#16
|
|||
|
|||
Sandy, you are close but not 100% right. Consumer electronics is supposed to last about a week after the warranty has expired.....
|
#17
|
||||
|
||||
Why isn't UHF of use now? Our OTA NTSC station is Ch. 39.
My agile modulator goes up well into the UHF OTA range, and using it to broadcast in the house OTA is a lot more convenient at UHF. For example, I can watch TV (not just HSN on 39) on my balcony using UHF on any of my portable TVs, or out in the yard on my battery color portables (a modern RCA NTSC/ATSC set, or the Indextron (which will run on batteries) ). ATSC does not work below the balcony unless I'm out at the boathouse. (Our faux upscale apartment complex has a lake and "boathouses", really just gazebos.) P.S. ... the CT-100 works quite nicely at UHF. |
#18
|
|||
|
|||
When analog TV went away in 2009, all of the television stations' frequencies were scrambled up. The three main stations in Atlanta: 2, 5 and 11 retained their numerical channel designation, but were all shifted into the UHF range. Oddly, our educational station, channel 8, remained at that frequency.
So the UHF frequencies are definitely being used. It's just their format has changed to digital. |
#19
|
||||
|
||||
There are fewer low power NTSC channels on the air. I have not known of any in my area in the last 2 years (aside from the VHF ones I broadcast). Now that analog cable is gone in my locale I'm going to have to put a modulator or two on UHF sooner or later. I've always kept my modulators on VHF so my pre-1964 sets could all tune them.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#20
|
||||
|
||||
Glad to help, as I had nothing to put it in.
That old shop had this AX left and that CYP so I grabbed both and passed them along to those who need them.. That Arliss model was the perfect candidate!
__________________
"When resistors increase in value, they're worthless" -Dave G |
Audiokarma |
#21
|
||||
|
||||
Quote:
With NTSC being extinct in our area, I wish it was all on UHF. We STILL need bigger VHF antennas and broadband combos that are even larger: sigh: making our rooftop antennas very obvious.
__________________
"When resistors increase in value, they're worthless" -Dave G |
#22
|
||||
|
||||
CTC-5 was looking great until it blew the horizontal sweep output fuse tonight and I lost HV. Fuse is a .300 amp 250 volt C type. Assuming it is not a slow blow fuse, correct?
Now I am really gonna leave it be until someone more knowledgable than me can run some key diagnostics to make sure the set is running ok. Anything obvious I should look for that may have caused this? Figures!!! Just got the convergence all set up!
__________________
-Al |
#23
|
||||
|
||||
Another pic
__________________
-Al |
#24
|
||||
|
||||
Quote:
It is also wise to look at the H osc. waveform on a scope to make sure it is correct, and check the grid drive of the H output tube before the current dip to ensure the tube is being driven properly.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#25
|
||||
|
||||
Quote:
__________________
-Al |
Audiokarma |
#26
|
||||
|
||||
Leave fuse out. Amp meter completes the cathode connection.
Usually you also put a cap ( .01 IIRC ) across the meter too. 73 Zeno LFOD ! |
#27
|
||||
|
||||
Most procedures I've read call for a .47 cap, but in my experience the cap usually don't make a difference.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#28
|
||||
|
||||
Thanks fellas!
__________________
-Al |
#29
|
||||
|
||||
CTC-5 update. Got a beefier variac and a few replacement fuses for the horizontal sweep output circuit. Powered the set back up at 115 volts and measured the current on the horizontal circuit. Was reading 230 mA. I hear it should be around 190. So need to adjust the horizontal efficiency coil. However, the coil is frozen up solid. Need to pull the chassis and try hitting the coil with a hair dryer or heat gun to free it up so I can properly adjust it.
Also need to figure out a way to secure one of the dynamic convergence control pots to the chassis. The locking tabs that did secure the pot were broken off and the pot just hangs by its wires. Makes it virtually impossible to adjust while set is playing. IIRC, it is the blue gun control (Tilt and Amp). Will work on these two issues over the next few days.
__________________
-Al |
#30
|
||||
|
||||
6CB5's cathode current AND high voltage varies with brightness. Checking cathode current on 6BK4 (850 microamps) is part of the procedure. If you adjust the HV for 24 kV(?) and the current at 6BK4 falls below that value, the eff coil needs readjusted. Lots of interaction.I'll check my library of RCA stuff to see the exact procedure and email it.
Hopefully the eff slug was not adjusted with a metal allen key, which splits it, requiring very careful removal by hand, using a drill bit.
__________________
"When resistors increase in value, they're worthless" -Dave G |
Audiokarma |
Thread Tools | |
Display Modes | |
|
|