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  #33  
Old 06-24-2024, 11:07 AM
Yamamaya42's Avatar
Yamamaya42 Yamamaya42 is offline
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Join Date: Nov 2018
Location: Round Rock TX
Posts: 3,180
So, the to-do list for my FADA is...

Fully replace the suspect candohm resistor with new power resistors with ones as close as I can get.
The main large one is still OK and will be left alone.

Replace the 270pf caps in the video IF that I left in there, I did get them 4 years ago, Mouser #598-CD15FD271JO3F, just did not put them in, I'm sure they are still around someplace, I hope, they have come up $1 in the last 4 years,

Re-check original resistors that were OK last time, any drift out of tolerance ?

Increase electrolytic capacitor in audio output area (20uf now), one of the problems seen was shrinking horizontally in relation to the audio when the sound was turned up rather high, may also add a bit more capacitance to the pi filter circuit.

Address the annoying damper heater issue, once in a blue moon when turned on the damper won't heat, and a slight wiggle gets it working again, then it's fine for weeks and weeks again, most likely a poor connection.

And lastly, alignment attempt, I CAN tune in stuff, but it is very picky, fussy, the 270pf caps will most likely help with this, but sound and video are still very hard to get matched up, as mentioned before, and I did start this with one IF coil broken off, so the fact that it is working as well that it does now is rather lucky, I just hope it's not TOO hard to align with just an rf generator.
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