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Old 30th Aug 2019, 6:17 pm   #1
muradbatal
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Default Help...Grundig radio 1954 details needed.

Dear all,
I am glad to be here and it’s my first post. I hope I will find a help here.
My Dad has kindly gave me his family 1954 Grundig radio. It was purchased by his older brother on the same year in Amman-Jordan. No I brought here to London and I want to repair and restore it. My experience in this is none, and the problem additionally that the board on the back of the radio has lost. Form initial research I understood that specifications of the raid (electricity, model...etc) usually can be found on the back of that board.
I am seeking these information to know the model and specifications so I can start the journey I restoring it.
I have attached pictures of the radio and I will be really grateful if If anyone can help with more indie and guidance on spare parts and tips.
Many thanks
Murad
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Old 30th Aug 2019, 7:01 pm   #2
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Default Re: Help...Grundig radio 1954 details needed.

A clearer brighter picture looking inside the back might help, as would a list of the valve type numbers.

Do the valve types begin with E or U? I can't actually see a mains transformer nor a dropper resistor but it could have neither if it was designed to run on 110-120V mains. What was the supply voltage in Amman back in the mid '50s?

There are a lot of similar looking sets in the 1951-1954 manufacture date range in Radiomuseum. The closest looking one I found is here:

https://www.radiomuseum.org/r/grundig_945gwx945_gw.html

but it looks to have a different mains supply connection (no two pin connector). This may simply be a local variation, but does the valve lineup match?
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Old 30th Aug 2019, 7:57 pm   #3
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Default Re: Help...Grundig radio 1954 details needed.

Could it be the DK**, DF** etc valved version:

https://www.radiomuseum.org/r/grundig_945_bx.html

The valve in the OP's photo's looks 1.4v B7G to me.

Lawrence.
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Old 31st Aug 2019, 2:02 am   #4
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Default Re: Help...Grundig radio 1954 details needed.

I reckon Lawrence has nailed it (again)!


That plug on the lead looks like a battery one. I wonder if the set ever had a back panel- it doesn't look like there's room for the battery inside.
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Old 31st Aug 2019, 11:06 am   #5
muradbatal
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Default Re: Help...Grundig radio 1954 details needed.

Thank you very much for your help...
Like the UK they use 220 in Amman since then. The radio came with transformer (pic attached) but I left it back as it was too heavy and I think new models will be lighter. I also attached the bulb pic which I learnt is the valve or I assume that. It’s starts with DL94..
Thank you again!
Murad
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Old 31st Aug 2019, 11:08 am   #6
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Default Re: Help...Grundig radio 1954 details needed.

There seem to be four screw heads in the positions where one would expect to find them for holding on a back cover.
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Old 31st Aug 2019, 4:52 pm   #7
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Default Re: Help...Grundig radio 1954 details needed.

That valve is one of the four expected in the battery version of the set that Lawrence identified.

The "transformer" you left behind is actually a battery eliminator unit to allow this battery set to be powered from the mains. It could be a Grundig original part or an aftermarket unit.

In order to power the set now you will need either to make up a battery pack yourself (the original type is no longer manufactured) from 10 PP3 type batteries (the type commonly used in smoke alarms these days) in series to provide the 90V high tension supply plus an alkaline D cell to provide the 1.5V low tension supply, or to make or buy a suitable battery eliminator. There are suitable ones available commercially, but they're specialist limited production units and not particularly cheap.

Whatever you do, DON'T get the HT and LT supplies to the set mixed up. That's instant death to all the valves which are otherwise quite likely to be OK unless they look milky inside from air getting into the vacuum.

There are other relatively cheap bits which will need to be replaced before powering it up anyway and one quite expensive part (the transformer on the radio chassis) which needs to be checked in case the aforementioned cheap parts have already failed and killed it.

Keep coming back with questions if you do want to restore it yourself and do have a read of the information here:

http://www.vintage-radio.com/repair-...ion/index.html


Don't get disheartened though, any set is fixable, most without too much difficulty or expense.
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Old 31st Aug 2019, 7:35 pm   #8
muradbatal
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Default Re: Help...Grundig radio 1954 details needed.

Herald and all.

Thank you very much for these tips and advice. I will bring the battery then. I asked my parents not to throw it away. I will be coming back every time I got stuck which I believe will be very often

Keep you posted...

Many thanks, Murad.
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Old 10th Sep 2019, 12:20 pm   #9
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Default Re: Help...Grundig radio 1954 details needed.

Hello again,
The battery is here now...but I’ve still confused and your help is much appreciated. Why it does have two cords in and out? Which one should I use? Also on the battery there two out comes 110 and 220...
Apology, this must be very basic questions for you here.
Many thanks
Murad
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Old 15th Sep 2019, 5:31 pm   #10
muradbatal
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Default Re: Help...Grundig radio 1954 details needed.

