Thank you Salas (Nick!).
Another question for the transformer in your example. AS-0532 is the minimum to use for bipolar 30Vdc regulated output?
I thought 28Vac rectified is about 39.5 Vdc and should be enough?
Another question for the transformer in your example. AS-0532 is the minimum to use for bipolar 30Vdc regulated output?
I thought 28Vac rectified is about 39.5 Vdc and should be enough?
It depends on how high the Tx goes at this load. Its less than x1.41 DC due to bridge Vf and ripple losses but its also more than nominal AC due to less than nominal secondary current load. 28V Tx could work well but I said 32V just to make sure. Even if mains are low in a place.
Salas I don't know if it's answered but I'm looking to know R303 value for 6.3Vout?
I guess something between 220R & 1K8 right?
I guess something between 220R & 1K8 right?
For 6.3V voltage region, use R103(303) jumper D101(301) Jumper Trimmer R105(305) 1k
What's your best reg. to use for grid bias isn't for high voltage it's for 7N7 or 5687 tubes so a maximum of -10V and minimum -2V could be ok , also what's better to use the negative or the positive version of the reg.?
TIA
Felipe
TIA
Felipe
Negative section of course but -2.5V minimum with BJT output option. Nevertheless using a shunt reg for negative grid bias seems overkill. Did you try using a battery first?
*Battery is floating and its isolation is a better bet for achieving low noise than to put some mains fed and earth referenced electronic PSU directly to the control grid.
Can't reach the bias I want: 9mA 150V at anode -3V grid. As you can see I use Ale Moglia hibryd mu-follower as anode load. If I set the hibryd mu-follower to 150V at plate the current increase till 15mA.
What do you think of schematic used for battery, some people connect the battery between the 1Meg grid leak resistor and ground?
What happens Salas: Gyrators, CCS, hibryd mu-followers so active loads doesn't work well with battery bias?