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  #1  
Old 07-02-2012, 09:02 PM
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Tesla model 4001

Does anyone else have a Tesla TV? This is a Tesla 4001av sitting on a Magnavox 10" AM/FM/TV/Phono console.

I think the Tesla 4001 is the first model of TV made in Czechoslovakia. So says the article SDELOVACI TECHNIKA.

The article is very long and in the Czech language but here is a description of the TV, badly translated. I have the article and a service manual copy. needs scanned.

Linear ("TRF" tuner with bandpass stages following, then a detector) TV receiver for 1st TV channel with intermediate sound system 6.5 MHz powered from AC net 120-220V/50Hz. Direct sychronisation, round picture tube 25 cm, wooden cabinet, paper back and bottom covers, picture size controls on left side, electromagnetic focus. Version 4001A-b and 4001A-c have switch for switching off picture circuits for receiving only TV sound. First Czechoslovakia TV receiver, when TV broadcasting was started in 1. 5. 1953. It would have used the system that became PAL I think.

My friend from Czech Republic says the old color TV sets reverted to a red tint when monochrome programs were shown. Don't ask me, I have no color set from the old country!

What do you guys think of the TV set? The cabinet itself is a fine craftsman's work, truly lustrous and beautifully made and very heavy. Last time I had it on, maybe 15 years ago, it had a very compressed vertical sweep on the screen; no harm done at low brightness and I was able to feed modulated RF in and see the artifacts on the scan. I have not worked with it having no proper generator.

I was told by my Czech friend that the TV has only need of two channels because the country is small and the two powerful stations covered it back then.
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Last edited by Opcom; 07-02-2012 at 09:56 PM.
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Old 07-03-2012, 06:20 AM
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Contact Darryl Hock for a converter, or visit the website: http://www.tech-retro.com/Aurora_Design/Home.html
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Old 07-03-2012, 07:27 AM
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Nice and clean! I can't wait to see the insides! I wonder how close it looks to an East German set seen elsewhere on VK?
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Old 07-03-2012, 03:20 PM
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Quote:
Originally Posted by Opcom View Post
My friend from Czech Republic says the old color TV sets reverted to a red tint when monochrome programs were shown. Don't ask me, I have no color set from the old country!
They were under communist rule back then, yes? You know "Better dead than red!". So it stands to reason that their TVs would revert to red...

Maybe your friend's TV needed the color bias adjusted? The red gun's bias set too high.
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Old 07-03-2012, 06:20 PM
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"... First Czechoslovakia TV receiver, when TV broadcasting was started in 1. 5. 1953. It would have used the system that became PAL I think."

The color would've been SECAM which is what was used by the USSR and its European "clients" until PAL was adopted following the "change in management philosophy"... That also explains why regular broadcasting started on the first of May, the socialist Labor Day holiday.

I'd also look inside for other "tweaks". Beginning with the 6.5MHz video/audio carrier offset because when I visited what was then Czechoslovakia (while living in Austria), most of the TV antennas I saw were aimed towards Austria! I bet more than a few TV repair techs, ham operators, etc., supplemented their official income by doing "re-alignments"!
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Old 07-03-2012, 10:15 PM
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He's a technician name of Jan Kopalek. For years he built Marshall amplifier copies using parts built, bought, or moved from other locations. He wound his own transformers and made knobs of epoxy using home made molds. Today in the old country, many of his amplifiers are still highly prized by their owners and command high prices. I think his largest cost was the British output tubes, hard to get in the old days and he offered a local substitute as an option. He also made mixing boards, with the name "Voijta" on them, his son's name. He and I owned a TV shop together in Dallas TX from about 1982 to 1993. Quite a character! and a master at audio repairs of any kind. He said the red color was transmitted, but he used to tell a lot of stories and jokes about the regime and the aparatchiks.

If I ever get back to the set, I will take care to document any tweaks as best as possible before alignment. I don't know if the video RF amp bandpass uses staggered tuning or no. Would not want to mess it up.

What standard did Austria use in those days? Channel frequencies? I vaguely remember some story about that.

The set had an option, an RF amp that could be installed in the cabinet if reception was difficult. I think, after reading this, there may have been many sold! I'll have to get to the back of the set and look inside, I'll take pictures when I do. There is a space in the set for a long chassis according to a picture, and the manual shows a chassis there.

It's all in the Czech language so I'll be a bit lost. I don't know much about OCR and how it will work with the special characters and marks, so dumping it in a translator may not help.
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Old 07-04-2012, 10:07 AM
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Austria used PAL for color. I sent you details on channels and frequencies via PM...
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Old 07-04-2012, 10:36 AM
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Oh, yeah...I had a pen pal in Tallinn, Estonia, & she said the TV antennas all faced Sweden/Finland... The local Soviet Commissar would come to town & raise hell, the antennas would get taken down/moved, & soon as he left, they'd swing 'em back...
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Old 07-04-2012, 05:44 PM
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Tesla

When you get bored with it, Ill take it from you for my
foreign collection
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  #10  
Old 04-18-2013, 09:52 AM
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Hi opcom!

I have seen your post a little late, because I am short in time.
I have several versions of them, the first sets have no bars
infront of the speaker.
The 4002 has a 3-band AM-Radio.
Because in the beginning 50s FM started, you can use the set as a
one channel FM Radio, too.
It is a One-Channel TV, not original are later added turret-tuners.
I own the complete manual, this will help you more (send me your email).
The CRT looks like a 10BP4, but has a Loctal-socket.
The construction is made of moduls, wired, but it is the best
serial produced TV of the world, because of the construction.
It makes fun to work on it.
They stopped the production in 1957, it was a good runner!
The cabin is well-designed (O.K. out of season,in relation to the western
world), but made in a fine quality!
The speakers of these sets are something I miss in the most US TV sets!

TV-Collector
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Old 04-18-2013, 10:11 PM
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Quote:
Originally Posted by Opcom View Post
He's a technician name of Jan Kopalek. For years he built Marshall amplifier copies using parts built, bought, or moved from other locations. He wound his own transformers and made knobs of epoxy using home made molds. Today in the old country, many of his amplifiers are still highly prized by their owners and command high prices. I think his largest cost was the British output tubes, hard to get in the old days and he offered a local substitute as an option. He also made mixing boards, with the name "Voijta" on them, his son's name. He and I owned a TV shop together in Dallas TX from about 1982 to 1993. Quite a character! and a master at audio repairs of any kind. He said the red color was transmitted, but he used to tell a lot of stories and jokes about the regime and the aparatchiks.
.
Was that K&O TV? If so, we probably know each other, even though it has been 20+ years...
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Old 01-18-2019, 11:04 PM
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My shop was called Webb Royal Electronic Service, then later American Audio Video, in Dallas Texas.

Sorry to reply 6 years late.. have had much work!!
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