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    내부순환로 국민대학교 앞 정릉램프를 고가도로로 인식하는 네이게이션 앱

    내부 순환로를 자주 이용합니다. 성산대교 방면으로 진행하면 국민대학교 출입 램프가 정릉 터널 몇백 미터 전에 나옵니다. 이 출입램프를 도로로 이용하는 운전자들 때문에 위험한 상황이 종종 생깁니다.

    지도 링크합니다.

    http://dmaps.kr/f5itc

    국민대학교 앞의 출입램프는 진입과 진출이 하나로 이어져 있습니다. 점선과 실선으로 진입, 진출 우선순위가 표시되어 있습니다.

    내부순환로로 들어오는 차가 먼저 진입하게 되고, 나가는 차량은 50미터 정도 지나서 점선+실선 구간을 이용합니다. 전체 길이 100미터 정도 구간입니다.

    문제는 하나로 이어진 램프를 통과하도록 네비게이션이 안내하는 것입니다. 국민대 램프 아래 도로에는 횡단보도가 있습니다. 그러니까 램프를 고가도로처럼 사용하면 횡단보도 하나를 건너뛸 수 있습니다.

    이 상황은 두가지 면에서 위험합니다.

    첫번째, 진출차량이 많아지니 정체가 생기면서 들어오는 차와 나가는 차가 엉키게 됩니다.

    두번째가 더 위험합니다. 교통량이 없을 때, 이 램프를 고가도로처럼 이용하는 차량은 고속으로 지나가고, 진출차량은 갑자기 정상속도로 주행하는 차가 뒤에서 나타나는 상황이 생깁니다.

    처음에는 그냥 얌체 운전자들의 문제로 생각했습니다. 그러다가 티맵이 켜진 상태로 그 구간을 지나면서 네비게이션에서 그렇게 주행하도록 안내하는 것을 알게 되었습니다.

    그게 2년쯤 전이었습니다. 어느날 갑자기 거길 도로로 이용하는 차들을 보기 시작했고, 그 이유도 알게 되었으니, 당연히 수정될 것으로 기대하고 있었지만 그렇지 않습니다. 다른 앱의 경우도 지도를 공유할테니 같은 문제가 있지 않을까 짐작하고 있구요.

    다시 강조하지만, 진출하려는 차량은 진입하는 차들에 가려서 여길 주행하는 차를 보지 못하는 상황이 종종 발생합니다.

    방금 티맵 홈페이지 https://www.tmap.co.kr 에서 장소 수정요청을 했습니다. 정릉램프 외에도 전국에 이런 구간들이 있을테구요. 단편적인 수정이 아닌, 근본적으로 “램프”에 대한 정의를 다시 해야 하지 않을까 합니다.

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    OC139 NPN Germanium transistor works great with Bum fuzz unit

    I just tried this from a hunch while I barely understand electric circuits.

    Bum fuzz was made after B&M fuzz. it came from Tonebender Jumbo, and Jumbo came from Big muff. and they are not far from Tonebender MK3. it means this pedal would work with Germanium transistors.

    Sola Sound make 3 different versions of Bum Fuzz units with BC184, BC549C, and ZTX109. BC184  and ZTX109 versions look same to each other except ZTX109 version comes with better and older electric components. BC549C comes with cheap ass version. and, it has 3 of different resistors and 2 of electrolytic capacitors at least. I replaced them with 33k, 100, and 100k resistors an 2 of 0.1uf fixed caps.

    OC139, OC140, OC141 are NPN germanium transistors for computers (yes, the computer) from late 60’s. They are period correct for late 60’s and early 70’s fuzz I guess. and, have the similar Hfe range as well. most of them I found on ebay.co.uk had 100 to 200 Hfe range. some are less than 100, and some of them are over 200.

    It’s the shop I found ZTX109, OC139 and some NOS Omeg pots. they have OC141 as well.

    https://www.ebay.co.uk/str/J-H-Components-Limited/Transistors-Vintage-Germanium/_i.html?_storecat=14509182015

    And, this pedal sounds great with OC139. I don’t see any reason to try a different setup anymore. this modified Germanium Bum fuzz unit has overdrive to medium or leather high gain fuzz range now. somewhat sounds like MK2 and feels like MK3.

     

     

    It was like this a couple of months ago

    Inside of Sola Sound Bum Fuzz Unit – Cheap ass version

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    1. ztx109는 sola sound에서 광고한 것만큼 매력적이었습니다.
      구매는
      https://www.ebay.co.uk/itm/ZTX-Transistors-Series-See-Variations-In-Drop-Down/371068472941
      에서 가능하구요. 개당 2천원 정도입니다.

      참고로 저 ebay shop은 묶음배송이 수동입니다. 한가지 물품을 살 때는 알아서 계산이 되는데, 몇가지를 장바구니에 담으면 운송비가 모두 합산되어 버립니다. 그냥 결제하면 알아서 운송비 차액을 다시 환불해줍니다.

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    Germanium diode clipper reduces the output volume

    I tried germanium diodes on my Bum fuzz. and, noticed they reduces the volume dramatically. the maximum volume of the pedal was almost identical to guitar’s output volume. the pedal worked great with almost zero noise.

