There are LETHAL voltages
inside tube (valve) amplifiers.
NEVER but NEVER open up one and mess with it unless you are a qualified technician.
DANGER Lurks Inside Tube Amplifiers.
Furthermore, don’t touch tubes when hot, don’t spill liquids or operate in moist environment, use a cart for moving the amps, don’t chew components or soldered connections as they contain lead. Don’t open up oil capacitors and drink their liquids as some vintage ones contain carcinogenic chemicals.
Consider yourself warned that tube amplifiers with exposed components like tubes, transformers and capacitors are not children nor pet friendly.
Note that the opinions in this site
are clearly subjective but based mostly on
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