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 Audio (record players, hi-fi etc)

Notices

Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment.

Closed Thread
 
Thread Tools
Old 16th Sep 2017, 2:29 pm   #1
uk_snowman
Hexode
 
Join Date: Jun 2013
Location: Norwich, Norfolk, UK.
Posts: 281
Default Sharp Stereo Ensemble (Troika) Model-GPS-525

I picked up a Sharp transistor Radiogram the other week

I think its lates 60`s or early 70`s

On the front flap it says Troika 525 and at the rear Sharp Stereo Ensemble Model-GPS-525

The r/h output is dead at the moment and i have been looking for a diagram for it but cannot find anything about it on the web.
Attached Thumbnails
Click image for larger version

Name:	IMG_20170916_113330938.jpg
Views:	218
Size:	103.0 KB
ID:	149535   Click image for larger version

Name:	IMG_20170916_113343693.jpg
Views:	219
Size:	78.8 KB
ID:	149536   Click image for larger version

Name:	IMG_20170916_141330197.jpg
Views:	174
Size:	58.0 KB
ID:	149537   Click image for larger version

Name:	IMG_20170916_141342484.jpg
Views:	167
Size:	58.8 KB
ID:	149538   Click image for larger version

Name:	IMG_20170916_142353129.jpg
Views:	186
Size:	60.0 KB
ID:	149539  

__________________
Now where did I put that part again!!!
uk_snowman is offline  
Old 16th Sep 2017, 2:49 pm   #2
Nuvistor
Dekatron
 
Nuvistor's Avatar
 
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 9,427
Default Re: Sharp Stereo Ensemble (Troika) Model-GPS-525

Is it just MW?
It may be a little older than late 60's/early 70's, perhaps middle 60's, looking at the PCB with the driver transformers, most designs had removed those by the late 60's. On the other hand that's just a guess.
At least with one channel working and the driver output stages easily identified it " could" be straightforward, hope so.
__________________
Frank
Nuvistor is online now  
Old 16th Sep 2017, 2:50 pm   #3
uk_snowman
Hexode
 
Join Date: Jun 2013
Location: Norwich, Norfolk, UK.
Posts: 281
Default Re: Sharp Stereo Ensemble (Troika) Model-GPS-525

yes just MW
__________________
Now where did I put that part again!!!
uk_snowman is offline  
Old 16th Sep 2017, 3:00 pm   #4
Edward Huggins
Dekatron
 
Join Date: Sep 2015
Location: Southwold, Suffolk, UK.
Posts: 8,302
Default Re: Sharp Stereo Ensemble (Troika) Model-GPS-525

This is an early transistor piece and very rare. Is it "dead" on Radio and Records? It may be very hard to trace the circuit diagram and you may need to troubleshoot and signal inject stage by stage.
__________________
Edward.
Edward Huggins is offline  
Old 16th Sep 2017, 3:38 pm   #5
Guest
Guest
 
Posts: n/a
Default Re: Sharp Stereo Ensemble (Troika) Model-GPS-525

At least one half is working, time for a bit of voltage measuring I think. And treble check that the working side is correctly identified! 'tis a rather splendid thing.
 
Old 16th Sep 2017, 3:49 pm   #6
Andrew2
Nonode
 
Andrew2's Avatar
 
Join Date: Mar 2010
Location: Dukinfield, Cheshire, UK.
Posts: 2,034
Default Re: Sharp Stereo Ensemble (Troika) Model-GPS-525

I like that, the style appeals to me. The innards look pretty sloppily assembled though, not unlike some Russian stuff from the late 60's.
__________________
Andy G1HBE.
Andrew2 is offline  
Old 16th Sep 2017, 4:07 pm   #7
julie_m
Dekatron
 
Join Date: May 2008
Location: Derby, UK.
Posts: 7,735
Default Re: Sharp Stereo Ensemble (Troika) Model-GPS-525

The word "Troika" sounds Russian, but Sharp is definitely Japanese. Some sort of weird collaboration going on?

I agree with merlinmaxwell, get your multimeter out! And your camera -- pictures never hurt. Modern high-resolution cameras can capture enough detail to withstand a lot of zooming. Printouts can easily be marked up. With a bit of luck, the two amplifier circuits will just be straight side-by-side copies of each other and it will be easy to identify corresponding test points. The transistors it uses are unlikely to be anything special.
__________________
If I have seen further than others, it is because I was standing on a pile of failed experiments.
julie_m is offline  
Old 16th Sep 2017, 6:40 pm   #8
'LIVEWIRE?'
Rest in Peace
 
'LIVEWIRE?''s Avatar
 
Join Date: Mar 2006
Location: N.W. Oxfordshire(Chipping Norton)
Posts: 7,306
Default Re: Sharp Stereo Ensemble (Troika) Model-GPS-525

The wording 'Troika 525 - High Fidelity Stereo Phonograph' suggests that it was made for the American Market, as does the fact that the radio only has MW (Wot No FM?!)
'LIVEWIRE?' is offline  
Old 19th Sep 2017, 12:16 am   #9
ben
Dekatron
 
ben's Avatar
 
Join Date: Aug 2006
Location: Madrid, Spain / Wirral, UK
Posts: 7,484
Default Re: Sharp Stereo Ensemble (Troika) Model-GPS-525

Quote:
Originally Posted by Andrew2 View Post
I like that, the style appeals to me. The innards look pretty sloppily assembled though, not unlike some Russian stuff from the late 60's.
Totally agree. The record deck looks like what you would find in a budget suitacase portable player rather than a system like this. Love the cabinet though!
__________________
Regards,
Ben.
ben is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 9:30 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.