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Old 14th May 2019, 12:31 am   #1
Matthew kane
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Default Another AVO MK4 valve tester thread

Hello everyone,

I'm currently restoring a mk4 that was in battle scarred condition, upon re-installing all the front panel rotary switches (was a struggle in the cramped space) I've noticed 4 snapped wire's.

There is a snapped red lead on the last wafer/deck of the electrode switch, the grey lead from one side of contacts of A1/A2 dp switch and a white lead on the mains switch.

Would anyone happen to have a picture of the internal sides of the rotary switches showing where these lead connections for these wires go to?

Thanks,
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Old 14th May 2019, 12:26 pm   #2
Matthew kane
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Default Re: Another AVO MK4 thread

Ok, bit of an update. Worked out where the white lead of the mains switches goes to, straight to the set mains rotary. Still trying to work out what connector a broken red wire from R38 24kohm resistor goes to and the grey wire from the unlimited/anode1-2 toggle switch connects to on the electrode selector switch.
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Old 14th May 2019, 12:42 pm   #3
Sinewave
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Default Re: Another AVO MK4 thread

Model 8/9 presumably?
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Old 14th May 2019, 1:48 pm   #4
Matthew kane
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Default Re: Another AVO MK4 thread

Quote:
Originally Posted by Sinewave View Post
Model 8/9 presumably?
VCM Mk4 valve/tube tester.
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Old 14th May 2019, 1:59 pm   #5
AC/HL
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Default Re: Another AVO MK4 valve tester thread

Thread title updated
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Old 15th May 2019, 11:44 am   #6
Matthew kane
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Default Re: Another AVO MK4 valve tester thread

Here is a picture:

Note the red lead close to each near the switch.
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Old 25th May 2019, 12:30 am   #7
Matthew kane
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Default Re: Another AVO MK4 valve tester thread

Update to this thread, traced the wires and fixed the issue by a photo provided to me elsewhere.
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