brought this home to change the filter caps for a friend. my favorite tweed deluxe is 5D3. but love this one too
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did a simple job for a friend. he has some extra 50’s Jensen speakers and wanted to use them with this GT40 amp.
he told me GT40 has mono and stereo output mode. so, we decided to leave one of the 6.5″ speakers as it was. then put a long thread 1/4 jack on the other output.
the only place I found for the internal/external switch was the inside of the bass reflex vent on the back. the back panel itself is too thick to attach the switch.
Researchers at the Massachusetts Institute of Technology (MIT) and Harvard Medical School have teamed to develop a novel tattoo ink that can show your body’s health changes.
The novel ink consists of biosensors that react to changes in the tissue fluid and make the skin an “interactive display”. So far, researchers have investigated four biosensors that respond to three types of body information, changing their colors.
As the pH-value increases, the color changes from violet to pink, an increasing sodium content is seen as a bright green under UV light, and blue becomes brown when the glucose level increases.
This animation from a video of the researchers shows how such a tattoo might look like:
Especially for diabetics, a tattoo with ink that reacts to an altered glucose level could be useful. They have to prick their finger with a small needle if they want to measure their blood sugar level – usually several times a day. This procedure can be painful in the long run and can lead to small scars.
You can read more about this innovative technology here: https://www.media.mit.edu/projects/d-Abyss/overview/
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 and OC139 transistors
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
got this brazilian strat neck a couple of years ago. it has refinished before. unfortunately, it’s urethan finish on it. it still ages well though.
trussrod nut and the decal have replaced at 90’s by the owner before me. and I don’t think this Mechanicland neck came with the decal. the decal on the head is definitely a aftermarket product. and it looks funny a bit
everything else is great with this beautiful with brazilian fretboard. and, sounds stunning along with this light ash (not swamp ash) body
I grabbed this part lot off ebay. only what I need are the pulley bag. but the rest of them could be spare or could be a start for a new project.
the most important parts in this lot is this pulley bag. i used to have ZB-40 for rigid belt drive before. this ZB-40N is for the torque limiter setup.
NIB parts are getting hard to find everyday. I need more arms, c hubs, and steering knuckles always
new chain, very rare front oneway axles, rear dogbones, and steering linkage
I just tried 9V battery trick for 50’s Fender Champ 5F1 and Deluxe 5D3. 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 any Jensen speaker with different phase.
it’s a ’59 fender tweed champ with 8″ stock jensen speaker. I’ve learned more than a few things from this amp. mostly about the tone. and it forces me to play more than before I got this small tweed amp.
I’m using 5y3 rectifier for the original setup along with 5v4g for more clean headroom. and watching that huge rectifier from the back side. 5v4g and Bendix 5y3 look beautiful at night.
5F1 breaks up early and it’s the character of this amp. 5v4g makes 5F1 sounds a bit like tweed deluxe. but, it’s still tweed champ of course. and, I recently noticed 5f1 with 5v4g is more vulnerable to 60hz hum. so, I came back to the stock 5y3
a close friend gave me his NOS or like new silver p12r speaker for my tweed deluxe 5d3 a few months ago. then I got me a P12N which I like for the last 15 years.
but, I couldn’t help myself to search the original p12r with the bell. I mean p12r from the same era with the same color.
I dropped by his place a couple of days ago. he showed me this p12r pulled out of his 5C3 a while ago. it was the present for me and my 5d3. I ordered a speaker cone looked like the original even before I knew he had this. and I like the black switchcraft 1/4 plug which I’ve been after.