#271
|
||||
|
||||
Don't have a 415, but I do believe I have all other necessary equipment. Bear with me here, this is my first IF alignment on a color tv. I've been lucky I haven't had to do any till now.
__________________
Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
#272
|
||||
|
||||
I like Bill R's suggestion of setting up to do a video IF alignment and viewing the traces to judge whether alignment is a significant problem. That is, look -- following the procedure in the factory manual -- but don't touch any adjusters the first time around.
If you haven't done the procedure before, that would also give you confidence that your setup is correct and you are viewing valid things on your scope. Phil Nelson Phil's Old Radios https://antiqueradio.org/index.html |
#273
|
||||
|
||||
The alignment instructions for this seem pretty involved! Don't know if I am quite up to the task yet... Can anyone lead me in the right direction? If push comes to shove I'll just try and build a video preamp.
__________________
Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
#274
|
||||
|
||||
Do you have a restored B/W set that works well, that you could use to practice alignment (again, doing the setup and looking at the traces, without changing adjustments)? The setup wouldn't be identical, but maybe that would help you get the hang of things.
I had reached a similar point with my CTC-4 and I took a stab at building a video preamp, which turned out to be not as simple as I hoped. This old thread has more details: http://www.videokarma.org/showthread...259995&page=23 The last color bars that you posted look pretty good, apart from that one anomaly. What does the TV look like when you view regular content, such as a DVD or cable TV? Sometimes things that look less-than-perfect in test patterns don't interfere much with everyday viewing. Phil Nelson Phil's Old Radios https://antiqueradio.org/index.html |
#275
|
||||
|
||||
Quote:
__________________
Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
Audiokarma |
#276
|
|||
|
|||
As Phil suggested, practice alignment on a BW set. You don't wanta jump on a full dress Harley without being proficient on a more basic bike.
|
#277
|
||||
|
||||
Regarding a video preamp, I just updated my CTC-4 article with a new section at the end, describing what I built:
https://antiqueradio.org/RCACTC-4ColorTelevision.htm My preamp didn't work, due in part to a wiring mistake. I fixed that and messed around a little more, and then pushed the whole thing aside because I was burned out on the project. Anyhow, I have to believe that the basic design, taken from the 1956 article in RCA Broadcast News, will work if someone takes the time to build it correctly. Phil Nelson Phil's Old Radios https://antiqueradio.org/index.html |
#278
|
||||
|
||||
Quote:
__________________
Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
#279
|
|||
|
|||
...
Last edited by andy; 11-18-2021 at 05:03 PM. |
#280
|
||||
|
||||
Quote:
__________________
Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
Audiokarma |
|
|