I've got a Pennrcrest, a very UGLY Penncrest. An all-gray plastic tube set. Very ugly. It has the strangest red, tends just a tad towards pink and that's as red as it gets. Yours is more attractive than mine. Everyone's is more attractive than mine which might win 'ugliest set'. Ugly, ugly. Seriously, I couldn't place a value on mine but if yours gives you pleasure, worth shouldn't be a consideration. I probably wouldn't use more than the force that comes out of the vacuum cleaner exhaust with a natural bristle paintbrush to loosen the dust. Any more'n that, you might risk damaging some of the filament-like wires that go to come of the exposed coil forms.