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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Most common faulty part in old electronic gear
Regarding this kind of switch:
http://www.parts-express.com/data/de...0-908_HR_0.jpg When it comes to working on old electronic gear from the 1950s thru 70s or 80s I keep reading the most common fault are the old paper/wax capacitors and electrolytics. While there is truth to this in some cases, I have found a part that fails about 90% of the time on these old devices. They are these old slide switches (shown above). I just picked up an old Sencor Substitutor box from the 50s or 60s. The caps and resistors are not looking to be bad, but all three of the slide switches are junk. Even after sliding them back and forth 100 or more times, they are erratic at best, or dont work at all. (I am awaiting a can of Deoxit from an online order, since I can not buy it locally). I have my doubts that even this stuff will fix these switches. Do they make more reliable replacements for this type of switch that will fit the same holes? Heck, even in the 70's when they were only a few years old, these switches were troublesome. I never understood the reason for gold plated speaker terminals, but these switches should be gold plated, or something done to them, since they were always faulty. |
#3
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Most common faulty part in old electronic gear
On Thu, 09 Mar 2017 01:58:01 -0600, wrote:
Regarding this kind of switch: http://www.parts-express.com/data/de...0-908_HR_0.jpg http://www.ckswitches.com/product-selection/slide/ Regards, Boris Mohar Got Knock? - see: Viatrack Printed Circuit Designs (among other things) http://www.viatrack.ca void _-void-_ in the obvious place --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#4
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Most common faulty part in old electronic gear
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#5
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Most common faulty part in old electronic gear
A lot of this has to do with location and storage. I have a lot of Dynaco audio stuff - and David Hafler was notorious for using low-bid/surplus/salvage and "seconds" stuff - that are generally pretty much fine as they have never seen damp, a garage, or unconditioned space in their 38 - 57 year histories. I have a number of vintage radios (TransOceanics) that are up to 30 years older that are also pretty good - as Zenith went at least one step up in initial quality. These switches get flushed before first use in any case.
But rotary and pot switches are a different story. Those I have had to learn to restore and/or rebuild. A PITA, but there are usually only a few bits inside to go bad. As to caps - unless they are potted or PIO caps, I do not even bother - they get replaced out-of-hand. It is not a matter of "if" but "when". Enjoy! Peter Wieck Melrose Park, PA |
#6
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Most common faulty part in old electronic gear
And:
There are kits out there for restorers: http://www.wisconsinpartsdatabase.co...switch-kits.pl Peter Wieck Melrose Park, PA |
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