I was wrong! You absolutely do need to modify the socket wiring to use EL84.
Some EL84 datasheets show pin 6 as IC instead of NC.
Tek wired the V64/74/84/94 screen grids using both pins 6 and 9. If 6 in your tube goes to anything but G2, it won¡¯t work to say the least.
Take the wires going to pin 6, and connect them to pin 9 instead.
Sorry,
Dave Wise
From:
[email protected] <
[email protected]> On Behalf Of Stephen via groups.io
Sent: Thursday, March 03, 2022 5:38 AM
To:
[email protected]Subject: Re: [TekScopes] Type 106 Saga (Again)
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?
