Nera Projection Television - UK Vintage Radio Repair and Restoration Discussion Forum

farvis liam · 3rd Oct 2019, 9:38 pm

Hallo from Farvis TV Museum Germany. We are restoring a Nera C30 Projection Television.We desperately need circut data or a chat with someone that has this set. I am new to this forum . If anyone needs any info on German TVs or Cameras I will do my best to help. wish you all a nice evening.

FERNSEH · 7th Oct 2019, 9:35 pm

Some information about NERA projection TVs
http://www.thevalvepage.com/tvmanu/nera/nera.htm

DFWB.

simpsons · 8th Oct 2019, 10:42 pm

Perhaps slightly off topic, in 1980 Mitsubishi used the clever idea of having the image reflected back onto a fixed focal length screen in their 50" colour projection TV. Sony did the same the following year. I have no idea if Mitsubishi re invented the wheel, so to speak, or .....they too came across the Nera design!

Chris

FERNSEH · 9th Oct 2019, 10:08 pm

Chassis layout of the NERA C30. Everything looks fairly straight forward. In the event of timebase failure the receiver does have protection for the CRT.
Item 7: thermistor compensating unit. What's that all about?
EHT generation will be from the 25KV Philips unit. The optics will also be Philips.

DFWB.

Heatercathodeshort · 11th Oct 2019, 7:43 pm

I'm going to guess David. Could it be something to stabilize the focus? John.

FERNSEH · 11th Oct 2019, 8:04 pm

"I'm going to guess David. Could it be something to stabilize the focus?"
Hi John,
You could well be right because there is no indication of a focus stabiliser valve which was usually an EL41 power pentode.
The set does have a CRT protection valve but it's impossible to tell what type of valve was employed.

DFWB.

3rd Oct 2019, 9:38 pm	#1
farvis liam Retired Dormant Member Join Date: Oct 2019 Location: Pfungstadt, Germany Posts: 1	Nera Projection Television Hallo from Farvis TV Museum Germany. We are restoring a Nera C30 Projection Television.We desperately need circut data or a chat with someone that has this set. I am new to this forum . If anyone needs any info on German TVs or Cameras I will do my best to help. wish you all a nice evening.

7th Oct 2019, 9:35 pm	#2
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Nera Projection Television Some information about NERA projection TVs http://www.thevalvepage.com/tvmanu/nera/nera.htm DFWB.

8th Oct 2019, 10:42 pm	#3
simpsons Octode Join Date: Feb 2007 Location: Harrow, London, UK. Posts: 1,493	Re: Nera Projection Television Perhaps slightly off topic, in 1980 Mitsubishi used the clever idea of having the image reflected back onto a fixed focal length screen in their 50" colour projection TV. Sony did the same the following year. I have no idea if Mitsubishi re invented the wheel, so to speak, or .....they too came across the Nera design! Chris

9th Oct 2019, 10:08 pm	#4
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Nera Projection Television Chassis layout of the NERA C30. Everything looks fairly straight forward. In the event of timebase failure the receiver does have protection for the CRT. Item 7: thermistor compensating unit. What's that all about? EHT generation will be from the 25KV Philips unit. The optics will also be Philips. DFWB. Attached Thumbnails

11th Oct 2019, 7:43 pm	#5
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: Nera Projection Television I'm going to guess David. Could it be something to stabilize the focus? John.

11th Oct 2019, 8:04 pm	#6
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Nera Projection Television "I'm going to guess David. Could it be something to stabilize the focus?" Hi John, You could well be right because there is no indication of a focus stabiliser valve which was usually an EL41 power pentode. The set does have a CRT protection valve but it's impossible to tell what type of valve was employed. DFWB.