UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Television and Video

Notices

Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

Closed Thread
 
Thread Tools
Old 18th Aug 2006, 12:19 pm   #1
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Sharp TRP801

I recently acquired this Sharp transistor TV set.
This 1960 set was designed to operate on the 819 line standard in France. I don't think a version for the UK was ever made.

My set has a UHF conversion unit so the set must work OK on the 625 line standard system L.
For system I a FM sound stage will have to installed and the vision demodulator changed for negative vision modulation systems.

The set has real early sixties look about it.

For the time being the will be a display item.

DFWB.
Attached Thumbnails
Click image for larger version

Name:	Sharp TRP-801.jpg
Views:	394
Size:	60.0 KB
ID:	5023  
FERNSEH is offline  
Old 23rd Aug 2006, 9:08 pm   #2
Focus Diode
Octode
 
Focus Diode's Avatar
 
Join Date: Jan 2006
Location: Borough of Gateshead, UK.
Posts: 1,420
Default Re: Sharp TRP801.

Wow! I didn't think Sharp were around back then, Sony yes but not Sharp.
What a great find!

Cheers,
Brian
Focus Diode is offline  
Old 24th Aug 2006, 10:44 pm   #3
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Sharp TRP801.

Hi Brian,
Actually, Sharp is a very old firm, starting their business in 1915 making the EverSharp propelling pencil. I don't know when they diversed into electronic items.
I believe Sharp made their first production TV set in 1953.
As for sales in the UK, Sharp (UK) Ltd. started trading in 1973/4. Before that date their products must have been imported by private concerns.

Returning to the TRP801. Versions will have been made for the NTSC countries. It is likely that it was uneconomical to make a 405 line set.

DFWB.
FERNSEH is offline  
Old 22nd May 2020, 4:15 pm   #4
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Sharp TRP801 revisted.

I introduced this interesting portable 819 line TV set in this forum in 2006.
It's about time I made a start on the restoration.
The receiver is equipped with an UHF tuner for 625 line system L transmissions.

DFWB.
Attached Thumbnails
Click image for larger version

Name:	SharpTRP801_1.jpg
Views:	203
Size:	70.8 KB
ID:	206463   Click image for larger version

Name:	SharpTRP801_IF_board.jpg
Views:	233
Size:	157.5 KB
ID:	206464   Click image for larger version

Name:	SharpTRP801_TB_PCB.jpg
Views:	213
Size:	51.9 KB
ID:	206465  
FERNSEH is offline  
Old 22nd May 2020, 5:17 pm   #5
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Sharp TRP801

The add-on UHF tuner. Note the mixer diode. No RF amplifier. Typical late fifties and early sixties practise.

DFWB.
Attached Thumbnails
Click image for larger version

Name:	SharpTRP801_UHF_tuner.jpg
Views:	201
Size:	55.0 KB
ID:	206472  
FERNSEH is offline  
Old 22nd May 2020, 8:06 pm   #6
1100 man
Octode
 
1100 man's Avatar
 
Join Date: Apr 2016
Location: Ventnor, Isle of Wight, & Great Dunmow, Essex, UK.
Posts: 1,377
Default Re: Sharp TRP801

Hi David,
I'm glad I'm not the only one that takes a long time to get round to things!!

That PCB looks very well made. Is it double sided or did they just choose to mount the components on the print side? It's very neatly drawn as well- almost like it's been done with CAD software rather than drawn by hand.

Most early PCB's have very curly tracks- it's hard to believe it dates from 1960!

Are those Toshiba logo's I can see on the transistors?

I wonder how good those wax covered caps will be? Or will they have suffered as badly as our British ones?

Looks like another interesting restoration is on the cards!

All the best
Nick
1100 man is offline  
Old 22nd May 2020, 8:49 pm   #7
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Sharp TRP801

Hi Nick,
It's a single sided printed circuit board and the print layout shown on the components side is a most welcome if any serious servicing is required.
There is a mixture of Toshiba and Hitachi transistors, also some Sharp branded power types. The CRT was made for Sharp by the Hayakawa Electric Co. Ltd., type 210EB4.

DFWB.
FERNSEH is offline  
Old 22nd May 2020, 8:53 pm   #8
jhalphen
Hexode
 
Join Date: Jul 2004
Location: Paris, France
Posts: 345
Default Re: Sharp TRP801

Hi to all,

An advert for the Sharp TRP-801 by the French importer (General Television)

+ a reduced weight schematic.

Fernseh already has the full data,

Best Regards
jhalphen
Attached Thumbnails
Click image for larger version

Name:	Sharp TRP-801-12.jpg
Views:	201
Size:	27.8 KB
ID:	206478   Click image for larger version

Name:	Sharp-TRP-801 Schematic-03.jpg
Views:	192
Size:	183.0 KB
ID:	206479  
jhalphen is online now  
Old 22nd May 2020, 9:26 pm   #9
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Sharp TRP801

Hi Jerome,
many thanks for sending me the servicing information, now I have no excuses but to just get on with the restoration of this interesting receiver.
Noteworthy is the six stage vision IF amplifier, the circuit designer had real gain versus bandwidth considerations for the 819 line system.
Systems E and L employed positive video modulation so that helped to simplify things somewhat. AM sound.

