Got a question: I recently completed a Class A single ended amp kit from a reputable dealer. The first time I fired it up the tone was geat but I could hear an intermittent crackling noise from the speaker. Knowing of the dangerous voltages and that I probably had a bad solder joint, I emailed the dealer and he recommended running the amp until the tubes were hot, then unplugging the amp from the wall outlet while leaving the standby and on/off swithches in their on positions. Said the hot tubes would act as a load on the filter capacitors and would drain the voltages. Just wondering what y'all have to add to this, and more importantly, does this technique work with all tube amps or just single ended Class A types?