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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 14th Oct 2011, 2:54 pm   #1
pwdrive
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Default Signal Corp. LS-3 Speaker

Hello all, I have a Signal Corp. LS-3 speaker and the input jack is smaller than the standard 1/4" jack any one know which jack this is.

Lawrence.
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Old 14th Oct 2011, 3:11 pm   #2
G4XWDJim
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Default Re: Signal Corp. LS-3 Speaker

Those smaller jacks are quite common on American equipment. I think they're nearly always 3 contact, a bit like a stereo plug. I can't find one to take a photo of but they shouldn't be too difficult to find.

A duff mic. like a T17 would yield one.

Jim
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Old 14th Oct 2011, 3:22 pm   #3
pwdrive
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Default Re: Signal Corp. LS-3 Speaker

Thanks for the reply Jim, yes I think they might be common enough for me to obtain one from somewhere, failing that I should be able to cobble up something. I've got it working on a match stick jobbie at the moment.

Thanks.

Lawrence.
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Old 14th Oct 2011, 5:13 pm   #4
OscarFoxtrot
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Default Re: Signal Corp. LS-3 Speaker

Quote:
Originally Posted by pwdrive View Post
Hello all, I have a Signal Corp. LS-3 speaker and the input jack is smaller than the standard 1/4" jack any one know which jack this is.

Lawrence.
If it's 4.4 mm (0.173") dia. then it's probably a "bantam" jack.

Eg Farnell
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Old 14th Oct 2011, 5:47 pm   #5
pwdrive
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Default Re: Signal Corp. LS-3 Speaker

Thanks, I have also now been informed that the jack plug to fit the LS-3 is commonly known as a PL68.

(Addition) According to my calipers the socket fitted to the speaker is just a fraction over 5 mm dia.

Lawrence.

Last edited by pwdrive; 14th Oct 2011 at 5:55 pm. Reason: addition
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Old 14th Oct 2011, 5:55 pm   #6
M0FYA Andy
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Default Re: Signal Corp. LS-3 Speaker

Lawrence.
FairRadio have them listed at $8 new, $6 used............
I think they have a $20 minimum order.
Andy
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Old 14th Oct 2011, 6:02 pm   #7
pwdrive
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Default Re: Signal Corp. LS-3 Speaker

Thanks Andy. I see they have the LS-3's also, although I am happy with one I have.

Lawrence.
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Old 14th Oct 2011, 6:21 pm   #8
OscarFoxtrot
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Default Re: Signal Corp. LS-3 Speaker

.206" COMMERCIAL HEADSET MIC PLUG
8.93 here; P&P looks reasonable. No connection with / experience of the seller.
http://shop1.actinicexpress.co.uk/sh...php?section=27
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Old 14th Oct 2011, 6:22 pm   #9
M0FYA Andy
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Default Re: Signal Corp. LS-3 Speaker

I dread to think what the postage for an LS-3 would be from the US!
Andy
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Old 14th Oct 2011, 6:25 pm   #10
pwdrive
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Default Re: Signal Corp. LS-3 Speaker

Andy...PM me if you want to know!

Lawrence.
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Old 14th Oct 2011, 6:32 pm   #11
pwdrive
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Default Re: Signal Corp. LS-3 Speaker

Quote:
Originally Posted by OscarFoxtrot View Post
.206" COMMERCIAL HEADSET MIC PLUG
8.93 here; P&P looks reasonable. No connection with / experience of the seller.
http://shop1.actinicexpress.co.uk/sh...php?section=27
Looks like that's the one.

Lawrence.
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Old 21st Oct 2011, 8:45 am   #12
vosperd
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Default Re: Signal Corp. LS-3 Speaker

I think it is 3/16".
If you are careful you can drill the socket out to 1/4" if you are don't mind it not being original.
Don m5aky
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Old 21st Oct 2011, 4:05 pm   #13
pwdrive
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Default Re: Signal Corp. LS-3 Speaker

Hello Don I have found a source for the Jack Plug, years ago I would not hesitate to drill the socket out but not now, one of the reasons is that I can't get the socket out to do an operation like that as despite removing all the cabinet screws the front plate is well sealed on to the main box with the original MFP treatment and is stuck solid.

Lawrence.
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