I'm testing my 6c33c SE amp and I use 8Ohm resistors as a load, since I don't want to damage my speakers if something should go wrong.
When feeding the amp with a music signal from a CD player I can hear music.
What's going on? What's making the music?
When feeding the amp with a music signal from a CD player I can hear music.
What's going on? What's making the music?
The OPT, or possibly a cap (many caps "bend" a little when a large changing voltage is put across them, most famously ceramics which are somewhat peizoelectric).
Usually nothing to worry about. If it's unusually loud, you might want to return your OPT - it might have a loose winding.
Tim
Usually nothing to worry about. If it's unusually loud, you might want to return your OPT - it might have a loose winding.
Tim
Roll up a magazine or use some other tubing as a stethoscope. Listen around until you find the source of the sound. I agree it is probably the output transformer singing.
heard that before
Believe it or not, I have heard (faintly) music from the tubes themselves when I accidently isolated the OPT from the speaks. At least I thought it was coming from the glass.
Believe it or not, I have heard (faintly) music from the tubes themselves when I accidently isolated the OPT from the speaks. At least I thought it was coming from the glass.
Re: heard that before
I had the same experience. Using a cardboard tube I zeroed in on the second tube in a PP pair. Pretty interesting but since tubes are microphonic I would imagine that could work both ways, make sound as well as pick up vibrations.
fragman56 said:
I had the same experience. Using a cardboard tube I zeroed in on the second tube in a PP pair. Pretty interesting but since tubes are microphonic I would imagine that could work both ways, make sound as well as pick up vibrations.
Makes sense though, same reason capacitors are microphonic when driven hard (for the last time people, ceramics are okay because no tube circuit runs more than 10mArms through them), the electric field changes the forces. Would have to be a pretty loose tube though, since those forces are very small over the voltage and distance in a tube.
Tim
Tim
You ought to hear it on a commercial SS amplifier with a 70 volt output transformer on it. You don't need a butt set to listen to some of the brands of amps out there.
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