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Old 28th Nov 2017, 8:11 am   #1
babuni81
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Default Telerad D 2642 WK Radio. India.

I am having This radio. Telerad. 1960's Can any one provide the original schematic diagram of this radio set. It has been altered many times so I like to bring it in original condition. Manufactured in India Bombay.
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Old 28th Nov 2017, 8:56 am   #2
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Default Re: Telerad Radio india.

Is there an identification label or plate on the inside/back that provides a model number?
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Old 28th Nov 2017, 9:42 am   #3
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Default Re: Telerad Radio india.

This very radio has featured here before:-

https://vintage-radio.net/forum/showthread.php?t=119915

There's a similar on here:-

http://antiqueradios.com/forums/view...p?f=1&t=281794

Telerad appears to have been unique to India and I doubt very much that service information is available
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Old 28th Nov 2017, 10:12 am   #4
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Default Re: Telerad Radio india.

The front panel layout is similar to a number of Philips India models.

For example:-

https://www.radiomuseum.org/r/philips_b6ca65a.html
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Old 28th Nov 2017, 12:03 pm   #5
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Default Re: Telerad Radio india.

Could be of German origin. Note the K1, K2, K3, above the keyswitches. Kurzwellen?
Also the appearance is very much late 50's /early 60's German styling.
Just a thought.. Tony
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Old 28th Nov 2017, 1:21 pm   #6
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Default Re: Telerad Radio india.

This is the back cover Photo Model No D 2642WK .
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Old 28th Nov 2017, 1:31 pm   #7
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Default Re: Telerad Radio india.

Some possible info on the company here: https://indiankanoon.org/docfragment...mInput=telerad
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Old 28th Nov 2017, 2:00 pm   #8
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Default Re: Telerad Radio india.

I've put a request up on Electrotanya, may get lucky.
With the valve lineup listed it will be fairly standard circuit.
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Old 28th Nov 2017, 7:30 pm   #9
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Default Re: Telerad Radio India.

I too think it has a Philips heritage. The aerial sybmbol is European and looking at the loudspeaker, which can just be seen and the control layout of a Philips Jupiter, in which the bass and treble controls are placed in an identical position, gives a clue.
Whilst the Telerad is not a Jupiter, a photo of the inside of the radio and maybe underneath components will help no end.
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Old 29th Nov 2017, 5:29 am   #10
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Default Re: Telerad Radio India.

The valve Line up are as follows : EM84 -ECH81 -EF89- EBC81 -EL84- EZ80.

one thing is new which was added later but failed some technician tried to replace normal antenna coil with ferrite rod so the Ferrite rod holder was not there in the original set.and not it is useless. So ignore that part.
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Old 29th Nov 2017, 5:41 am   #11
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Default Re: Telerad Radio India.

It may look like Philips but the internal circuit is different from Philips radios. Actually I need the original schematic so that I can restore it as original one. All parts are fine but internal circuits are a bit hazardous. IFT's are ok All valves are fine. Transformer mains output all are working but bass trebles are not as internal circuit is been tortured by some technicians long back ago may be. Its a set of my father inherited by me.
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Old 29th Nov 2017, 10:06 am   #12
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Default Re: Telerad Radio India.

Is that a Philips/Sobell/Stellar style power plug and voltage selector? Or was it used by others too?
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Old 29th Nov 2017, 11:04 am   #13
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Default Re: Telerad Radio India.

More info about (literally) the same set on a Dutch forum, where someone's IDd an Indian Philips which seems very similar...

http://www.gloeidraad.nl/radioforum/...read&id=244650
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Old 29th Nov 2017, 12:33 pm   #14
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Default Re: Telerad D 2642 WK Radio. India.

The IF transformers tell all. This is not a Philips clone. Similar transformers were used by PYE but the mounting is different. With PYE, a thredded eyelet is used to secure the can to the chassis. From what I can see, the can itself is formed and threaded.
The use of an EM84 dates the set to 1959 onwards although it was designed for FM radios & tape recorders Unitra used them in AM only radios.
The valve makes might help. I would imagine even if the radio has been got at, the EM84 could be original. Who made it? Are different makes used elsewhere, a clue here?
Last but not least, what does the underneath show? Hunts or Wima capacitors or local manufacture, putting my Shelock Holmes hat on, might be another avenue to take.