DFWB.
FERNSEH is offline  
Old 23rd May 2020, 12:03 am   #10
AJSmith625
Pentode
 
Join Date: Nov 2017
Location: Birmingham, West Midlands, UK.
Posts: 171
Default Re: Sharp TRP801

Hello David, What an interesting set there. I enjoy reading about these early 60s portables although I have never repaired one. Looking at the circuit diagram I can't help noticing the 2 valves in the EHT doubler don't appear to have any heater supply from the LOPT. Am I missing something here? Look forward to reading more.

Alan.
AJSmith625 is offline  
Old 23rd May 2020, 12:58 am   #11
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Sharp TRP801

Hi Alan,
according to the information for the 5642 HV rectifiers the valves have directly heated cathodes. The line output transformer will have separate highly insulated windings for each valve. The filament voltage is only 1.25V so it's possible only one turn is all that's required on the transformer.

From the Radiomuseum: https://www.radiomuseum.org/tubes/tube_5642.html

From R-type.org: http://www.r-type.org/exhib/aai0016.htm

DFWB.
FERNSEH is offline  
Old 23rd May 2020, 9:50 am   #12
Brigham
Octode
 
Join Date: Mar 2006
Location: Co. Durham, UK.
Posts: 1,111
Default Re: Sharp TRP801

It's a splendid looking set, and matches the red shoes splendidly.

Can't see any standards switching. Is 625 simply in range of the line hold?

I'd probably be ditching that UHF tuner, assuming the VHF one is still there.
Brigham is offline  
Old 23rd May 2020, 12:41 pm   #13
Welsh Anorak
Dekatron
 
Welsh Anorak's Avatar
 
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,877
Default Re: Sharp TRP801

That's interesting - and a nicely drawn diagram too. Is the PCB blank on the reverse side? I notice there are supplies fed from the LOPT which must have been a relatively new concept at the time, and would have needed fast switching diodes..
__________________
Glyn
www.gdelectronics.wales
Welsh Anorak is offline  
Old 23rd May 2020, 1:33 pm   #14
Maarten
Dekatron
 
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,175
Default Re: Sharp TRP801

Hayakawa Tokuji was the founder of Sharp, so chances are Hayakawa Electric would have been a fully owned subsidiary.
Maarten is offline  
Old 23rd May 2020, 3:31 pm   #15
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Sharp TRP801

Quote:
Originally Posted by Maarten View Post
Hayakawa Tokuji was the founder of Sharp, so chances are Hayakawa Electric would have been a fully owned subsidiary.
From Wikipedia:
https://en.wikipedia.org/wiki/Tokuji_Hayakawa

DFWB.
FERNSEH is offline  
Old 23rd May 2020, 4:45 pm   #16
Tractionist
Heptode
 
Join Date: Apr 2016
Location: Cheltenham, Gloucestershire, UK.
Posts: 870
Default Re: Sharp TRP801

Sharp got around e.g. Three Aces Electronics - Part Hardcourt .... Nigeria.
__________________
Red to red, black to black. Throw the switch and stand well back!
Tractionist is offline  
Old 23rd May 2020, 4:45 pm   #17
Tractionist
Heptode
 
Join Date: Apr 2016
Location: Cheltenham, Gloucestershire, UK.
Posts: 870
Default Re: Sharp TRP801

That's "Port" .... !!!
__________________
Red to red, black to black. Throw the switch and stand well back!
Tractionist is offline  
Old 23rd May 2020, 5:51 pm   #18
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Sharp TRP801

News Flash! The line oscillator is functioning on both standards.

The CRT and line output transistor removed in order to carry out initial tests.
Power supplier set to 12volts and connected to the full-wave rectifier diodes. Oscilloscope connected to the base wire of the line output transistor. The attachments show the base drive waveforms on 625 and 819 lines.
The frame oscillator is working but there is no waveform present at the collector of the output transistor.

DFWB.
Attached Thumbnails
Click image for larger version

Name:	SharpTRP801_line_drive_625.jpg
Views:	98
Size:	73.1 KB
ID:	206561   Click image for larger version

Name:	SharpTRP801_line_drive_819.jpg
Views:	102
Size:	66.0 KB
ID:	206563  
FERNSEH is offline  
Old 23rd May 2020, 6:59 pm   #19
jhalphen
Hexode
 
Join Date: Jul 2004
Location: Paris, France
Posts: 345
Default Re: Sharp TRP801

Hello to all,

@Fernseh : Great ! David, nice progress.

Do you have an Aurora with 819 RF out to test the receiver in VHF E standard ?

Maybe you have a 819 capable generator from your several visits to France.

Best Regards
jhalphen
Paris/France
jhalphen is online now  
Old 24th May 2020, 9:07 pm   #20
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Sharp TRP801

"Do you have an Aurora with 819 RF out to test the receiver in VHF E standard" ?
Hi Jerome,
I still have the original multi-standard Aurora converter, this device doesn't have a modulator and for 819 lines I use the System E modulator that Wilfrid made for me. Outputs to channel F8
Also for 819 lines the Philips GM2891 pattern generator donated to me by Mr. Poulain. It's the /13 version. Similar instruments were made for USA standard M (/60)and CCIR 625 lines (/50). Never seen a 405 line version.
Instrument uses an early UHF valve, the EC80:
https://www.radiomuseum.org/tubes/tube_ec80.html

DFWB.
Attached Thumbnails
Click image for larger version

Name:	Philips_GM2891-13.jpg
Views:	106
Size:	72.9 KB
ID:	206695  
FERNSEH is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 8:48 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.