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Recent content by Rustyroadie

  1. R

    Simple POT question

    Thanks for the reply's, I will post the circuit when I get a chance.
  2. R

    Simple POT question

    Hi there, I am building an amplifier from an old circuit which calls for some 50K Linear potentiometers to be used for the EQ section. I am having difficulty finding 50k linear pots with a splined shaft to suit my knobs. Would I be able to use 100k pots and just put a 100k resistor across the...
  3. R

    Power Supply Help...

    Gents, I seem to have come right...a leaky cap!! Thanks for all the help, it's much appreciated. I'm wiser (and slightly balder) now. TA
  4. R

    Power Supply Help...

    My mistake...it's 200mA for the power supply of the whole pre-amp, not the HT for the valve. The 80V is a floating winding on the transformer, and the ground is tied to the lo-voltage ground after rectification and smoothing. Thanks for the advice, I'll start right from scratch and work...
  5. R

    Power Supply Help...

    Magnetron, I have taken the 4k7 resistor out all together, it doesn't seem to make any difference. And if I lower the 100k value, the voltage drops right down to a few volts, and if I put in a higher value, it doesn't really have an affect. Leaving out the 4k7, and using the 100k bias resistor...
  6. R

    Power Supply Help...

    Thanks Magnetron, thats a great help. I'll let you know how it goes...
  7. R

    Power Supply Help...

    Thanks for that, I'll try lower values, the schematic I have uses those values, but is quite possibly wrong ;)
  8. R

    Power Supply Help...

    Hi, Greetings! new memeber here, glad to have found this forum... Anyway, could anyone shed a bit of light on this? I am constructing a guitar amp from some old schematics, and a few half built pcbs...Im having a bit of a problem with the HT power (used for the tube). I have an AC...
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