On Thu, Mar 3, 2022 at 04:02 PM, Albert Otten wrote:
Interleaved.
Stephen,
If the voltages (at the EL84 pins) are still exactly the same, do you mean as
in a previous message? Let me recall:
2- Pin 6: +3V
3- Pin 7: +1.6V
4- Pin 8: -4.7V instead of -145V
5- Between Pin 2 and R55: +3V instead of -151V
At pins 6 and 7 you measure Vg2 and Va. How can these ever be positive? Did
you perhaps not measure w.r.t. GND?
Yes I definitely did measured referenced to chassis ground.
With my 106 at minimum amplitude I get Vk
May I ask again whether or not Vk (= "A") can be varied with the Amplitude
knob to at least -150 V or so?
I don¡¯t think so, but I¡¯ll check again later.
What I can tell you, however, is that when I connect a scope to the Fast-Rise output, the flat signal (AC coupled) goes down when the intensity knob is turned up, and up when the intensity knob is turned down¡
About pin 6 just to be sure: are pins 6 and 9 internally connected in the
EL84? See also a remark by David who thinks no modifications are needed.
Philips labels "i.c." at pin 6, which means do NOT connect this pin to
anything.
Albert
I understand what David is saying, and I¡¯m also going to respond to him here.
David, all of the EL84 pinouts I¡¯ve checked refer to pins 1, 6 and 8 to be internal connections.
However, what greatly confuses me is that the unit was perfectly working before WITH pin 9 entirely disconnected, and pin 6 connected. The unit had no modifications whatsoever, as if it were running with 7189A¡¯s without modifications¡. I don¡¯t get it.
But I will do the modification before I do anything else.
I will report back as soon as I can.
