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 Post subject: Easy access color convergence panels ???
PostPosted: Nov Sun 05, 2017 6:24 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Monroe, NC 28112 USA
My 1976 Heathkit GR-371 color set had a convenient convergence panel behind the speaker. You released a latch and it flipped out. Were such arrangements common in the vacuum tube era?

Thanks,
Robert


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 Post subject: Re: Easy access color convergence panels ???
PostPosted: Nov Sun 05, 2017 9:24 pm 
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Location: New Hampshire
Zeniths either folded up from back top or were behind the SPKR that came out
with one screw. IIRC most Motorola also behind speaker.
IIRC all other consoles flipped up or you unscrewed it then put it in the service pos.
Portables mostly didnt. Just reach around & adj.
BTW many consoles also had places to attach the tuner & secondary controls on
the chassis for jig work. RCA & Zenith the best set-up. Made transport safe, easy &
more serviceable.

73 Zeno 8)
LFOD !


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 Post subject: Re: Easy access color convergence panels ???
PostPosted: Nov Sun 05, 2017 9:42 pm 
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Location: Monroe, NC 28112 USA
OK good feedback... So maybe not so many TV service men were cursing designs (for that reason anyway)...

All the best,
Robert


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 Post subject: Re: Easy access color convergence panels ???
PostPosted: Nov Sun 05, 2017 9:44 pm 
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I used to simply use a mirror for convergence and color bar adjustment.

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 Post subject: Re: Easy access color convergence panels ???
PostPosted: Nov Mon 06, 2017 1:16 am 
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Silvertones with RCA chassis had a set of screws on the rear of the cabinet. The convergence panel could be re-mounted facing the front of the set...

Same was true for the tuner assembly, there was a device and a screw hole to mount the tuner to the chassis for transport.

Back at the shop, the jig's yoke adapter got plugged into the yoke, the HV lead to the jig as well as the speaker and the essential ground return wire. The convergence panel was left to flop around at the bench :|


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 Post subject: Re: Easy access color convergence panels ???
PostPosted: Nov Mon 06, 2017 5:27 pm 
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Boy, that brings back memories! We all had those nice big mirrors with a tripod stand we stood in front of the set so we could do all the set ups from behind the set. Invariably a kid or dog or someone would accidentally kick the tripod and there goes the mirror!


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 Post subject: Re: Easy access color convergence panels ???
PostPosted: Nov Wed 08, 2017 12:12 am 
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Yep, I remember those days! Some of those old sets were a bear to converge and set up, and if you got good convergence out to the edges of the screen, you were doing very well.

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 Post subject: Re: Easy access color convergence panels ???
PostPosted: Nov Sat 18, 2017 1:44 am 
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I found a picture of one of these, belongs to a friend.
Have a close took at the image quality, geometry, colorimetry etc. And of course registration.

Not bad for a 45 year old TV.

CRT is 110 degree, too, nobody else got that kind of performance from 110 degree deltagun CRTs.


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 Post subject: Re: Easy access color convergence panels ???
PostPosted: Nov Mon 27, 2017 9:44 pm 
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Setchell Carlson had a tendency to place all service adjustments at the front of the chassis and have a removable cabinet panel to access them....It as a great scheme, but some sets placed the user hold controls on the back so when doing vertical height/lin setup (I know, not part of convergence) you had to go back and forth.

Remember there is also the static convergence....Which was a back adjustment on every set except the CTC-5 which used electromagnets.

Many early color sets in the 50's had removable/hinged tops to access everything easily.


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 Post subject: Re: Easy access color convergence panels ???
PostPosted: Nov Mon 27, 2017 10:32 pm 
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Yeah, I forgot about the static convergence... When building my Heathkit GR-371 I was terrified I would damage the rings, coils, etc. or that the plastic would break when I did a major tune up after the SCR flyback driver crapped out the second time.

Robert


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 Post subject: Re: Easy access color convergence panels ???
PostPosted: Nov Tue 28, 2017 1:26 am 
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Yeah, well we didn't get color in Oz until 1973, so we missed out on the tube color sets (except for a few imports). When color launched, retailers could sell every TV they could get their hands on and factories ran 24 hours, 3 shifts to meet the demand. It helped that almost all TV broadcasts on all the networks were in color from day 1.

This Kriesler was the TV that was recommended to friends by pretty much every service tech., even though it cost 6x as much as a B&W TV at the time. You can probably see why. Even the static convergence is on the drop-down front panel, and there are little switches to selectively turn off each color...
Most other TVs at the time were nowhere near this good. Philips was close.
Note the straight vertical lines and accurate linearity, right across the screen. To do this, this set had modulated S correction - the amount of S correction applied to the scan would vary with the position on the raster.


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 Post subject: Re: Easy access color convergence panels ???
PostPosted: Dec Fri 01, 2017 6:30 pm 
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In my early teens I decided to try and fix the color TV in the Bradford console stereo my mom had. Removed the CRT socket and a pin came with it so that ended the repair.

What amazed me was the sheer number of adjustments there was.


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 Post subject: Re: Easy access color convergence panels ???
PostPosted: Dec Fri 01, 2017 6:35 pm 
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Tube Radio wrote:

What amazed me was the sheer number of adjustments there was.


Early NEC tube color sets made for Pennys and Western Auto had the most - we always said that if NEC were to go bankrupt, it would be from buying trimmer pots. 4 Vertical adjustments - Linearity, "Top" (set the DC value above ground for the start of the sweep ramp), Height, and Hold range - these four in addition to a vertical hold control.

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 Post subject: Re: Easy access color convergence panels ???
PostPosted: Dec Fri 01, 2017 7:42 pm 
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Findm-Keepm wrote:
Tube Radio wrote:

What amazed me was the sheer number of adjustments there was.


Early NEC tube color sets made for Pennys and Western Auto had the most - we always said that if NEC were to go bankrupt, it would be from buying trimmer pots. 4 Vertical adjustments - Linearity, "Top" (set the DC value above ground for the start of the sweep ramp), Height, and Hold range - these four in addition to a vertical hold control.


Seems like this one had an adjustment for most everything.

Been so long that I've forgoten how many adjustments it had.


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 Post subject: Re: Easy access color convergence panels ???
PostPosted: Dec Sat 02, 2017 2:27 am 
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That was the problem with tube sets generally. You needed to provide for widely varying characteristics of the tubes. You either did it with lots of pots or you added extra complexity like negative feedback to move the dependencies to passive components. Trouble was, in those days, the passives weren't so stable either!
I've often pondered about the amount of work it used to take to keep 5 or 6 camera chains in a TV studio up to spec in those days.
Stuff I design these days has NO adjustments but is mind-numbingly more complex than things were then.


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