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Comments
I thought that replacing valves was a science so thought the chucking any of thing would be highly dangerous!
Yes I do. Because it might come in handy one day! My dad kept everything. If you were on my Facebook then you'd have thoroughly enjoyed the 'what's in the tin' game I shared when clearing the rest of the shed! He had all the default screws/bolts/washers in separate boxes/jars/tins but this game was about his keeping of seashells/castors/clothespeg springs!
If you’re going to stick it in, while it’s in there, turn the volume up and tap it gently(!) with a pencil. A dull thud is good, continuous ringing or a bell-like “dinggg...” is bad. Also do the same with your old valve and see if it sounds any different.
Knowing the valve is working and not microphonic is going to add a lot of value.
Or by regulated do you mean that the voltage should be reduced too? All the amps I can think of with partial DC filament supplies just rectify and smooth the AC supply, so the voltage is effectively higher.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein