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Spot the deliberate mistake

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kedwardsleisure View Drop Down
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    Posted: 18 April 2013 at 2:37pm
2 x celestions in a Vox AC30.

First person to spot the mistake gets a picture of a slice of my dad's birthday cake

Kevin

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Post Options Post Options   Thanks (0) Thanks(0)   Quote mk2_ginger_biscuit69 Quote  Post ReplyReply Direct Link To This Post Posted: 18 April 2013 at 2:47pm
looks like they are wired in series, but for some reason one seems to have been wired to the right driver chassis to 'earth' it, and judging by the size of the tabs, they are wired out of phase [+ / - / - / +]?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote all bass Quote  Post ReplyReply Direct Link To This Post Posted: 18 April 2013 at 2:49pm
Lovely wiring technique, how would you call it?   
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve_B Quote  Post ReplyReply Direct Link To This Post Posted: 18 April 2013 at 2:56pm
It should have been at least 2.4mm cable?
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Elliot Thompson View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Elliot Thompson Quote  Post ReplyReply Direct Link To This Post Posted: 18 April 2013 at 3:09pm

Originally posted by kedwardsleisure kedwardsleisure wrote:

2 x celestions in a Vox AC30.

First person to spot the mistake gets a picture of a slice of my dad's birthday cake



The Jumper cable is wired negative (-) to negative (-) instead of positive (+) to negative (-).

Best Regrads,
Elliot Thompson
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Joe-Trojan Quote  Post ReplyReply Direct Link To This Post Posted: 18 April 2013 at 3:13pm
nice escher picture!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Creative Quote  Post ReplyReply Direct Link To This Post Posted: 18 April 2013 at 3:36pm
they are wired in series and are 16ohms giving 32ohms. The AC30 is a valve amp and would not have a 32ohm tap on the output transformer.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GEB Quote  Post ReplyReply Direct Link To This Post Posted: 18 April 2013 at 4:09pm
Should be wired like this in parallel?
  
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 18 April 2013 at 4:57pm
Yup,i have seen this sort of thing a few times,especially in 2x12's,are the drivers wired out of phase with each other? and they wonder why the cabinet doesnt sound quite right? Tongue


Edited by jbl_man - 18 April 2013 at 5:28pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote funkyparrot Quote  Post ReplyReply Direct Link To This Post Posted: 18 April 2013 at 5:13pm
Are they really out of phase? The solder tags are facing one another, therefore top becomes bottom.....Impedance will be too high, and why is one lead grounded to chassis?
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Creative View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Creative Quote  Post ReplyReply Direct Link To This Post Posted: 18 April 2013 at 5:22pm
No they are not out of phase but they are wired in series when it should be parallel. Once upon a time it was considered good practice to earth speaker chassis as a safety precaution. However earthing only one is a bit pointless. The only other thing is that the speakers are G12M. If this is an original vintage amp it would have been fitted with Celestion Blue speakers. They are still available. However they cost an arm and a leg and usually get replaced with something cheaper.

Edit. Having had another look at the photo I think both speakers are earthed.


Edited by Creative - 18 April 2013 at 5:26pm
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TONY.A.S.S. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TONY.A.S.S. Quote  Post ReplyReply Direct Link To This Post Posted: 18 April 2013 at 5:34pm
Anyone getting the cake yet?
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