Show us your vintage B&W sets! - Page 6 - Videokarma.org TV - Video

Rob · #76 09-03-2002, 09:36 AM

Quote:

Originally posted by Eric H

I just picked up a 721-TS Here are a couple pics of the chassis.

It looks like it hasn't been touched in decades

Eric

Eric,

That 721 chassis sure came clean. No corrosion either. Bonus!

I have a 721 also but haven't had a chance to look inside yet. It is just on display as-is. Your photo shows the first electromagnetic ion trap I've ever seen. Amazing! I guess my set has one too.

I can scan the 721 schematic for you if needed from my Riders TV if it is in there (probably is). Let me know.

Rob

jshorva65 · #77 09-03-2002, 10:48 AM

I also have a schematic for the 721TS. I have two Sams libraries (1-2284 and 1-1871) and will be listing the smaller of them (1-1871) on eBay soon.

ChuckA · #78 09-03-2002, 07:50 PM

Finally got a somewhat viewable picture on this "small" set so I thought I'd share with the group a set you would have watched sporting events at your local tavern around 1947.

This is a US Television T-525 projection set, the picture is 25" x 19", it stands just over 6' tall. The design is surely pre-war as all tubes are octal except for the modified tuner which uses miniatures and the addition of an add on chassis for horizontal sync. The power supply is one step above a brute force type from pre-war, uses an RF oscillator and tripler putting out 30KV.

ChuckA · #79 09-03-2002, 07:53 PM

Here's a picture from the T-525. The mirror is dull so the picture is dim and a bit fuzzy. I have some new front surface mirrors from modern projection sets that I'll try and cut down and use.

***Eric H*** · #80 09-06-2002, 12:20 AM

Rob, I have a Sams now, I copied it from the Library.

The set is giving me fits trying to get the vertical sweep to work

I have replaced many of the small caps and checked resistors and transformers but still no luck. I just ordered all the Lytics from Mouser, I think I wiil change those before I try anything else.

Eric

***Eric H*** · #81 09-11-2002, 01:20 AM

Hey guys, I added some more sets to my page including a page for this Hallicrafters which I am particularly proud of because it was such a piece junk when I got it.

Eric
www.vintagetvsets.com

Marlin Mackley · #82 09-11-2002, 09:52 PM

Eric:
Great television! Is it a channel one set? I had probs with mine because it was too early for the sams diagram, with several tubes being quite different, and it had the deleted #1 channel.

Rob · #83 09-12-2002, 12:43 AM

Eric,

Yours looks just like mine...terrific! Mine looked like junk, all rusted until my restoration. I have the earlier 1947 model with Ch.1 and all octal IF tubes. The later chassis went to miniature tubes. This later model is more common. I know your's is channel one but which chassis have you got? Great set!

Rob

Rob · #84 09-12-2002, 12:54 AM

Here's a picture of mine running after my complete restoration.

Rob

***Eric H*** · #85 09-12-2002, 11:26 PM

Hi Rob, Marlin. This set has channel 1 but with the later chassis. I had a similar problem with Sam's that my Sam's was for the octal tube set. Fortunantly I didn't run into any problems where I needed a correct schematic. Grubby as this set was the chassis would produce a raster as it was.

I have two of the wood cased models too, a 505 and a 506? in bad need of restoring also (all with the later chassis) I had a set of brown knobs made at the same time as the black ones for the T-54 wish I could have some 7JP4s made

Rob · #86 09-12-2002, 11:42 PM

Here's a before photo of my T-54 as found. Besides the rust the fine tuning knob and shaft was completely missing from the variable tuning capacitor. I had to manufacture a 1/8" shaft and solder it into a hole I drilled into what was left of the old front of the tuning cap and also fabricate a new knob out of aluminum and setscrew to match the pushbuttons next to it. The HV supply was not repairable because of a broken HV RF coil so I scrapped the entire stock HV system and built a new 60Hz HV supply into the HV cage using a 6 kV bug zapper current limited transformer, a HV diode and a big capacitor. This set makes a bright image that will not bloom. The HV supply is pretty stiff, and lethal, just like in a prewar TV. I placed a series 100K, 2 watt resistor in the supply output to limit arc current to non destructive levels. The entire set got recapped and the tuner was completely cleaned out with 200 PSI air and alcohol through a solvent gun. It works on all channels.

I also had to locate an old Halli short wave receiver of similar vintage to get a genuine Hallicarafters 'h' emblem button for the front panel.

Rob

Rob · #87 09-12-2002, 11:57 PM

Here is what the early 1947 octal chassis in the Halli T-54 series looks like. There is something special about an early post war TV with almost all octal tubes. I like those the most of the early B&W's I collect.

Rob

Marlin Mackley · #88 09-13-2002, 06:53 AM

Hello Eric and Rob;
I can't brag about a great cleaning job on my 505 'cause I only wiped it out with a damp cloth. I did recap it, except for the HV deflection caps that I have yet to aquire, so it is not up and running. Rob, great idea using that bug zapper supply! (Just on that thought, wouldn't it have been fun if Frank Zappa had named his son Bug??) Sorry, I digress. My Halli has the old tube complement, and my sams the later. Not sure but it sounds like there are two versions of the sams. I paid a fare amount for this set, but found the Mahogony version for $5 at a yard sale! That one was, and still is kinda rough but at least had the magnifying lense mounts. Eric, where did you get those knobs made? I have different sets going knobless. No, the bass drum it NOT some sort of newfangled antenna!

Rob · #89 09-13-2002, 08:34 AM

Quote:

Originally posted by Marlin Mackley
Hello Eric and Rob;
I can't brag about a great cleaning job on my 505 'cause I only wiped it out with a damp cloth. I did recap it, except for the HV deflection caps that I have yet to aquire, so it is not up and running. Rob, great idea using that bug zapper supply! (Just on that thought, wouldn't it have been fun if Frank Zappa had named his son Bug??) Sorry, I digress.

Marlin,

That suggestion for Frank Zappa's son's name "Bug" was hilarious! LMFAO. Your T-54 looks great with the normal age showing for its vintage. My plastic screen window was aged and yellowing around the edge like yours so I got some 1/16" plexyglass from a sign shop and cut (successfully without cracking, thank goodness for having a belt sander) a new window for mine.

I can send you some new 0.002uF@10 kV
disc caps that I use for my electrostatic recaps. Use two in parallel for the V section and singly for the H section. You will need a total of 6. PM me your postal address and I'll drop 'em in the mail no charge for an AK buddy.

Rob

Marlin Mackley · #90 09-13-2002, 10:04 AM

Oops, I meant T-54. Too many tv's 'round here, I get them mixed up! The wood with metal front is the T505.