post any music you want to share
haven’t checked the serial nubmber. it just looks came from between 1964 to 1965. someone added an extra diode on the original one. but the original diode works fine without it. more than one component have replaced at some point.
the output level is too low and I guess it’s the filiter caps. it has 20+20+20+20uf 450v multi cap.
I have emailed to dozens of electric part suppliers and messaged to ebay sellers for
and I noticed most of them are counterfeit. this seller looked legit with the picture of NOS Siemens relay. but it didn’t go well.
and it’s the the relays I got from this seller
The original Siemens, Tyco, TE connectivity relays have molded bottom with thick and strong lead pins. and, you can buy this counterfeit relay on alibaba.com or aliexpress.com for less $1 each
I’m talking to these two sellers for the original part. and one of them are running this web site
I do trust this guy and made a purchase from his ebay store
also this seller has the original relay. but it’s V23084-C2002-A403
the only difference between A303 and A403 is the contact material. and C2002 is sensitive type works with less current as far as I know. I’ll try them both and will update
another seller sent me this picture. and it’s exactly the relay I’m after. you can see the pattern on the bottom but even many of the counterfeit have the patterns as well. but please see the pins carefully all the soldering pins are thick and look strong enough.
I’m ordering a pair from this seller who sent me the picture
it took a couple of months to figure out which is the original and finally found these 2 sellers which I trust on ebay.
I’ll update when they arrive
and please someone advice me if V23084-C2001-A303 can be replaced with
V23084-C2002-A403, or V23084-C2001-A403
I got myself this front axle mod idea from rc10talk.com forum when I wanted to put Yokomo 2.2″ wheels on my RC10 runners a couple of years ago. Associated #7222 axles are everything actually. there are not much left to do except for getting the axles if you want to use B4 or JC rulux wheels
longer axle on the right side is ASC7222 that makes you can use none-offset wheels like B4’s, Yoke 4WD’s, and more
Yokomo made TH-1 wheel adapters for RC10. early TH-1 came with front adapters as well. but later TH-1 didn’t
got this after I trimmed the each side of Ultima front hub from TH-8 package above. the diameter is “slightly” larger for 3/16″ bearings. but the tiny play (gap) was fixed with Loctite. then I’v been using the hubs without a issue
found this nice and old datasheet probably was a part of the Jensen brochure. and it’s great to see the exact output of the 50’s Jensen speakers. P12R was the stock speaker for tweed deluxe. and now I can see why it came with tweed deluxe. btw, P12R and P12Q share the same bell cover. and you cannot install P12N and P12P with the bell in tweed deluxe because of the size.
P12R = 12watt
P12N = 18watt
and, this thread in the same forum says
P12Q = 14watt
P12P = 16watt
I’m trying CTS 8″ 4ohm speaker which looks and sounds pretty close to Jensen P8T. even it sounds like my stock Oxford 8EV speakers. actually it’s better with this great condition
the filter caps are 33uf+10uf+10uf from Philips Holland factory. and replaced the power tube cathode bypass cap with 47uf to tame the midrange and bass. I like this setup and this vintage CTS 8″ sounds more like my vintage P12R and P12Q.
it’s a huge upgrade while my friend is getting his own vintage speaker. he is working on a P8U frame with recent cone which is close to the original cone.
I tried recent Mallory 150P, Jupiter yellow caps made after Astron blue point. and the final setup is Roederstein .022uf 630v caps.
the stock speaker from Weber is not bad while the breakup threshold is way different. but it still sounds good to me. and it seems to take a while to break in.
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
it’s getting better with some NOS caps and tubes. 50’s Jensen does something of course. VHT standard 12 is a bit bigger than the original tweed deluxe. and I like this cabinet as well. I might try P15N at some point
Unhappy with the life of your smartphone battery? Thought so. Help could be on the way from one of the most common, yet poorly understood, forms of power generation: static electricity.
“Nearly everyone has zapped their finger on a doorknob or seen child’s hair stick to a balloon. To incorporate this energy into our electronics, we must better understand the driving forces behind it,” says James Chen, PhD, assistant professor in the Department of Mechanical and Aerospace Engineering in the School of Engineering and Applied Sciences at the University at Buffalo.
Chen is a co-author of a study in the December issue of the Journal of Electrostatics that suggests the cause of this hair-raising phenomenon is tiny structural changes that occur at the surface of materials when they come into contact with each other.
The finding could ultimately help technology companies create more sustainable and longer-lasting power sources for small electronic devices.
Supported by a $400,000 National Science Foundation grant, Chen and Zayd Leseman, PhD, associate professor of mechanical and nuclear engineering at Kansas State University, are conducting research on the triboelectric effect, a phenomenon wherein one material becomes electrically charged after it contacts a different material through friction.
The triboelectric effect has been known since ancient times, but the tools for understanding and applying it have only become available recently due to the advent of nanotechnology.
“The idea our study presents directly answers this ancient mystery, and it has the potential to unify the existing theory. The numerical results are consistent with the published experimental observations,” says Chen.
The research Chen and Leseman conduct is a mix of disciplines, including contact mechanics, solid mechanics, materials science, electrical engineering and manufacturing. With computer models and physical experiments, they are engineering triboelectric nanogenerators (TENGs), which are capable of controlling and harvesting static electricity.
“The friction between your fingers and your smartphone screen. The friction between your wrist and smartwatch. Even the friction between your shoe and the ground. These are great potential sources of energy that we can to tap into,” Chen says. “Ultimately, this research can increase our economic security and help society by reducing our need for conventional sources of power.”
As part of the grant, Chen has worked with UB undergraduate students, as well as high school students at the Health Sciences Charter School in Buffalo, to promote science, technology, engineering and math (STEM) education.