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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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16th Sep 2017, 2:29 pm | #1 |
Hexode
Join Date: Jun 2013
Location: Norwich, Norfolk, UK.
Posts: 281
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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.
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Now where did I put that part again!!! |
16th Sep 2017, 2:49 pm | #2 |
Dekatron
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 9,427
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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.
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Frank |
16th Sep 2017, 2:50 pm | #3 |
Hexode
Join Date: Jun 2013
Location: Norwich, Norfolk, UK.
Posts: 281
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Re: Sharp Stereo Ensemble (Troika) Model-GPS-525
yes just MW
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Now where did I put that part again!!! |
16th Sep 2017, 3:00 pm | #4 |
Dekatron
Join Date: Sep 2015
Location: Southwold, Suffolk, UK.
Posts: 8,302
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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.
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Edward. |
16th Sep 2017, 3:38 pm | #5 |
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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.
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16th Sep 2017, 3:49 pm | #6 |
Nonode
Join Date: Mar 2010
Location: Dukinfield, Cheshire, UK.
Posts: 2,034
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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.
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Andy G1HBE. |
16th Sep 2017, 4:07 pm | #7 |
Dekatron
Join Date: May 2008
Location: Derby, UK.
Posts: 7,735
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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.
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16th Sep 2017, 6:40 pm | #8 |
Rest in Peace
Join Date: Mar 2006
Location: N.W. Oxfordshire(Chipping Norton)
Posts: 7,306
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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?!)
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19th Sep 2017, 12:16 am | #9 |
Dekatron
Join Date: Aug 2006
Location: Madrid, Spain / Wirral, UK
Posts: 7,484
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Re: Sharp Stereo Ensemble (Troika) Model-GPS-525
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!
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Regards, Ben. |