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I need some info on an odd situation. I have a Sears (Bell and Howell) standard 8mm magnetic sound projector. “Soundstage” series. I went to plug in one of my extension speakers but my standard 1/4” Jack didn’t fit the hole! To be specific, the insertion hole was sooo close to 1/4”, but just on the shy side? What do you know about this? Is there a patch cord that can convert to 1/4”
John Morgan
This is an interesting topic (...at least to me!). I looked up standard sizes of phono plugs and came up with 1/4" (6.35mm), 1/8"(3.5mm) and rare ones down at 1/10" (2.5mm). There is nothing almost 1/4" but not quite. I wonder if maybe this is not exactly a standard phono plug, but something that looks like one, at least from the outside.
(Can you look inside the machine and see what it looks like there?)
Something I found out that surprised me quite a lot is how old this technology is. The standard 1/4" plug and jack started out as a means for telephone operators to connect lines back before rotary dialing, so I knew it was old, but it turns out there were patents for a pretty familiar 1/4" plug and jack going back to the 1880s.
I remember them from working in telecoms. !/4" plugs with "Tip, ring and Sleeve" connections, not the quite same as mono audio 1/4" plugs in their profile.
TRS plugs are interesting. They are almost always called "stereo plugs". When you have an analog headset for example, they are what plugs into the device you want to listen to. In this case they are left(tip), right(ring) and common return(sleeve). They aren't always though. In a balanced connection, they are monaural: signal(tip), return(ring) and ground(sleeve). This isolates the audio from ground to prevent ground loops. Of course, you can still have stereo, you just need two of 'em! Very often gear like audio mixers use this scheme. When I first got my mixer, all of a sudden I was confronted with a device that wanted 1/4" balanced TRS connections, but my super-8 setup was based on 1/8" unbalanced (TS). Suffice it to say I didn't have it up and running for a while!
Every time I hook up some new device, it's "OK: what kind of cable will this one need?!" (-all part of the fun!).
This is part of the reason I keep finding these plastic bins full of old cables around the house: I'm donating the standard ones to a thrift store: simplify life a little! (They'll find work in somebody else's house.)
What I always find odd is I've never seen a twin track or stereo projector with a single TRS stereo connection. For example the GS1200 is two Tip-Sleeves: one right and one left.
3/16" plugs and jacks aren't hard to find (once you know such things exist!).
I looked for "3/16" to 1/4" adapters" and found a ton of automotive brake line parts, but electronic plugs are out there too: a little wiring and soldering and John can have his adapter.
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