u/Curious_Teach_7720

I have to say, I have owned snd restored quiet a few very nice black white sets. This may be the most beautiful black and white picture I have ever seen, alongside my Philco 48-1001.

This is a Zenith 16e21Q and is barley used. The rouland 21CXP4 produces a raster so bright it practically burns my eyes with oodles of cutoff. The video circuit is DC coupled so no DC clamp is needed in a set of this type.

I also got the Remote control unit working flawlessly. I found out my Apogee Slant 6 speakers are capable of produced 40.5khz and 41.5khz tones with precision. I trigger the Television with REW and even in another room it works! There was a failed paper tube eletrolytc apscitor inside the remote unit that was leaking heavily causing random triggers or channel changing that would not stop. So this cap was replaced to get it working, alongside some drifted resistors. I can't believe people just left that thing running 24/7. So much energy! Haha.

The set worked absolutely perfectly as I got it and produced a image this good without a single factory part removed. Owned by the current owners grandmother since purchase in 1960. It was never serviced and I was first to pop the chassis bolts. Currently I have eletrolytcs replaced underneath with phenolic strips. Nothing wrong with providing it longevity.

A really intresting aspect of this chasiss is the big 21inch CRT is mounted to the chasiss itself. So it slides out as one giant peice and entire TV can be ran outside of the cabinet. Cabinet has tinted green glass for better blacks in higher light.

Tv is mounted on slanted feet and had a very classy slanted art decca look. Initially cabinrt was covered in a terrible blue latex housepaint. Which was pealed away with a light surfacant/degreaser

RCA 8-PT-7010.

Always amazed by this little thing!!

It is pretty amazing RCA managed to squeeze an entire fully Tube TV into this tiny chassis.

This particular CRT has a very tiny bit of what almost looks like ION burn. I very hard to see but present circle of slightly more worn phosphor in the middle. Very strong bright tube. But this tube has ION trap and bent guns, so this should not be possible?

I have always wondered about how it happened. When tv turns off and there is no deflection collapsing dot, raster just vanishes so unsure how this happened in the past. Not visible unless I look for it.

First off. It had a horrible paint job. It was latex paint. So letting some degreaser sit on the paint makes it lop off like wet paper.

Other than new eletrlytcs, the thing fired right up! A glorious black and white picture.

This set is incredibly low hour and performs as so.

I also need to fix some things around the yoke. Paper insulation has fallen out, causing the width metal leaf to be as high risk of arcing over from the yoke. Also need to reinforce front plastic of yoke and find a way to mount centering rings since the plastic mounts are long deteriorated.

Coming from color sets from a simular time period, Oh my! It's like a vacation for my brain. So lightweight and easy to finesse and work on!

Shango066 repairing a color roundie while being played back on a color roundie after repairing this color roundie. 😀

I did some experimenting with R max cathode connection.

This 21FPB22 is a near new Colorama. The emissions on all three guns are exordinarly balanced. R max is usually used for least efficent phosphor. I found the gain for red was to high, yet I have no control for red gain. Red where always heavy.

I have had people tell me this is due to Zeniths Demodualtor being a bit funky and output is a bit inbalanced. However even if this is the case, the red on the 21FPB22 is quiet aggressive and very intense. That orangy leaning almost neon red.

Using R max for any of the three guns results in the raster leaning that color assuming G and B gain is off. So very equal and more of a preference thing. No gun appears stronger than other guns on this tube.

So the solution was to swap red R max with Blue cathode. This allowed the B drive to effect red without changing my cutoff setting. Leaving the image very balanced. I can bring red drive down now and this does not effect the screens. Where originally red was stuck running with really high gain which was a tad to much red in my opinion. Again could be a combination of demodualtor and CRT.

I also don't find myself leaving color levels too low to prevent red from being too aggressive leaving blue and green a bit dim as a result.

Zenith 27KC20 Fully Restored.

Still widdling out more performance from this thing. This is about as good as it will sound being it sounds great! Especially for the time this was something very special.

Using stock internal 1948 speaker for this sound demo. Unit also has ability to drive external speaker with its 6SN7 Push Pull audio amplifier.

Alternatively with a simple circuit, this can be dropped to line level signal and be fed into a normal stereo system if you choose too.

Tape being used is ATR MDS-36. Modification had to be made to reduce tension of contact pad assembly. Otherwise moderm tape slips on cork capstan due to the pressure.

All 3x Motors rotors also had to be dissambled and cleaned for any chance for speed to be constant and reliable. Stuck on gunk was causing drag on rotors and speed was never remained same hour to hour.

All caps also had to go. All of them.