• Sola Sound BUM Fuzz update

  • This cheap ass version came with BC549C transistors known as one of the common high-gain transistors. The original B&M fuzz seemed to come with BC184C silicon transistors. and, I believe there were few different transistors Sola Sound tried at 70’s for the original B&M fuzz.

    I replaced the components one by one to see the difference one by one. Omeg pots and 470pf caps made a improvement while NOS 0.1uf Mullard trpical fish didn’t bring a noticeable difference.

    Most of the resistors are staying on the circuit board except for 3 of them. cheap ass version came with 3 different resistors than the normal and expensive BUM fuzz. you’ll need each of 100 ohm, 100K, and 33K resistors to revert this circuit to 70’s style. (or expensive version of BUM fuzz). 100 ohm resistor can be replaced with 220 ohm or 0 ohm as well. I’ll check the resistors and update later.

    ZTX109 brought a tonal difference anyway. this bum fuzz sounds a bit older and bit alive than the original state with BC549C

     

     

    0 on March 19, 2019

    finally went to OC139 germanium transistors

    Sola Sound Bum fuzz with NPN OC139 Germanium transistors work great

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  • Pignose 7-100 from 70’s with Germanium transistors

  • Grabbed this Pignose 7-100 off reverb.com recently. the seller believed it didn’t work while I believed I could fix it. the price was really good for the reason.

    It was a luck. this little thing works fine without any issue. I see 4 Germanium transistors on the circuit board and expected a different sound than the current product. but it sounds pretty much close to the new ones.

     

     

    According to the schematic I got  from https://music-electronics-forum.com/showthread.php?t=8790 , it has 4 transistors. 

    Two of the germanium transistors (in the black housings) are sitting around the black hood which covers transformers. they seem to be 2SB324H. and I barely see 2SB172A and 2SB175B on the circuit board.

     

    7 on April 29, 2019

    Great Reverb score! I’ve been repairing some Pignoses lately and really enjoy playing them with a little delay pedal. I’ve got a ’72 model with the germanium transistors and would really like to see the actual placement order on the board…for the red, yellow, blue leads of the 2B324’s. I assume that they’re somewhat “switched” (in order) on either side of the black “heatsink”?

    Attached pic shows how mine are now.

    11 hours ago

    @congafish the reverb.com buyer has replied. unfortunately, he didn’t like the sound of germanium and sold his pignose already

    on May 1, 2019

    didn’t see that huge one on the right side till now. actually most of them except for the karate kid’s pignose. 

    on April 30, 2019
    I still barely understand the electric circuit.From 59burst

     

    Same here, but I’m learning. Thanks for the link. I’ve a few other early solid-state amps that I’m working on, so I can take “breaks” from the Pignose when frustrated / stymied.

     

    on April 30, 2019

    sounds like a challenge to me. I still barely understand the electric circuit. I’ve read about vintage germanium transistors which can be used for NPN and PNP both, probably on a fuzz forum.

    the only experience with germanium transistors was this project, btw

    https://slowbean.net/search-threads/oc139

     

    on April 29, 2019

    @dragonash: kinda fun to “dasiy chain” two together, using one as a preamp, out into a 2nd one. But yes, they’re certainly much better-sounding with a simple delay pedal. Haven’t tried the A-B route… yet.

    @59burst: Thanks. Think I figured the sequence out. (Emitter-Base-Collector / left to right? May try C-B-E?) Very low volume and hiss/hum/crackle before… but now mostly just low volume. Previously, 1 transistor & the 1Ω resistor were getting smokin’ hot. Now, no more high temps… but still no volume increase. The saga continues.

    *Replaced the 2 (A&B in pic) germanium transistors & the resistor “C”.

    on April 29, 2019

    a friend loves to play 2 of pignose amps through an ab box. i don’t know how they are old but i can tell they sound really good. i was about to get me an ab box then just realized i could do that with a delay pedal. 

    on April 29, 2019

    unfortunately, I’ve sold mine to  buy some vintage capacitors months ago. I put it back on Reverb.com and a german guy took it off. I’m not sure if he’d reply back but I’ll ask him to take some pictures of the leads

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  • 70’s Morley Volume Boost VBO with optical sensor

  • This volume boost pedal has optical resistor instead of potentiometer. the pot on the side is for boost not the volume control.

    the black taps are screening the light to the optical sensor. you can see how it works from this video.

    0 on March 18, 2019

    noticed they call the sensor LDR, light-dependent resistor. and this page shows how it works with the company history

    Class or Ass: Tel-Ray Morley VOL volume pedal

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    3 on March 13, 2019

    on March 13, 2019

    on March 13, 2019

    on March 13, 2019

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    1 on March 12, 2019

    Ever checked out their gear & accessories community: https://www.ultimate-guitar.com/forum/forumdisplay.php

    on March 12, 2019

    my favorite place is https://www.thegearpage.net

     

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    0 on March 12, 2019

    found a sound sample here

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  • ko Inside of JMI Tone Bender III reissue

  • 몇주 전에 소리를 들어보고는 마음에 들어서 빌려왔습니다. 가지고 놀면서 찾아보니 BPC 에서 만든 것도 보이던데, 이건 JMI 입니다. 60년대 톤벤던 III는 Sola Sound가 만들어서 Vox 상표로 팔린 것 같습니다. 같은 이름과 회로, 비슷한 것들이 엄청나게 많다는 정도만 알고 있습니다.

    퍼즈는 이것저것 주위에서 쓰니까 접할 기회가 많습니다. 게르마늄 퍼즈도 기타처럼 같은 모델이라고 해도 하나하나 다 다르게 느껴집니다.

    리이슈라서 요즘 PCB입니다. 풋스위치 배선을 보니 트루바이패스네요. 예전 영국산 페달들은 Arrow & Hart 풋스위치를 썼는데, 요즘은 대부분 미국회사인 Carling 스위치를 쓰네요. 어짜피 둘다 이제는 멕시코에서 만드니 품질은 같을겁니다.

    멀라드 OC75 세개가 들어있습니다. 이 퍼즈 소리가 마음에 들어서 비슷하게 개조하려고 Bum Fuzz를 구했습니다. 세세하게는 다르지만 전체적으로는 비슷합니다. Bum Fuzz는 B&M fuzz의 복각이고 Jumbo Tone Bender 회로라서 그냥 대충 봐도 저항과 캐퍼시터가 두배쯤 더 많고, 얘는 상대적으로 단순합니다.

    OC75는 유리관에 들어있는 게르마늄트랜지스터로 0.125W 저출력입니다. 60년대 게르마늄 트랜지스터는 용도에 따라 동작주파수가 다른데 얘는 0.1MHz로 동작합니다. 이 정도면 원래 오디오 신호용이 맞는 것 같습니다.

    Youtube에서 샘플을 하나 찾았습니다.

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