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I dropped by a friend’s place to pick up my big red bum fuzz and hang around. then I dug this EH germanium OD out of a big plastic box.
I’m not sure what this NTK275 exactly is. but the same one shows up on ebay. and I guess it came from 60’s or 70’s
It’s the pile I dug out my bum fuzz and this germanium OD. I know few more guys with the same symptom. falling in love with fuzz pedals. don’t worry. some of them have wives or girlfriends. not all of them of course.
purchased Adzam branded Heerlen 12ax7 and Brussels 6v6gt from from this ebay seller. they were NOS and the pricing was very good indeed.
he sent me this tube puller. this silicon tool designed to grab the preamp tubes and the the tubes like EL84. you still need to hold the tube using this puller. and it feels easy may protect the letters on the tube
MR-4BX series has been produced for only a couple of years. the first version came at ’06 and replaced with B-Max4 which was different from previous yoke buggies at ’08.
MR-4BX series is like the last blood of traditional Yokomo to me. and I see the same blood on Jconcepts BJ4.
I have managed to get a nicely used Worlds edition last month. and took some pics with my factory edition. they both came at ’07.
the differences between them are main chassis, F/R shock towers, top deck(s), steering, rear bulkhead, and a few misc parts
MR-4BX Worlds came with a new camber mount which allows only the longest upper rod setup. also the steering is different than previous 2 versions
this new camber mount can be installed on older versions as well
the steerings are quite different. I hope I can feel the difference while I’m running this Worlds edition. but, didn’t have a chance so far.
this steering was introduced with MX-4. prototype MX-4 still had older servo saver. and the first time I saw this was in MX-4 kit.
but the difference is the angle. this steering system on MR-4BX is tilted for better handling.
MR-4BX Worlds came with this 1 piece chassis with 2 extra holes for new steering system. please ignore the stainless screws on the Factory chassis. I’d go back to the black steel screws.
the top deck, now it covers the rear belt. and new camber mount is here
Factory edition had 2 piece top deck like the original version. but the rear piece was improved that older one has clearance problem with the belt
there were a few guys tried this before Worlds edition came. the shocks were moved to the back end of the car.
also they put a camber mount like the front end
the original and Factory edition had same suspension geometry. the shocks can be moved to the back end with this stock mount plus a few tricks
the new aluminum part which holds the the shock tower is changed along with new bulkhead and camber mount
Steve Winwood + Eric Clapton
I’m running this small version of Buggy Champ – Rough Rider for years. yes, it’s small and cannot run on the bumpy tracks.
and I watched it’s not bad on the the rally circuit where I’m running my old RC10 and 834B runners.
this tamtech champ came with the plastic spring dampers. buggy champ runs like tamiya grasshopper with the stock shocks. actually it runs better than grasshopper.
google found me Losi Mini-T shocks weeks or months ago. an I’m running with the shocks. losi shocks turned this tiny champ into a racer.
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
There are 26 of germanium NPN transistors from the data sheets
2N1302, 2N1304, 2N1306, 2N1308,
OC139, OC140, OC141
NKT713, NKT773, NKT774, NKT781
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