Originally posted by Helmholtz
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Traynor YCV-40 No Reverb
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Originally posted by Helmholtz View PostNow we know that:
1) Reverb recovery stage works fine.
2) Reverb drive stage works fine.
Here's another test:
Connect the reverb output cable to tank and powered amp, reverb control up, speaker connected.
Connect the reverb input cable to the tank only.
Now momentarily (!) connect a 9V battery to the open plug contacts of the reverb input cable (may require the use of a battery clip).
Can you hear the reverberated pulse?
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If you did the battery test correctly (amp powered, out of standby, reverb pot up, one battery pole to plug pin, the other pole to outer ground contact),
this means that the voltage is not getting to the input transducer or the transducer is bad.
As before with cable connected to reverb input, measure DC resistance between the contacts of the open plug.- Own Opinions Only -
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Here's a funny little story:
Had a reverb contact problem with a Fender amp lately. So I measured the reverb cables (original Fender set with grey insulation, red and grey plugs).
No continuity at all between both red and grey plugs ??
Finally I found out that each of the cables had one red and one grey plug and I had been measuring between different cables- oh well!Last edited by Helmholtz; 10-17-2021, 06:00 PM.- Own Opinions Only -
- Likes 2
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Originally posted by Helmholtz View PostHere's a funny little story:
Had a reverb contact problem with a Fender amp lately. So I measured the reverb cables (original Fender set with grey insulation, red and grey plugs).
No continuity at all between both red and grey plugs ??
Finally I found out that each of the cables had one red and one grey plug and I had been measuring between different cables- oh well!
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Originally posted by Helmholtz View PostIf you did the battery test correctly (amp powered, out of standby, reverb pot up, one battery pole to plug pin, the other pole to outer ground contact),
this means that the voltage is not getting to the input transducer or the transducer is bad.
As before with cable connected to reverb input, measure DC resistance between the contacts of the open plug.
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Originally posted by Helmholtz View PostIf you did the battery test correctly (amp powered, out of standby, reverb pot up, one battery pole to plug pin, the other pole to outer ground contact),
this means that the voltage is not getting to the input transducer or the transducer is bad.
As before with cable connected to reverb input, measure DC resistance between the contacts of the open plug.1 Photo
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Originally posted by ca7922303 View PostReturn positive and negative have continuity, send positive has continuity, return does not have continuity.
Does it mean that you checked end-to-end continuity of outer and inner cable conductors?
What I asked you to do is measure the resistance at the disconnected amp side RCA plug (i.e. between prong and ground sleeve of the same plug) of the rev. send cable, when connected to the tank input but disconnected from the amp.
Are the reverb cables original?
What type of tank do you have? Schematic calls for an Accutronics model # 4EB3C1B.- Own Opinions Only -
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Originally posted by Helmholtz View Post
Not sure what exactly you did here. Generally, please be more detailed.
Does it mean that you checked end-to-end continuity of outer and inner cable conductors?
What I asked you to do is measure the resistance at the disconnected amp side RCA plug (i.e. between prong and ground sleeve of the same plug) of the rev. send cable, when connected to the tank input but disconnected from the amp.
Are the reverb cables original?
What type of tank do you have? Schematic calls for an Accutronics model # 4EB3C1B.3 Photos
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Originally posted by Helmholtz View Post
Not sure what exactly you did here. Generally, please be more detailed.
Does it mean that you checked end-to-end continuity of outer and inner cable conductors?
What I asked you to do is measure the resistance at the disconnected amp side RCA plug (i.e. between prong and ground sleeve of the same plug) of the rev. send cable, when connected to the tank input but disconnected from the amp.
Are the reverb cables original?
What type of tank do you have? Schematic calls for an Accutronics model # 4EB3C1B.1 Photo
Comment
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Originally posted by Helmholtz View Post
Not sure what exactly you did here. Generally, please be more detailed.
Does it mean that you checked end-to-end continuity of outer and inner cable conductors?
What I asked you to do is measure the resistance at the disconnected amp side RCA plug (i.e. between prong and ground sleeve of the same plug) of the rev. send cable, when connected to the tank input but disconnected from the amp.
Are the reverb cables original?
What type of tank do you have? Schematic calls for an Accutronics model # 4EB3C1B.
Comment
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Originally posted by ca7922303 View Post
Photos of send RCA cable(disconnected from amp), connected to input of reverb tank, black lead of dmm to shield, red lead of dmm to positive.
Connect the other cable to the tank output jack (with both cables disconnected from amp) and measure resistance at the amp side RCA plug.
And make sure I can read the unit in the display.- Own Opinions Only -
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