Quote:
Originally Posted by Herald1360 View Post
That valve is one of the four expected in the battery version of the set that Lawrence identified.

The "transformer" you left behind is actually a battery eliminator unit to allow this battery set to be powered from the mains. It could be a Grundig original part or an aftermarket unit.

In order to power the set now you will need either to make up a battery pack yourself (the original type is no longer manufactured) from 10 PP3 type batteries (the type commonly used in smoke alarms these days) in series to provide the 90V high tension supply plus an alkaline D cell to provide the 1.5V low tension supply, or to make or buy a suitable battery eliminator. There are suitable ones available commercially, but they're specialist limited production units and not particularly cheap.

Whatever you do, DON'T get the HT and LT supplies to the set mixed up. That's instant death to all the valves which are otherwise quite likely to be OK unless they look milky inside from air getting into the vacuum.

There are other relatively cheap bits which will need to be replaced before powering it up anyway and one quite expensive part (the transformer on the radio chassis) which needs to be checked in case the aforementioned cheap parts have already failed and killed it.

Keep coming back with questions if you do want to restore it yourself and do have a read of the information here:

http://www.vintage-radio.com/repair-...ion/index.html


Don't get disheartened though, any set is fixable, most without too much difficulty or expense.
Hello again,
The battery is here now...but I’ve still confused and your help is much appreciated. Why it does have two cords in and out? Which one should I use? Also on the battery there two out comes 110 and 220...
Apology, this must be very basic questions for you here.
Many thanks
Murad
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Old 20th Sep 2019, 2:43 pm   #11
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Default Re: Help...Grundig radio 1954 details needed.

Take care with this unit - its wiring looks confusing!

As a first point I would expect the 110 and 220 to be INPUTS from the AC mains electricity supply. Could you confirm that Amman once had 110V as its mains voltage perhaps changing to 220V in more recent times?
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Old 21st Sep 2019, 1:05 am   #12
muradbatal
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Default Re: Help...Grundig radio 1954 details needed.

Quote:
Originally Posted by SteveCG View Post
Take care with this unit - its wiring looks confusing!

As a first point I would expect the 110 and 220 to be INPUTS from the AC mains electricity supply. Could you confirm that Amman once had 110V as its mains voltage perhaps changing to 220V in more recent times?
Thank you for your input. What I understood it’s always been 220 in Amman.
Many thx
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Old 21st Sep 2019, 9:39 am   #13
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Default Re: Help...Grundig radio 1954 details needed.

There seems to be a 2 pin socket on the battery eliminator with a corresponding 2 pin plug on the back of the radio (HT?). Also is there a 4 pin socket on the back right hand side of the radio chassis to correspond with the plug on the eliminator, possibly the heater supply?

I think that the eliminator will need restoration before anything else! A fascinating project if the OP is able to proceed with it with help from here.

EDIT - I have just re read the thread and seen Chris's remark about the lead on the set which I hadn't noticed - it makes the connections on the eliminator more confusing!. If the two pin plug/socket was for HT you would have to be very careful to get it the right way round!
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Old 21st Sep 2019, 10:21 am   #14
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Default Re: Help...Grundig radio 1954 details needed.

The two pin socket/plug is connected to the on/off switch in the receiver (the receivers on/off switch is a 3 pole single throw job...one for the heaters, one for HT and one for the eliminator) The receivers on/off switch switches the AC feed to the eliminator on and off, the flying two pin socket attached to the eliminator is mains out from the eliminator on one and switched mains back in (via the receiver) on the other which goes to the eliminators mains transformer....So far as I can make out.

Lawrence.

Last edited by ms660; 21st Sep 2019 at 10:34 am.
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Old 21st Sep 2019, 11:59 am   #15
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Default Re: Help...Grundig radio 1954 details needed.

So the eliminator is, in fact, an "integral" part of the set? Not literally integral of course.
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Old 21st Sep 2019, 12:43 pm   #16
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Default Re: Help...Grundig radio 1954 details needed.

This sort of thing, haven't shown the 110/220v arrangement because from the photo's I'm not sure what's what in that department.

Lawrence.
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Old 21st Sep 2019, 1:08 pm   #17
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Default Re: Help...Grundig radio 1954 details needed.

Interesting, thank you
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Old 21st Sep 2019, 7:32 pm   #18
muradbatal
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Default Re: Help...Grundig radio 1954 details needed.

Brilliant! Many thx all...I really appreciate your help.
I will keep you posted how this goes...
Best
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Old 21st Sep 2019, 7:36 pm   #19
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Default Re: Help...Grundig radio 1954 details needed.

Don't be tempted to plug anything into the mains without more guidance. It might go off with a bang, or at least damage difficult to replace components
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Old 21st Sep 2019, 7:56 pm   #20
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Default Re: Help...Grundig radio 1954 details needed.

I didn't draw the socket on the eliminator, I'll post an amended drawing tomorrow.

Lawrence.
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