took some pics at a friend’s place
the circuit board
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Came across this big red bum fuzz here on reverb.com
Sola Sound / Macaris sells a few different versions with different components along with the pricing. this one is a literally cheap, actually the cheapest version of them. they had/have more coming as well.
They have 3 different versions by the price. £399.00, £349.00, and £149.00. then I paid $29 for international shipping. mine is £149.00. it was $195 shipped to South Korea.
£399.00 and £349.00 versions come with the reliable components like Cliff jacks, Carling(could be Arrow H&H) DPDT footswitch, Omeg potentiometers (2 of log B 100K, 1 of linear A 100K), and better caps and resistors.
They put Zetex ZTX109 transistors on £399.00 version with better caps, even with the NOS carbon composite resistors, and probably with some tweaks.
£349.00 Bum Fuzz Unit comes with BC184 transistors. £149.00 version comes with the same transistors as far as I know. (update – this pedal came with BC549C known as a substitute for BC184)
But, £149.00 version has, as the name, cheap components include the plastic molded pots. the pots feel not good. but they still came from Piher at least. it has more unknown parts like 1/4″ jacks, footswitch, knobs, and ceramic caps.
I believe I can change some of the parts using the pics on Macaris.co.uk and Reverb.com. The schematics for Jumbo Tone Bender and B&M fuzz are on the web.
I’ll update with some mods and samples. here are the pictures
I’ve been using this 239 bulb after the factory GE #47 bulb went dead. 239 is same 6.3V and the bayonet base is identical to #47. mine came from Westinghouse as I remember. and found more from Tung-sol, Sylvania, Chicago Miniature, and more
239 rated 2.268 watt while 47 is 0.945 watt according to this web page. I’m wondering if I can go with this bulb. but didn’t have an issue yet
found this nicely built 5F1 with 10″ WGS speaker in Mergili cabinet on Ebay while I was in search of the parts for my first 5F1 build. grabbed it off for very good price and I’m changing the components and wires one by one like the filter caps, bypass caps, speaker wires along with the plug.
I think the speaker wires and Amperex 12ax7 changed way more than the capacitors. I’m waiting for yellow and red Jupiter 0.022 caps as well. an A/B comparison video on youtube was very interesting. and red one looks very close to the original Astron firecracker.
there are few tweed amp inspired cabinets around. and it’s the first cab I like except for the original ones. this cabinet sings with WGS ceramic speaker. I’ve been biased toward vintage Jensen alnico speakers so far. and this speaker changed it a bit
the orange filter caps are Roederstein 33uf 450v which replaced the stock caps from the kit. I didn’t know the limit of 5y3 and was brave enough to put two of them on it. then realized the rectifier was too hot and went to 33+10+10.
the first 33uf right next to the rectifier seems fine so far. I’ve tried on the original 5D3 and 5F1 without an issue before. this very capacitor is one of the caps I trust most
this 5F1 is dead quiet and the filament wiring is a bit different to the original champ. I’m trying to figuring out it. nothing is easy with the electric stuff even 5F1 is this simple.
I’ve got some NOS Sprague black beauty caps 15 years ago and tried it on this amp. I expected something vintage with them. but I’ve learned they are not useful as the coupling caps. they were good as the guitar tone caps. but they dramatically reduced the output volume regardless of the values. realized why my 18watt replica’s output volume was that low 15 years ago today. I’m still wondering why anyway.
[update] the sprague caps I put on this amp had twice high capacitance than the marking. I couldn’t find any 0.02 and tried 0.03 but they actually were over 0.05. higher capacitance changes the frequency and reduces the output volume as I learned from them. and NOS caps need time to break in. they sound getting louder for the last few days
with the dancing bears
Needed to see the B44.3 chassis to make a new chassis for this project. got the chassis along with the original Bj4 chassis. it’s the first time to see the original version. and I can see the wheelbase is identical to Bj4 worlds edition.
B44.3 chassis is 4mm longer than B44’s. but still the Bj4 and B44 bodies fit the chassis. the structure is different for the front and rear bulkheads. Bj4 was built with Nitro TC3 parts. and B44 series has it’s own bulkheads and tranny, diff cups and more
you can check the wheelbase here
And, the under tray came from B44.2 Bulldog body set from Pro-line
With some original Bj4 parts from Jconcepts, AE, and Losi
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via @BMM Read the full article here: https://www.bmmagazine.co.uk/business/which-methods-are-the-best-examples-of-data-mining/