    I came back to the silicon diodes.  and, found out the reason why Germanium diodes clipping circuit output level was low

    https://www.coda-effects.com/2018/08/the-different-types-of-diodes.html

    The voltage drop of Germanium diodes is 0.35V while silicon’s is over 0.5V. the answer was simple and helpful.

    they are the Germanium diodes I tried. bigger than the stock silicon diodes. the picture of stock silicon diodes is following it

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    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 from the many sources on the web. and, I believe there were few different transistors Sola Sound tried at 70’s for this fuzz.

    I replaced the components 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 difference anyway. this bum fuzz sounds a bit older and bit alive than the original state with BC549C

     

     

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    Pignose 7-100 from 70’s with Germanium transistors

    Grabbed this 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.

     

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    I’m into 5v4g than 5y3 with 6v6 tweed amps

    5v5g makes tweed champ and deluxe more alive. I got stepped closer to the stage or somewhere inside of the studio where the band is playing. I’m hooked up champ, deluxe, and m-track 2×2 and listening music and plying guitar passing by a boost pedal. the difference is huge to me.

    https://www.thegearpage.net/board/index.php?threads/swapping-rectifier-tubes-5ar4-vs-5r4-vs-5v4-vs-5y3.1382681/

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    습기로 변형된 스피커 수리

    콘과 댐퍼의 사이가 부분적으로 떨어져서 극극거리던 챔프의 8″ 스피커를 수리한 적이 있습니다. 한번 경험을 하고 나니, 이런 상황에서 어떤 잡음이 들리는지 알겠더라구요.

    다른 스피커에서도 같은 소리를 들을 수 있었습니다. 클린에서도 작은 알갱이가 들리고, 음량도 충분치 않았구요. 얘는 습기로 콘이 한쪽으로 치우친 상태였습니다. 댐퍼와 분리하고 다시 접착하고 나서는 소리가 제대로 납니다.

    얘는 콘에 구멍이 있어서 싸게 구했습니다. 거의 미사용 상태로 방치된 녀석이었습니다. 콘은 쉽게 수리가 되었는데, 앞서 말한 증상이 한번 더 손을 봤습니다.

    떼어서 다시 붙인 자리는 이곳입니다. 에폭시가 마르는 중이라 반짝이는 것을 볼 수 있습니다.

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    Fender – Jensen speaker phase were reversed in 50’s tweed amps

    I just tried 9V battery trick for 50’s Fender Champ and Deluxe. and the speaker wiring turned out being reversed. both of them still have the factory wiring.

    And, both of them move backward (to the magnets) when they wired 9V + to the white wire, and – pole to the black wire.

    They mostly say there is no absolute speaker phase unless they are in the same cabinet. at the same time, many people say the speaker cones move forward when they hooked up in the right direction with 9V battery.

    Fortunately, 9V battery didn’t kill my 8″ Champ speaker, nor 12″ Deluxe speaker. but I’ve read some cases this trick killed their speakers.

    I’m not sure with 50’s and 60’s Jensen speaker’s correct phase. but, I started to believe Fender hooked them up this way. I’ve seen only 2 cases. and will update if I come across a different case.

     

    보통 9V 배터리를 스피커의 +, – 극에 맞게 연결하면 스피커 콘이 앞쪽 (마그넷의 반대방향)으로 움직인다고들 하는데, 50년대 펜더 챔프와 트위드 딜럭스는 그렇지 않습니다. 이 두 앰프는 흰색선에 +, 검정선에 -극을 연결하면 뒤로 (자석 쪽으로) 움직입니다. 앰프 두대가 반대로 연결되어 있을 확율은 낮아서요. 더 찾아볼 생각입니다.

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    NPN Germanium transistor list for Fuzz pedals

    My interest in fuzz pedal came from JMI Tone Bender III reissue which belongs to a friend. this pedal has 3 of OC75 glass tube transistors.

    And, unfortunately, My Sola Sound Bum Fuzz came with 3 of NPN transistors while OC75 is PNP type. then found this web page with germanium and silicone transistor lists

    http://vintageradio.me.uk/info/radiocon_data_trans.htm

     

    There are 26 of germanium NPN transistors from the data sheets

    ASY28, ASY29

    2N388, 2N388A

    2N1302, 2N1304, 2N1306, 2N1308,

    OC139, OC140, OC141

    AD161

    AC187

    NKT713, NKT773, NKT774, NKT781

    2SD72

     

    Black glass tube NPN transistors are OC139, OC140, OC141 from them.

     

    OC75 is like this according to this web page on alltransistors.com

    Type Designator: OC75 (PNP)

    Maximum Collector Power Dissipation (Pc): 0.125 W

    Maximum Collector-Base Voltage |Vcb|: 20 V

    Maximum Collector-Emitter Voltage |Vce|: 20 V

    Maximum Emitter-Base Voltage |Veb|: 10 V

    Maximum Collector Current |Ic max|: 0.01 A

    Transition Frequency (ft): 0.1 MHz

    Collector Capacitance (Cc): 50 pF

    Forward Current Transfer Ratio (hFE), MIN: 55

     

    And, for OC139, OC140 is

    Vcb: 20 V / 20 V

    Vce: 20 V / 20V

    Forward Current Transfer Ratio (hFE), MIN: 40 / 75

     

    I’m going to try OC139. simply beccause, OC139 is cheaper than OC140 on ebay. and I’m wondering how Transition Frequency differences work with Fuzz. I’ll update in a few weeks

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