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? With my 106 at minimum amplitude I get Vk = -6.4 V, Vg2 = 0 V, Vg1 = SW roughly between -7 V and -22 V, output SW between 0 V and -0.2 V (at 50R) or -2 V (unterminated).
5) Between Pin 2 and (top of) R55 is the voltage drop across R55 and equals -Vgk, not that -151 V. The average value of Vg in my case was about -15 V, so Vgk about -8.5 V on average.
May I ask again whether or not Vk (= "A") can be varied with the Amplitude knob to at least -150 V or so?
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
toggle quoted message
Show quoted text
On Thu, Mar 3, 2022 at 02:38 PM, Stephen wrote:
David, Albert,
I rechecked the voltages, this time with the correct settings, and they are
still exactly the same.
I also checked all the waveforms to be expected on the ¡°GENERATOR¡±
schematic.
All waveforms are perfect until I get to R99 (600¦¸). From this point and
everything beyond (to the right), zilch. Flat as a pancake. Which was to be
expected since there is no output.
Q54 is fine. For good measure I replaced it temporarily. Same results.
Although the TP voltages are all fine, I¡¯m seriously considering recapping
the power supply¡ again.
At this point, I don¡¯t know what else to do.
What do you think?
