Larrystick
18 posts
Jun 08, 2013
5:20 PM
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I picked up a cool little vintage PA last week, and it's never been modified, but it has a couple 6L6 tubes in it, just like some of the Masco amps. I'd rather not drill it to add 1/4" jacks, but I cannot find out what the name of these kind of speaker connectors are.
Can anyone help me out? And where in God's green earth can I find plugs that would fit in them?
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Stickman from walkthatwalk.org
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rbeetsme
1251 posts
Jun 08, 2013
5:50 PM
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Old ones
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Harpaholic
202 posts
Jun 08, 2013
5:53 PM
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I've seen these before on the old portable pa's with separate
powered speakers. I had an old Cordovox accordion amp that
had those exact connections. I ended up having my amp tech
install a multitap connector right from the output transformer.
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Jim Rumbaugh
866 posts
Jun 08, 2013
7:22 PM
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Here's some insight from my old electronics days (40 years ago).
C=common
4= 4 ohm speaker connection
8= 8 ohm speaker connection
16= 16 ohm speaker conection
500 = I don't know
70v - 70 volt continuous line. Used where you have speakers throughout a building, like background music. A high voltage (70v) signal is run through the wires that go from room to room. At each room you installed a small transformer to step the voltage down to match the speaker. It's a similar to how the power company uses high voltage line to transfer power a long distance.
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theharmonicaclub.com (of Huntington, WV)
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dougharps
401 posts
Jun 08, 2013
11:23 PM
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I have two Stromberg-Carlson PA heads with this jack, although there are also connectors with screws for common and different Ohm taps on each amp (2-EL84s and 2-6L6).
A friend of mine got me a connector like that, but I usually just use the screw connections to a 1/4" jack using the appropriate impedance for the speaker cabinet I will use. I don't know where he got the connector. I will check and try to get more info.
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Doug S.
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Greg Heumann
2191 posts
Jun 09, 2013
7:37 AM
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I have a jack like that on the back of my Masco ME-18. I hardwired a 1/4" jack. Plugs for those sockets are virtually impossible to find, but some vintage amp gurus like Skip Simmons may have some.
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/Greg
BlowsMeAway Productions
See my Customer Mics album on Facebook
BlueState - my band
Bluestate on iTunes
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Larrystick
19 posts
Jun 09, 2013
11:24 AM
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Yup, I haven't found any answers yet. Looks almost like there's enough room in the center to drill it out and put the 1/4" right in the middle. That would make me happier than putting another hole or two in the chassis.
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Stickman from walkthatwalk.org
Last Edited by Larrystick on Jun 09, 2013 11:25 AM
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GEEZER1
186 posts
Jun 09, 2013
12:15 PM
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In old Ham Radio days we would take a glass tube with the right socket pin configuration and use the tube base for a connector. A bad tube of course, but even those are hard to come by now.
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Greg Heumann
2192 posts
Jun 09, 2013
1:27 PM
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I wouldn't try to drill out the center. Difficult to do well - that's bakelite and it could shatter and ruin the whole thing. Plus it still has all the socket pins on the back, the socket labeling on the front. Just leave them there and put a new hole in the chassis - perhaps right between them and up a little bit.
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/Greg
BlowsMeAway Productions
See my Customer Mics album on Facebook
BlueState - my band
Bluestate on iTunes
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Larrystick
20 posts
Jun 09, 2013
1:29 PM
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Thanks Greg.
Excellent idea.
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Stickman from walkthatwalk.org
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Kingley
2738 posts
Jun 09, 2013
1:33 PM
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If you only need one jack socket then you could drill it where it says "EIA" that would look quite tidy. If you need two sockets then I'd drill the "EIA" spot and the same location on the opposite side. That would also look quite tidy.
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shbamac
338 posts
Jun 09, 2013
4:54 PM
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Six pin Amphenol, 86-CP-6 or AMPH-6M, those could be the part number I beleive, is what they are and they are easy to find. You can find them on Ebay or search google. You can find them NOS or used both male and female.
Last Edited by shbamac on Jun 09, 2013 5:50 PM
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nacoran
6847 posts
Jun 09, 2013
8:10 PM
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I didn't scroll all the way down, so I didn't realize someone had figured it out. I dropped the image in Google Image Search and got hubcaps. :) Oh well, their other products work pretty well.
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Nate
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Larrystick
21 posts
Jun 10, 2013
7:30 AM
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This is wonderful feedback. Thanks especially to shbamac for the part numbers!
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Stickman from walkthatwalk.org
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