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Crack;Bottlehead OTL - Page 439

post #6571 of 6572
Originally Posted by StivVid View Post

Just had a thought...  Do you know if your rca cables have a "floating ground?"  What I mean by that is, do they have the cable's braided shield soldered to the connector at one end but not the other?  Many so called "high end" cables are built this way.  It's supposed to have an effect on noise rejection, etc.  I've never heard a difference myself.


I just tried another pair of audio cables that fit this description, and sure enough--when I reach about 85-90% volume (with a source plugged in) I can hear a hum that gets a little louder as I go from 85-90% volume up to 100%.  Could be your interconnects.


I tried different cables and got different results - more or less buzzing at 90 % with different cables. Then I remembered reading over at Bottlehead's forum about shorting the inputs, as part of the troubleshooting process, and when I tried that the amp was absolutely quiet. I think that means the amp itself is ok.


Still I get noise even with nothing plugged in. Does that mean that the RCA inputs themselves are picking up noise?

post #6572 of 6572

Well, I'm no electrical engineer and I'm sure there are those better qualified to answer your question.


You will get hum from your amp when there is no source connected to the inputs.  I believe the reason for that is that those connectors are un-terminated until a source is plugged into them.  As soon as you plug a source in, the hum should disappear.


Someone correct me if I'm wrong.


You should visit the forums on Bottlehead's website.  They're really good about answering technical questions quickly and concisely.  Very helpful folks over there.

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