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In Reply to: RE: B+ dilemma posted by Eli Duttman on July 16, 2014 at 11:27:06
Opps, you are correct. I did notice one other thing though.... it appears that the current limit is 0.5 milliamps at 450 volts. That would leave me quite a bit shy as I need 30 milliamps for each of two 6dj8's.
Am I misreading it again?
Edits: 07/16/14 07/16/14Follow Ups:
Hence the "supporting parts". You need a pass transistor. The LR8 sets the gate/base voltage. Try an IRF820.
Getting over my head now. Never have worked with any of that. Any schematics around showing how it's done?
You should probably use at least 1/2W resistors. Check their voltage rating.
Seems simple enough, but I will be using 60 milliamps of current for the two 6dj8 tubes in the phono pre. Will it handle that kind of current? My quick cdalcds on the resistors show they will have to be 10 watt units minimum to handle .060 amps.
Edits: 07/17/14 07/17/14 07/17/14
Voltage is dropped on the transistor, not the resistors. 150V @ .06A is about 9W so you'll need a big heat sink.
Won't this draw down the voltage on the line stage with that big a load?
It is linear, not shunting.
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