|
|
|
#151
02-07-2021, 12:25 AM
|
||||
|
||||
|
well, i got it downstairs!
 https://i.imgur.com/ankW5nV.jpg I still have to go through the entire setup/ convergence with it, but it's in it's final location. You can REALLY see that it has an set of LEDs for the channel number indicator. :p
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために 
|
|
#152
02-08-2021, 11:49 PM
|
||||
|
||||
|
I probably have a weak damper, It's still the Original tube that came with the set, and I'm surprised it still works at all.
The HOT and HV rect have been replaced already. I am seeing some changes in width and focus as i turn brightness up and down , so I will see what a new damper does. there were 2 choices for HOTs in this set. https://i.imgur.com/M0UzLQc.jpg it came with an original GE 6JS6A which looked very tired, I have a 6HF5 in it now that someone claimed tested at %98. which i have been running for 3-4 months now. just on a lark, I put the old tube back in, it came on for 40 sec, shorted out, and blew the breaker, new tube back in and working, YUP, tube was worn out!
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
|
|
#153
02-09-2021, 02:48 PM
|
||||
|
||||
|
Quote:
This set, like all RCA types up to the CTC-16 line has damper power pulled from the secondary vert output xfomer, at the vertical centering POT, (400v in this set ). The fact that I see almost no change in vertical height, and the fact that the damper is as old as the set makes me very suspect of it.
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
|
|
#154
02-09-2021, 09:38 PM
|
||||
|
||||
 Well rats... tried to do a basic convergence on it and found a broken coil, the core is broken in 3 pieces, and the paper tube is ripped, someone made a big mess of it, I DID find a replacement. edit well pics do say a lot https://i.imgur.com/d2JYqXT.jpg https://i.imgur.com/msdSFRu.jpg And I did confirm that HV does drop down when brightness is turned up, even with the cap off the shunt regulator.
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために Last edited by Yamamaya42; 02-09-2021 at 10:24 PM.
|
|
#155
02-10-2021, 10:47 AM
|
||||
|
||||
|
What I don't get with this silly GE clone is, it all seems virtually identical to the CTC-15/16 with only minor differences except for the horizontal circuit, which is quite different, not sure why this was done, copyright/patent issues?
If so, why not for other areas of the set?
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
|
| Audiokarma |
|
#156
02-10-2021, 11:15 AM
|
||||
|
||||
|
Maybe just a matter of timing. When you need to sell sets, go with what you've got.
|
|
#157
02-10-2021, 08:34 PM
|
||||
|
||||
|
https://i.imgur.com/qb5up6h.jpg
all 5 of my vintage sets on the same feed!  I'm now ready for the savage cold front that is headed here next week, that is, if the power does not go out 
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
|
|
#158
02-10-2021, 10:22 PM
|
||||
|
||||
|
What is the white one on the left?
|
|
#159
02-10-2021, 10:49 PM
|
||||
|
||||
|
Quote:
stromberg carlson x-21 "m4b" was in horrid shape when i got it https://i.imgur.com/DzWYsx1.jpg https://i.imgur.com/LeBQKOI.jpg left in a barn to rot, 1/3 of the wood was ruined on it EDIT-- I did my best with 2 weeks of scraping, sanding, wood-filling, priming and painting and replacing rotted bits to get it to look ad best as I could, it is a shame they let it go like that. BUT,, If i ever find someone selling a cabinet like one of these... and I have the $$$ ! https://www.worthpoint.com/worthoped...lson-132744289 but the chances are VERY unlikely
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために Last edited by Yamamaya42; 02-10-2021 at 11:15 PM.
|
|
#160
02-20-2021, 06:40 PM
|
||||
|
||||
|
Well, the new damper did not help at all with the problem, HV still changes a lot when I adjust brightness , HOT is new, damper is new HV rect is new, I am going to replace the shunt regulator , but I doubt it will fix anything, I will most likely have iti pull it apart and replace the 1.5 meg resistors in the HV regulator circuit that many say is a problem in these sets, I did NOT have to mess with that in my RCA CTC-16XL, but obviously GE uses crappy parts. The most annoying thing is as the HV drifts, so does the focus.
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
|
| Audiokarma |
|
#161
02-20-2021, 11:57 PM
|
||||
|
||||
|
OK, now I'm curious.
using the CTC-16-XL schematic as reference. https://i.imgur.com/VgMbCbL.jpg the HV Rect circuit is the same as the CTC-15/GE except for one thing, the red X es are the resistors i intend to replace to try to get HV regulation stable. the circles are the difference in the 15- > 16 in the 16, the 1 k ohm resistor off the shunt cathode goes directly to the bias point (390v), in the 15, its tied to the same source as the damper, which goes up to the green wire in the vert output transformer, which has an indirect link to the bias point via the centering pot, etc. any clue why they changed this for the 16?
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
|
|
#163
02-21-2021, 09:07 PM
|
||||
|
||||
|
Quote:
this is the 15/ge https://i.imgur.com/ODgSryy.jpg as i said, I'm replacing the 1k on the cathode and the 2 "matched" 1.5m with 1%
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
|
|
#164
02-22-2021, 09:20 AM
|
||||
|
||||
|
This is just pure speculation here, as I still do not fully understand how the HV regulator works on this, but after looking at the CTC-15/GE &16(which is almost identical ) , I seem to have a general understanding.
The 6bk4A/B/C regulates by shunting power via the cathode through a 1k resistor to what ever the damper gets it's bias from, SAMs does not say what wattage, I assume to be 1W. The grid of the 6bk4A/B/C is tied to a 1.5 meg resistor voltage divider ( matched pair) , one to the HV control pot & coupling cap to cathode. ( very low suspect ). The other resistor is hooked to the FBT winding that goes to the Horz yoke windings, thus there is strong pulses there, this ALSO goes up to the RGB drives, and later video output, and so on, therefore, if these resistors are out of tol, especially the pair of 1.5 meg, it would explain the odd behavior seen when changing brightness, and why I have seen people say to pay attention to those resistors in particular.
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
|
|
#165
02-22-2021, 01:29 PM
|
||||
|
||||
|
I would not have thought it was so hard to get 1.5meg resistors @ 1w,
this was the only ones that Mouser had that I did not have to buy in lots of 100. :O 588-OM1555E-R58 getting 5 of them, should not be too hard to find a good match from that, especially when these are of a higher tol than what is in there now.
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
|
| Audiokarma |
 |
|
|
Linear Mode
