Hi,
I am looking at a fender princeton reverb II, it needed a retube and I redid all the electrolytics caps.
But there must be something else wrong, something in the bias arrangement keeps overheating.
http://www.stratopastor.org.uk/strato/amps/prii/schematic/schematic.html
Could somebody explain the 2x 390ohm resistors in the bias ?
I replaced it with two parallel 1K8 1K5 1W resistors.
But they overheat with all the tubes out.
There's a drop of 50V over 780 ohm, thats 0.064A, so 3,2Watt ?
Is this underdesigned, or am I getting it wrong?
I am looking at a fender princeton reverb II, it needed a retube and I redid all the electrolytics caps.
But there must be something else wrong, something in the bias arrangement keeps overheating.
http://www.stratopastor.org.uk/strato/amps/prii/schematic/schematic.html
Could somebody explain the 2x 390ohm resistors in the bias ?
I replaced it with two parallel 1K8 1K5 1W resistors.
But they overheat with all the tubes out.
There's a drop of 50V over 780 ohm, thats 0.064A, so 3,2Watt ?
Is this underdesigned, or am I getting it wrong?
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