Chris
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Old 29th Nov 2017, 1:22 pm   #15
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Default Re: Telerad D 2642 WK Radio. India.

That looks like a Philips speaker in it.

Martin
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Old 29th Nov 2017, 4:06 pm   #16
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Default Re: Telerad D 2642 WK Radio. India.

no, in built speaker is not a Philips speaker.

I got the schematic of Telerad Pvt Ltd Bombay India D 2633 WK. This has a single tone control many similarities are there with my set. However if any one find D 2642 WK please inform me.
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Old 30th Nov 2017, 3:39 am   #17
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Default Re: Telerad Radio India.

Quote:
Originally Posted by Nickthedentist View Post
More info about (literally) the same set on a Dutch forum, where someone's IDd an Indian Philips which seems very similar...

http://www.gloeidraad.nl/radioforum/...read&id=244650
In that thread, I established that the set has likely nothing to do with Philips and may have some resemblance to Telefunken sets (the type number sure does).

P.S. The loudspeaker is the only part that looks Philips-like, what is the printing on it?
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Old 30th Nov 2017, 9:10 am   #18
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Default Re: Telerad D 2642 WK Radio. India.

Telefunken? I'm not sure, the original build quality is difficult to assess with obvious bodges seen on the photograph. By the way, where is the mains transformer and what does it look like?

I can't find any reference to Telefunken having an Indian presence unlike Philips whose Calcutta office is on record.

Lastly, whilst I said that the IF transformers could not possibly be Philips, lo and behold back in 1948 they were very similar to the ones shown however, the screening cans lifted away from the chassis is not the way you would expect manufacturing from a engineering company.

If possible, why don't you post the schematic on this site and perhaps not only will it be possible to advise on the tone control circuit but other clues as to the house style design team will become apparent.

Chris
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Old 2nd Dec 2017, 5:51 am   #19
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Default Re: Telerad D 2642 WK Radio. India.

The fact this IFT's outer can condition is not good so it is fitted differently by some technician. It is not factory fitted like that.However its working fine internally.
I am giving here the schematic I got of Telerad Pvt Ltd. Model D 2633 WK which I have with me. But my one is D 2642 WK. My one has separate bass and treble control however output transformer is changed long ago replaced by Philips one. Also sharing you photos of Transformer and chassis underneath. This schematic has 90% similarity with my only difference is. It has single tone control my one is separate bass and treble control and Its has 3 band, my one is 4 band. If you can help me out by this schematic to manage separate bass treble control deriving from this circuit. Waiting for your suggestions.
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Last edited by babuni81; 2nd Dec 2017 at 5:53 am. Reason: Correction
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Old 3rd Dec 2017, 1:30 am   #20
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Default Re: Telerad D 2642 WK Radio. India.

Just a thought. Contact Muhammad Moinuddin who runs Mahboob Radio Repairs, 22-8-607 Chatta Bazaar Road, Hydrabad. Tel +(91)-40-24523514.

The shop have been repairing radios since 1935 and now specialise in obsolete radios. The shop may well have the schematic for your radio or can confirm the schematic you have is applicable to your radio.

Looking through various web sites, there are similarities to some European circuit schematics, such as the way mains and sound output transformers are shown with thick lines, valve and electrolytics though look like they were drawn in US and UK drawing offices respectively. Similarly, IF transformers are shown differently. A mix of different house styles me thinks.

European radios in the 50s included FM for home and export sales and whilst UK "export" radios to the world did not, having mw with short wave. A general look at the construction of your radio suggests it was designed in India.

Looking at the underneath of the radio, quite a lot of work has been undertaken and I would follow the wiring against the schematic you have noting the differences if any. After that, the rest is easy!!

Chris

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