Well, thanks !!!The only problem with that is that Gurus are required to wear a towel wrapped around their heads, sleep often on a nail bed but, worst of all, weigh around 40Kg.In that case, either I am 60Kg over limits *or* I should be properly called "Oh 2 1/2 Gurus". And , even worse, Gurus are strict Vegetarians, can´t eat "asado"(BBQ) or "choripán" (coal grilled spicy sausage sandwich). No way José. !!
You already *have* one ... it's the Lamp brightness.Normal is dark orange, red or almost invisible; a shorted amp is bright shining as if it were connected to illuminate the room, it will usually blink in rhythm with the music.
So you replace both transistors but you don't yet know if that's the fix.
I'll just make a couple comments here. Regarding the level of bulb brightness, I have found that different amps draw more or less current while "idleing" causing the bulb glow a little brighter or dimmer. Second, to prevent a situation like JM described always use a variac to bring the voltage up gently. If the amp is drawing excessive current you'll see it before you raise the V to high.
Tom, Yeah that's how I've always done it. You'll know right away by the brightness of the bulb if excessive current is flowing.
Which one first though - I was earlier thinking Varic first - but now, thinking about it the Bulb first would seem to make more sense... or does it on matter?
Quote from: noddyspuncture on April 20, 2012, 07:09:37 AMWhich one first though - I was earlier thinking Varic first - but now, thinking about it the Bulb first would seem to make more sense... or does it on matter?It may not matter, but I would put the Variac first, then plug the Light Bulb Limiter into that, and the project amplifier into the limiter.