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In Reply to: RE: Question about Technics ST-S4 tuner preset circuitry. posted by Steve O on November 04, 2020 at 18:16:38
Thanks for the reply. I am having a tough time finding 1.8 volt caps though. There are plenty of 3.3F ones, but the lowest voltage I can find are 2.7v; even at Digikey and Mouser. Nothing on eBay in China either.
Follow Ups:
You can use the higher voltage version wo issue. Don't go lower. Here's where physical size becomes a factor. All else equal, higher voltage will be larger but there have been advances since the 80s so it's certainly possible to find caps with higher capacitance and/or higher voltage that will fit just fine. I replaced the "memory cap" in an 80s era RS receiver with one that was twice the stock capacitance and 2.7V where original was something like 2.2V. New cap was approx same size as old. Do try and duplicate lead spacing for ease of insertion and neat appearance.
That really helps, thanks. The originals are 1/2 inch Dia. X 1 inch High. The are tightly spaced, and the cabinet sleeve won't allow any taller. I should be able to find three 2.7V / 3.3F caps, I hope. Cheers!
The supply houses almost always provide links to detailed data sheets so you can measure your parts and select new ones that match dimensionally. IME, the exact value of capacitance is not critical so you can increase or decrease within reason wo creating problems as space dictates. The primary effect of lower value will be reduced length of memory which may be of no or minor consequence depending on your expectations and how long you leave unit unplugged.
I didn't spend a lot for the tuner, less than the equivalent of US$10, so I just wanted to practice recapping and other basic work. This is the closest (in voltage and capacitance) that I have found on eBay, and very inexpensive too. Would they be OK?
It could be OK. OTOH, I'm unfamiliar with the brand and am wary of Chinese stuff from outside normal distribution channels. Remember the "sick cap" incident a while back? Personally, I'd look for something from the usual sources. As always, YMMV.
Well, the guy at the local parts supplier found a single 2.7V / 10F from Illinois Capacitor that he says will replace the three originals. The physical size is the same as one of the originals, so there won't be any fitting issues. Thanks for your advice.
Yes, Mr. President, it is probably time to dust off your Statute of Limitations calendar.
I decided against anything Chinese. Thanks again for your help.
It's over. You lost. So why do I still have to see your bloated orange face everywhere?
Mouser has Panasonic 3.3F @ 2.5V, measuring 20 mm L x 8 mm diameter (link below) which are shorter and narrower than the original memory caps in the tuner, so there should be no problem fitting them in.
Why gamble with Chinese caps of unknown quality?
I know what you are saying about Chinese stuff, and I don't disagree. This is a pedestrian tuner that cost me very little money, so I am not risking a lot if I waste another five bucks on the caps. The problem with the usual suppliers is that the shipping cost for three caps would prohibitive. I have a local parts supplier checking into it, and I am hoping that he could add them to his next order.
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