I remember one tech worked to save a very old RCA 20" tv that had
VIPUR IC die and got bypassed with STR30xxx regulator and isolator
transformer, add external standby power supply.

Now, I wondered if others had done this except take a desireable
chassis and "improve" on it with designs to key areas that can bear
improvments with nice ideas from other chassis even from other
brands'.

For example: Take a JVC chassis, take out their audio amp and put in
better amp on seperate board tapped into audio from chassis and use
four speakers one for lows & mids and tweets for the highs. Fix the
lousy HV regulation with idea based on CTC169 projector HV boost or
one like the TX826 chassis which is outstanding idea of HV regulation
by modifying the horizontal pulses and is fed by raw DC without
regulator. Etc.

Also is there a way to massage the video signal so not to make over
driven images to rid of sparkles & comets?

Your choices of desireable chassis and ideas on modifying the chassis
too.

So on...

Cheers,

Wizard

On Thu, 11 Mar 2004 03:54:00 GMT, (Jason D.) wrote:

I remember one tech worked to save a very old RCA 20" tv that had
VIPUR IC die and got bypassed with STR30xxx regulator and isolator
transformer, add external standby power supply.

Now, I wondered if others had done this except take a desireable
chassis and "improve" on it with designs to key areas that can bear
improvments with nice ideas from other chassis even from other
brands'.

For example: Take a JVC chassis, take out their audio amp and put in
better amp on seperate board tapped into audio from chassis and use
four speakers one for lows & mids and tweets for the highs. Fix the
lousy HV regulation with idea based on CTC169 projector HV boost or
one like the TX826 chassis which is outstanding idea of HV regulation
by modifying the horizontal pulses and is fed by raw DC without
regulator. Etc.

Also is there a way to massage the video signal so not to make over
driven images to rid of sparkles & comets?

Your choices of desireable chassis and ideas on modifying the chassis
too.

So on...

Cheers,

Wizard

You've gotta have a good background in theory to do deep fixes like
that. There are many here who can help you though.
I remember my dad doing just that many years back in his repair shop.
He could take scraps of old sets just lying around and cobble tthem
together to make very respectable working sets.
My favorite tv when I was growing up was parts put together in an old
metal box Wizard chassis.
Dad had put all kinds of pots on the top of that square box for
everything from vert./hori. stability to basic yoke adjustment.
It produced a first rate picture for all of the time I used it growing
up.
It was still working when my step mother tossed it out to turn my old
room into a office.
That old set would probably be worth something to collectors today.
Metal simulated woodgrain finish case with glass front. 20 inch tube
with those really retro looking tuner knobs and a bottom grill with
dual speakers. all this set on tall furniture legs with a yellow/gold
chrome wire basket shelf underneath for the obligatory tv guides
etc...
You'll find someone here that'll assist you in building your ideal set
tho'.

Jason D. ) writes:
I remember one tech worked to save a very old RCA 20" tv that had
VIPUR IC die and got bypassed with STR30xxx regulator and isolator
transformer, add external standby power supply.

I don't think you're going far enough back.

People were probably making tv sets as soon as there were tv signals.
This would date to the days of various experimental schemes, who can
forget the neon bulb and rotating wheel?, but of course would become
less experimental once regular broadcasting started.

Since there were few or no commerically made TV sets circa 1939,
the only way the average person could see the broadcasts from the World's
Fair that year was by building a TV set.

I've heard that the hobby magazines carried construction articles then
or a bit later.

And it's immortalized in Robert Heinlein's "Have Spacesuit, Will Travel",
where the main character, Kip, gets out the tv set that he built himself
in order to see if he'd won the contest he'd entered. Decades later,
probably people reading it for the first time may puzzle over that passage.

Michael

Michael Black wrote:


People were probably making tv sets as soon as there were tv signals.
This would date to the days of various experimental schemes, who can
forget the neon bulb and rotating wheel?, but of course would become
less experimental once regular broadcasting started.

Since there were few or no commerically made TV sets circa 1939,
the only way the average person could see the broadcasts from the World's
Fair that year was by building a TV set.

I've heard that the hobby magazines carried construction articles then
or a bit later.

See this post...
http://www.sparkbench.com/tv.jpg

This was a magazine cover from 1928. Amazing in a Jules Verne kind of
way how we now have similar looking TV sets not to mention a QVC host
pushing off baubles on the viewer!
The articles inside the magazine, however, show nerdy looking guys in
funny looking suits peering thru a peephole of a room-sized receiver
just to see a still image.

-Bill M

With the modern TV sets of today, this would be very difficult. They are
mostly computer run, and dependent on complex software to run and be set-up.
TV sets are very low in cost today for the performance offered. It would
not be viable to try to build one yourself. And, with the types of
components circuits that are used today, it would be very complex to do from
scratch, or start taking sections from one to the other.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"Jason D." wrote in message
...
I remember one tech worked to save a very old RCA 20" tv that had
VIPUR IC die and got bypassed with STR30xxx regulator and isolator
transformer, add external standby power supply.

Now, I wondered if others had done this except take a desireable
chassis and "improve" on it with designs to key areas that can bear
improvments with nice ideas from other chassis even from other
brands'.

For example: Take a JVC chassis, take out their audio amp and put in
better amp on seperate board tapped into audio from chassis and use
four speakers one for lows & mids and tweets for the highs. Fix the
lousy HV regulation with idea based on CTC169 projector HV boost or
one like the TX826 chassis which is outstanding idea of HV regulation
by modifying the horizontal pulses and is fed by raw DC without
regulator. Etc.

Also is there a way to massage the video signal so not to make over
driven images to rid of sparkles & comets?

Your choices of desireable chassis and ideas on modifying the chassis
too.

So on...

Cheers,

Wizard

If I was going to do this I would go whole hog and do it right. mixing old
technology with new can be done, but it is not easy.

I think one of the main things to do is build your own freakin power supply.
Make one with OC foldback and maybe even an output fuse !

Got an original XBR (like I do), what happens when that SMPS fries, well it's
either parts or supply it ! Wait till you hear about my stereo ! lolol

All I can say is that yes, I am now qualified to do anyhting with nothing.

I'll give it some thought, I like doing stuff like this, but I don't do it at
work, I can't.

Actually if a choice was made of a set that has a ****ty power supply, I'd love
to take a crack a "supplying" that, at least the design. I have designed and
built a few things.

On 11 Mar 2004 05:46:27 GMT, (Michael Black)
wrote:

Jason D. ) writes:
I remember one tech worked to save a very old RCA 20" tv that had
VIPUR IC die and got bypassed with STR30xxx regulator and isolator
transformer, add external standby power supply.

I don't think you're going far enough back.

People were probably making tv sets as soon as there were tv signals.
This would date to the days of various experimental schemes, who can
forget the neon bulb and rotating wheel?, but of course would become
less experimental once regular broadcasting started.

Since there were few or no commerically made TV sets circa 1939,
the only way the average person could see the broadcasts from the World's
Fair that year was by building a TV set.

I've heard that the hobby magazines carried construction articles then
or a bit later.

And it's immortalized in Robert Heinlein's "Have Spacesuit, Will Travel",
where the main character, Kip, gets out the tv set that he built himself
in order to see if he'd won the contest he'd entered. Decades later,
probably people reading it for the first time may puzzle over that passage.

Michael
Well... I grew up in the fifties, my old man's shop opened in 54 in
fact didn't actually start servicing tv's untill around 56. Not that
he couldn't, just didn't get any in untill then.