I've seen some tubes with dual grids. I wouldn't want to complicate things with that kind of tubes. Regular tube will be just fine.
First define what you want the tube to do, like transistors and ICs, they come in many shapes and sizes and are designed for different purposes. If you want a loudspeaker amplifier, you probably want a tube with higher power rating but if you want one as a pre-amplifier you want one designed for high gain and low microphony. For radio work, you almost certainly need a pentode for good results as they are more stable at higher frequencies.Is this a good choice?
Perhaps you mean the so called tetrodes and beam tetrodes. The other grid is basically a suppressor grid and the tube works "more or less" like a triode only. If you want power, they are the beasts to go after...
I want to experiment with loudspeaker amplifiers. I can't decide on what tube to use. I don't need high amplification, medium amplification will be good. And for price, I would like it to stay undel $20 for a tube.First define what you want the tube to do,
Just for experimenting, your best bet would be to find an old radio receiver in an antiques shop or a junk sale. It will not only contain a mix of tubes but it will have the power transformer and output transformers in it as well. You can probably buy a complete radio with four or five tubes, plus the other parts for less than the cost of one new tube. Start by getting the radio working, you might be surprised at how well some of them work after restoration.
Russia is one country still manufacturing vacuum tubes today.
These are brand new tubes, not something that is sixty years old and possibly damaged, broken, or worn out.
Some of these are direct copies of many familiar US and European part numbers.
Well worth a try, and the price is right. Also some of these are available on e-bay.
https://www.soviet-power.com/product.php?cat=116
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