The amp is completely dead if the amp is completely silent no speaker hum or hiss at all then the problem can be just about anywhere in the amp but you should suspect a bad tube blown fuse or the power supply in that order.
Guitar amp power supply.
Joyo built in 4400mah rechargeable battery guitar effect pedal power supply 8 outputs 9v 12v 18v 100ma 500ma jacks 5v 1a usb port jp 05.
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The capacitor input supply will have a filter capacitor immediately following the rectifier.
Correct supply voltage reveals the original tone fundamental and that s the beginning and the basis of the signal chain.
And if you want to plug in a tone hammer preamp di box check out the aguilar tone hammer power supply it can handle input voltages from 120 up to 240 and it includes a bundle of ac adaptors so you ll be all set for your world tour.
The power transformer or pt receives the 120 volt ac supply from your wall socket and ramps it up to two or three times that amount in the first stage of many that provide the voltage that the tubes run on meanwhile the pt also produces a low voltage but high current 6 3v ac output that powers the tubes heaters.
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.
The choke input supply by definition must have a choke.
For example a leaky filter capacitor in the amp s power supply might be causing excessive hum and need replacement.
For a behringer ub1202 xenyx 1202 or q1202usb there s the behringer psu5ul 120v power supply.
Try a new rectifier tube.
But indiscriminate re capping of an old guitar amp may not be a sound idea.
Generally the capacitors in your amp should be replaced only for a reason.
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Hoffman amplifiers stocks tube amp parts for the diy tube amp builder hoffman amps ships guitar amp parts all over the world tube amp for guitar.
Isolated power supplies like this 1 spot pro from truetone helped silence the groans whines and ticks once common to pedalboards.
Finally if the amp has a tube rectifier it also.
At the dawn of the guitar effects age powering pedals was relatively simple if an effects pedal didn t take a standard 9v battery like your am transistor radio it plugged into the wall like your avocado green toaster.
Capacitor input filters are by far the most commonly used configuration in guitar amplifiers in fact i can t think of a production guitar amp that used a choke input filter.
A dependable low noise unit for touring or recording it powers psa aca and twin boss pedals and makes them sound their best at all times.
Brownbox is the first line level regulator designed exclusively for tube amp purists who understand where their tone originates.