[sdiy] Buzzing reverb

[Bob Weigel]

Yeah that's what I tried to say..not sure if my mail got through. Reverb 
cans OFTEN have problems with coil connections to leads (they fail in 
mexico to use strip-x or equiv to pull the enamel off the wires it 
appears..and they just solder and say a prayer.)  check again the 
impedences to the can. Input depending on can should be between almost 
nothing and a couple hundred ohms.  Output 20 to maybe 800. Most common 
ones I see in that kind of thing measure a DC impedence of 57 ohms on 
the in and 200 or thereabouts on the out.  If no connect on output 
you'll be amplifying an antenna. -Bob
harrybissell wrote:

>oooh... my bad
>
>I missed a clue.  If the Parametric EQ works without hum, but he reverb
>DOES hum... its is very likely NOT a cap in the power supply !!!  Broken
>wire, or EMI.  Or it could be a bad connection at, or insdie the reverb
>tank itself. They usually use RCA connectors, famous for having corrosion
>etc...
>
>H^) harry
>
>jays at aracnet.com wrote:
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>>You haven't moved it next to something that has a lot of EMI have you?
>>
>>Reverbs are great for picking up AC hum from computer monitors and other units power supplies.
>>
>>Like Harry said, either bad caps or bad ground would be my guess after EMI. Usually linear power supplies aren't that bad to deal with.
>>
>>Jay S.
>>
>>Steve Begin wrote:
>>
>>    
>>
>>>I have an Intersound PRV-1 Spring Reverb / Parametric EQ, and when the reve=
>>>rb section is switched on, there's a really loud buzzing sound added to the=
>>> output.
>>>It does this regardless of whether or not there's an input present, and the=
>>> buzz would appear to be 60Hz.
>>>
>>>Would this mean it's likely one of the filter caps somewhere is dead?  If s=
>>>o is there anything anybody can tell me about how I should go about locatin=
>>>g the offending capacitor?
>>>
>>>Thanks,
>>>Steve=
>>>      
>>>
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