Hello
I hope I didn't miss an introduction thread. I'm new here and my name is Tom, living in Switzerland and relaunched my interest in Tube Amplifiers after a break of more than 20y.
In this process I try to understand this published SRPP PreAmp (SRPP-Vorverstärker)
My two question refer to the high voltage power supply shown in pic. 1a
1)
R135, R136 and R137 as TL783 adjustion seem to deliver more than 350V. I would rather more use R135: 10k and R136: 82k .
2)
With R129; 4k7 I would expect around 340V but not 310V.
I'm pretty much sure I missed something, but I don't see the clue. Any ideas?
Thanks
Tom
I hope I didn't miss an introduction thread. I'm new here and my name is Tom, living in Switzerland and relaunched my interest in Tube Amplifiers after a break of more than 20y.
In this process I try to understand this published SRPP PreAmp (SRPP-Vorverstärker)
My two question refer to the high voltage power supply shown in pic. 1a
1)
R135, R136 and R137 as TL783 adjustion seem to deliver more than 350V. I would rather more use R135: 10k and R136: 82k .
2)
With R129; 4k7 I would expect around 340V but not 310V.
I'm pretty much sure I missed something, but I don't see the clue. Any ideas?
Thanks
Tom
With an average Vref=1,27V the resistors as mentioned in the schematic are allmost right for the 340V.The values you propose are more on the save side.In this process I try to understand this published SRPP PreAmp (SRPP-Vorverstärker)
My two question refer to the high voltage power supply shown in pic. 1a
1)
R135, R136 and R137 as TL783 adjustion seem to deliver more than 350V. I would rather more use R135: 10k and R136: 82k .
If there is no current, yes.But if the circuit on terminal 320V draws somewhat like 6mA and the divider, for elevating the heaters, 1mA you loose 7x4k7= ~30V from 340V.2)
With R129; 4k7 I would expect around 340V but not 310V.
Mona
- Status
- Not open for further replies.