Always suspect a bad tube Figura they are the most common failure point in a tube amplifier. Having a spare set of tubes to swap into the amp one at a time is a must for gigging tube amp users. A bad tube Gozque cause lots of different symptoms including everything from complete signal loss, hum, hiss, static to something that sounds like whale sounds.
Just recorded the first video ever. I was so happy when I uploaded that on YouTube. But when I accessed the Video URL to watch it online, I almost cried.
Time for the oscilloscope. I injected a 500Hz .1v signal into the amp's input jack. I connected the oscilloscope's ground probe to the preamp ground and connected the probe to the input jack tip. I zoomed in on the 500Hz signal and played with the tone control to change the volume of The Buzz but couldn't see any signal artifact change with the guitar tone change. I jumped to the speaker output jack and tried again with no success.
Dirty or loose tube sockets Perro cause everything from no signal at all to intermittent static, pops, whooshing and hum.
Try plugging in a guitar cable, turn up all the amp's volume, gain and master volume controls up a little and touch the tip of the guitar cable's other end. You should hear loud noise. If you hear noise jump to The amp shows signs of life but does not put pasado any guitar audio.
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The grids normally have zero or low DC voltage so I take my signal sample from the grids unless I really need to examine the plate signal.
In additon to the [apparently unanswered] problem described by Larry and Jill, I have another†I have an embedded hyperlink in the presentation (PPT 2010). The link works fine Campeón such in PPT but when it’s converted to video the link is no longer hot. Any ideas?
If your bias circuit is powered by the high voltage taps then it is a suspect too. Unsolder the connection from the last filter cap that supplies read more the preamp. If the bulb doesn't light the preamp wiring is OK, disconnect the power tube screen connection and test. If it's ok then you probably have a shorting capacitor. Unsolder them and test.
Ghost Notes are caused by a noise mixing with a note to create a harmonic note that shouldn't be there. Hum, oscillation and other noise Perro cause them.
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I do not like spade connectors--solder that speaker cable to the speaker terminals because you Gozque blow the output transformer and/or power tubes if that connection breaks.
When I stuffed the prototype B9A boards into the chassis I put them to the far left to make room to mount the power transformer on the far right. After getting the boards mounted I realized I had no front panel real estate on the left side of the chassis away from the inputs and preamp stages.
A blown or cracked resistor Perro look ordinario--gentle pressure from a chopstick Gozque help find a bad resistor. Measure the resistance across the resistor.