The heating pad thing is really more for chromatic harmonicas, and could help half valved diatonics as well, just a regular heating pad you might buy to warm up sore muscles. For a reg diatonic though that's most likely overkill, just warm them in your hands. And if your hands are cold, warm them with you armpits.LOL.
Maybe the climate here is so mild it’s not an issue with non-valved harps. I’ve taken to sitting my chromatic on my amp at the beginning of a gig, as I’m setting up and I switch the amp on. The P.T. gets quite warm and I’ve yet to have a problem with valves sticking. I only use the chromatic on one tune but I can’t see that lasting. There’s pressure to learn something more. Before I did this, I did find the valves would be quite rattly at first, and if I just put the harp away after playing I’d usually have problems next time. I took to using a toothpick or a split matchstick to prop the slider open and allow all chambers to ‘air out’ before I put it away. This practice was fine until one time I forgot to put it away and it sat on a table next to a north facing window (southern hemisphere). Next time I picked it up I found the comb was cracked badly enough that one chamber was not sounding. I didn’t make the connection with the sunny window at first. I was just perplexed. I put the harp away. When I next got it out, to my surprise the crack had closed and the harp played fine. I wondered if I’d dreamed the episode with the crack but on close inspection I could see there was a crack just where I remembered, just it was no longer gaping.
I still hadn’t connected the table/window/sun with what happened. That explanation came to me when I again left it on the table, picked it up in the evening and found the gaping crack had reappeared and the harp was again unplayable. This time I twigged the brass was expanding and had dragged the comb along with it. The comb was reluctant until it gave way at the weakest place, in the low Octave where it had been penetrated by nails on each side. Oh. Of course.
If you only play Diatonic harmonicas i can't see why you need to warm them up given that you will likely be pulling them out in a warm bar and/or your home. Valved Harmonicas are different beast so yeah they do require some added love...in my experience you just put them onto the top of your amp or even a S/S PA(it still gives out some warmth) It doesn't require overthinking.
I wrap my chromatic up in a hand towel or a couple of pieces or kitchen roll and put it on top of one of the central heating radiators. Take care it can get hot if you are not careful. If they are not running I warm it up in my hands, not as good though. Now all I have to do is learn how to play the thing.
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