|
|
|
#1
06-06-2013, 01:23 PM
|
||||
|
||||
|
1963 Zenith 19" b/w (16K27 chassis)
This is the tv that BigDavesTv picked up for me from ElectronicM at the ETF convention. Usually these Zeniths don't need much, but this time there were 3 separate problems with the vertical.
1. The sync wouldn't lock for H or V, this was R58 on the schematic, same exact problem I had on another set with the same chassis a few months ago. 2. Not enough Vert size, turned out to be caused by that K2. I replaced K1 as well even though it was ok. 3. The vertical would increase in size as the set warms up until it gets too much and the vert linearity is way off. This stumped me for a while, I was convinced it was caused by a resistor, after I had eliminated all the possible resistors I even tried swapping in another yoke and vertical output transformer, but the problem turned out to be caused by the tube itself. After I had tested the tube (and also tried swapping in another tube) eliminating it as the cause of my problem #2, I had ignored it as a possible source of this problem. A new 6EA7 fixed it up. other problems: 1. The brightness control needed to be replaced. 2. The buzz control was dirty. 3. Weak sound was caused by 6BN6 tube not making contact in its socket. stuff it still needs: 1. The shaft on the volume control is bent, but it works good, so I left it. 2. Missing antenna 3. The channel number won't focus in center of tuning control. I remember reading a post here that these needed a certain bulb, anyone remember what kind it is? Pics below... Last edited by Adam; 06-04-2016 at 12:09 AM. 
|
|
#2
06-06-2013, 02:02 PM
|
|||
|
|||
|
Gotta love that first picture. Wow.
|
|
#3
06-06-2013, 02:46 PM
|
||||
|
||||
|
IIRC you have to bend the lamp around to get the number to
the center. Used to have the SC model of this set. One of the best sets built by anyone anywhere at any time. They were coming in well into the 80's & always had perfect jugs. 73 Zeno 
|
|
#4
06-06-2013, 09:09 PM
|
||||
|
||||
|
Nice job you've done on it.
Glad you are getting more enjoyment out of it than I did.
__________________
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
|
|
#5
06-06-2013, 09:56 PM
|
|||
|
|||
|
IIRC, the correct lamp was a #239 lamp.
|
| Audiokarma |
|
#7
06-07-2013, 04:21 PM
|
||||
|
||||
|
I've been collecting these metal cabinet zenith b/w's. From left to right in the pictures: 1963 and 60 space command 300 sets, a 67 and this 63, a 61, a 66 with the SC300 remote, and a 23" from 1971. (And the '71 is sitting on a 1962 23" console also with the SC300)
With both this one and that 67 next to it, where the channel number shines through the center of the dial, I've tried bending that light holder all over the place and could never quite get the number all in focus and in the center on the dial at the same time. Last edited by Adam; 06-04-2016 at 12:09 AM.
|
|
#8
06-07-2013, 08:57 PM
|
||||
|
||||
|
I was using the crosshatch pattern on this old RCA color bar generator when I was looking at the linearity on this set. I just had to swap out the electrolytic caps in it, but going this long on all original parts for a unit made in '65 I would say was pretty good. It's this unit you can see hooked to my CTC-9 in the picture up there ^
Last edited by Adam; 06-04-2016 at 12:09 AM.
|
 |
|
|
Linear Mode
