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I have a 1932 cathedral that as found (all original except for the 40's lytics tacked in parallel with the originals) 2-3 years ago ran on it's original caps...Albeit with weak reception and audio distortion. It used all block caps for it's paper types. Re-stuffing the blocks brought it back to being a strong performer.
I don't own a heat gun, and have not encountered a block with one of the harder potting materials that, I seem to recall reading, were made so the chipping method is the easiest means at my disposal....The tar is so soft a little bit of pressure will sink the blade of a flathead screwdriver a surprising distance into it...
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