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Johno
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Joined: 20 Apr 2006
Posts: 1915
Location: East London
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 Posted: Sat Jul 25, 2020 4:08 pm Post subject: Dod 250 bypass issue |
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I love the Dod 250/ Mxr Dist + circuit(s)..... but my Dod does not pass signal when switched off, it's one of the old 3 lug switches, anyone know how to wire it so it passes signal when off?
I have 2 MXR's and one of them also has the 3 lug but passes signal fine.
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NickS
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Joined: 14 Jan 2008
Posts: 10414
Location: Nr. Basinggrad, UK
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| Posted: Sat Jul 25, 2020 7:13 pm Post subject: |
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| I see the bottom left MXR has been made true bypass.. I wonder whether the DoD was converted and converted back wrong. I can't see enough of the wiring to tell you what's wrong though. |
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Johno
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Joined: 20 Apr 2006
Posts: 1915
Location: East London
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| Posted: Mon Jul 27, 2020 4:20 pm Post subject: |
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Cheers Nick, I took some close ups if that helps.
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sunshiner
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Joined: 02 Nov 2012
Posts: 4948
Location: Around the corner
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| Posted: Mon Jul 27, 2020 5:37 pm Post subject: |
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Unrelated to the questions, but I'm curious how do the germanium diods behave in hot environment? Do they go meh the way germanium transistors tend to go?
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George
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Joined: 03 Jul 2009
Posts: 20945
Location: UK
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| Posted: Mon Jul 27, 2020 5:59 pm Post subject: |
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| I thought only the newer 250 reissues were true bypass. Could be wrong though. |
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holyCATS1415
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Joined: 24 Apr 2008
Posts: 1062
Location: PDX
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| Posted: Tue Jul 28, 2020 5:01 am Post subject: |
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| The footswitch is probably faulty. If you have a multimeter you could check if it’s good or not. |
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NickS
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Joined: 14 Jan 2008
Posts: 10414
Location: Nr. Basinggrad, UK
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| Posted: Wed Jul 29, 2020 10:03 pm Post subject: |
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| holyCATS1415 wrote: |
| The footswitch is probably faulty. If you have a multimeter you could check if it’s good or not. |
This looks like the answer. The wiring looks correct for the Carling 112-P footswitch, the output jack is connected to the common tag by a purple wire and the A and B are the purple wire from the input jack and the blue wire to the effect PCB that isn't connected to the input jack. Replace the 112-P. |
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Johno
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Joined: 20 Apr 2006
Posts: 1915
Location: East London
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| Posted: Fri Jul 31, 2020 2:11 pm Post subject: |
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| NickS wrote: |
| holyCATS1415 wrote: |
| The footswitch is probably faulty. If you have a multimeter you could check if it’s good or not. |
This looks like the answer. The wiring looks correct for the Carling 112-P footswitch, the output jack is connected to the common tag by a purple wire and the A and B are the purple wire from the input jack and the blue wire to the effect PCB that isn't connected to the input jack. Replace the 112-P. |
Thanks guys, off on my hols (lockdown willing) but will order a switch upon my return and report back.... |
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Mike
I like EL34s
Joined: 20 Apr 2006
Posts: 38353
Location: Edinburgh, Scotland
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| Posted: Sat Aug 01, 2020 11:44 am Post subject: |
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If you're replacing the switch anyway, I would plump for a DPDT latching footswitch and just make it true bypass so it doesn't roll off your top end when off.
But maybe that's already part of your TONE so you might not wanna screw with that
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