Usually i use a pair of them...
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Still have my first amp - a 1961 Silvertone - that I got from my parentd around 1974:
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Still works, but man have amps come a long way from this....thankfully.
I did use it on a 2011 recording - along with a 1968 National Triolian Resophonic Resonator - and the sound is almost eerie....
You can hear the 1928 National Triolian Resonator and this amp at the end of this radio station ID spot I recorded back in 2011:
https://soundcloud.com/robert-h-herndon/electric-blues-radio-station-id-spot