assembly way back in 1978. Should be Red Purple RED. Went back to the breadboard and changed out the 27K and 68K (fix) with a 2K7 and 10K……..FUZZ (instead of just some gain which was the original problem).
    Mystery solved. Anyway the original Muff Fuzzes with that 27K and 68K (fix) so I am happy.
    It is still positive ground with BC239 transistors and sounds good. Just can’t plug it into another neg grnd box.
    Regards
    Paul

    September 14, 2016 at 12:57 pm in reply to: 1970’s MUFF FUZZ TRANSISTORS #122026
    Paulh
    Participant

    Ok, will try. Will post latter (3 wks) the results / questions.
    Thanks again for the tips…

    Paul

    September 10, 2016 at 9:25 pm in reply to: 1970’s MUFF FUZZ TRANSISTORS #122010
    Paulh
    Participant

    I printed out the debugging instructions. Shows how to make an audio probe that plugs into an amp.
    Question: Is the 9v battery installed in the effect when doing the probing ?
    Question: Could an audio probe be made with a 1.5v buzzer, 1.5v battery, 0.10uf cap and ground clip (no amp used) ?
    Would it do the same job ?

    (I have the parts to do either method but was just wondering…)

    Regards

    Paul

    September 6, 2016 at 3:28 pm in reply to: 1970’s MUFF FUZZ TRANSISTORS #121989
    Paulh
    Participant

    Scruffie:

    Thank you very much for the electronic lessons.
    Switch tests out OK using the ohm method.
    With the unit plugged in, switch in the Fuzz setting, still no fuzz even if I use a screw driver and go across the lugs, in essence making sure it is “switched”.
    I do have a 1.5-3.0 volt mini buzzer (new in package), 9 volt battery “holder” and set of resistors.

    Regards

    Paul

    August 26, 2016 at 11:31 pm in reply to: 1970’s MUFF FUZZ TRANSISTORS #121905
    Paulh
    Participant

    I took pictures of it before I did anything. So yes the bat is connected correct. My meter does not have continuity. See my point to point earlier post with pics.

    T2 emitter is connected to bat negative and electro cap neg plus 2 resistors.

    http://www.thegearpage.net/board/index.php?threads/69-electro-harmonix-muff-fuzz-eh-2008-plug-in.1333519/

    Picture shows guts simular. BUT not really near exact.
    note the bat pos connected to the pot can just like mine.
    Looking at muff fuzz circuits on the net,l see e connected to ground in all but one, little muff pi.
    I have not found a circuit exact as mine. Neither e on my circuit connects directly to ground without going thru a resistor or the electro cap.

    August 26, 2016 at 8:25 pm in reply to: 1970’s MUFF FUZZ TRANSISTORS #121903
    Paulh
    Participant

    Here are the readings with 9v battery installed.

    Transistor 1 (nearest the output (amp)) Com cable in screw hole

    C = -0.49
    B = -7.83
    E = -8.38

    Transistor 2

    C = -7.83
    B = -9.06
    E = -9.64

    Base of T1 is connected to Collector of T2.

    Thanks again

    Paul

    August 22, 2016 at 6:29 pm in reply to: 1970’s MUFF FUZZ POINT TO POINT CIRCUIT #121880
    Paulh
    Participant

    Thank you for the reply.
    I bought the Muff Fuzz in a small shop in Saulte Ste Marie Michigan.
    Also purchased a Small Stone Phase Shifter sometime around that era.
    It to is in excellent condition. I tried to glue a “stick” to the knob so as to turn it with my foot.
    Did not work, the only blemish is on the knob.

  • Author
    Posts
Viewing 8 posts - 16 through 23 (of 23 total)
1 2