I got the reply and there is propably something with Us being too low. It is taken from half of Ua = 280V. There is something wrong I think with diode you can see on board. The Ua is made OK but after the diode for Us there is only 115V. I attach the photo.
The diode I think is russian D226
The diode I think is russian D226
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Hi Guys
Vs sets the range for Vg1, so now that Vs=420V, you will need about -42V on the control grid as a minimum to keep the tubes under control. Before plugging in output tubes, assure that the bias range encompasses this value, and preferably can sweep to about -50 or -60 to assure full control over the tube.
Have fun
Kevin O'Connor
Vs sets the range for Vg1, so now that Vs=420V, you will need about -42V on the control grid as a minimum to keep the tubes under control. Before plugging in output tubes, assure that the bias range encompasses this value, and preferably can sweep to about -50 or -60 to assure full control over the tube.
Have fun
Kevin O'Connor
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