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Hi all,
After a little hiatus to learn the names of the strings on my guitar and occasionally playing them in the right order, I'm back on the iron.
A friend of mine has asked me to fix the buzzing and popping on her Bassman 135. On opening it up, the first thing I notice is that the Mallory caps all have original 1979 date codes. So I have replacements on order.
But something puzzles me. The cathode bypass caps are rated at 25v or 50v (on diagram and as built) , yet the voltage indicator (on diagram) at each of the cathodes is 1.9v. Knowing Leo's propensity for all things inexpensive (and that gain stage bias is rarely more than 2 or 3v) , why do these caps have such a high voltage rating?
Many thanks
Jeff
After a little hiatus to learn the names of the strings on my guitar and occasionally playing them in the right order, I'm back on the iron.
A friend of mine has asked me to fix the buzzing and popping on her Bassman 135. On opening it up, the first thing I notice is that the Mallory caps all have original 1979 date codes. So I have replacements on order.
But something puzzles me. The cathode bypass caps are rated at 25v or 50v (on diagram and as built) , yet the voltage indicator (on diagram) at each of the cathodes is 1.9v. Knowing Leo's propensity for all things inexpensive (and that gain stage bias is rarely more than 2 or 3v) , why do these caps have such a high voltage rating?
Many thanks
Jeff
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