Mark IV (A) reverb on/off issue

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SpookyBonus

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Aug 5, 2010
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hey guys, so i got my mark iv home yesterday and its great
i cant believe they failed to add a jack for switching on/off the reverb on the A models
so i came on here and found out that you can just ground the signal to shut it off, as explained here:
"-Reverb switch on the A could be made by adding a RCA Y splitter to the input of the reverb tank with one side going to the reverb tank and the other side to a ground to tip short pedal. this shorts the reverb tank to ground effectively creating a on/off switch.WORKS GREAT!"

so i did that and now when the reverb is on i am hearing a faint buzz, i don't really remember it making that sound with the reverb on before i added the switch. so i took the switch out and tried it as it was originally, and it still had the faint buzz.

do other people with a mark iv have a slight buzz with the reverb up to about 7-8? (it's not very noticeable with the reverb low at about 3).
 
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