Bias Circuit Help
Posted: Tue Sep 13, 2016 4:11 am
Hi all,
I'm hoping someone can help me with some issues I'm having with a build i have just completed.
I have built myself a BE50, based on photos and a schematic i found online.
The issue i have with the bias circuit is that the original BE100 uses a PT with a dedicated bias tap of 100v (according to Phil at Heyboer).
The 50w PT i am using does not have a dedicated bias tap so i need to take the bias from the B+.
So basically i need some help with the maths so i can work out the bias output to the tubes with an input voltage of 100v to the bias circuit.
Then i need to work out how to get that same output with an input voltage of 350v.
Im sure when someone shows me i will feel like an idiot, but i have not had to do this kind of maths for years... since trade school really.
Any assistance is much appreciated.
I'm hoping someone can help me with some issues I'm having with a build i have just completed.
I have built myself a BE50, based on photos and a schematic i found online.
The issue i have with the bias circuit is that the original BE100 uses a PT with a dedicated bias tap of 100v (according to Phil at Heyboer).
The 50w PT i am using does not have a dedicated bias tap so i need to take the bias from the B+.
So basically i need some help with the maths so i can work out the bias output to the tubes with an input voltage of 100v to the bias circuit.
Then i need to work out how to get that same output with an input voltage of 350v.
Im sure when someone shows me i will feel like an idiot, but i have not had to do this kind of maths for years... since trade school really.
Any assistance is much appreciated.