Kosmophon Radio. - UK Vintage Radio Repair and Restoration Discussion Forum

nikos_ngr · 26th Jun 2009, 8:07 pm

Hello guys! I am writing you from Greece.
I have a vintage radio witch fabricated at late 1950’s.
I have already changed many capacitors ant resistors and now it’s working.
The problem that I have now is that in full open sound I can hear a radio station bat very very low.
Is somebody here that knows something?

And it is possible to found any manual for that radio.

Thank you!!!

Steve_P · 26th Jun 2009, 8:34 pm

Never heard of that make.

Anyway, check all your work to make sure of values and connections. Then tell us the valve voltages and types of valve.

Cheers,

Steve P.

Herald1360 · 26th Jun 2009, 9:30 pm

Single ended tubular octals with a 6V6 at the end of the line might be 6SA7, 6SK7, 6SQ7 plus rectifier. Looks like a fairly standard sort of line up, but I would expect it to be earlier than late fifties- late forties more like.

There might be some relevant stuff on this forum: http://www.hlektronika.gr/forum/showthread.php?t=45914

The thread appears to be discussing a later model Kosmophon with B8A valves; the forum looks rather like a Greek version of this one!

Chris

nikos_ngr · 29th Jun 2009, 7:43 pm

Herald1360 the forum that you found has mine stuff…

Surely is a Greek version maybe in late forties but I don’t know. It doesn’t has something on it. Any way

The valves that it has are : torvac 6X5GT , KEN-RAD JAN-CKR-6V6 , NU 6SQ GT, FIVERE 6SA7 GT, FIVERE maybe the same value with the fist…

Herald1360 · 30th Jun 2009, 12:27 pm

That was a lucky guess, then......

6X5 is the rectifier, 6V6 is output stage, 6SQ7 is (2nd) detector and 1st AF stage, Not sure what you mean by "maybe the same value with the fist…", but there's not too many types it could be other than 6SK7 for the IF stage in this lineup, 6SA7 is the frequency changer (mixer, 1st detector) stage.

I hope someone else with a servicing background may be able to help now with your faultfinding- my knowledge is a bit sketchy to be of direct help with that.

Chris

Steve_P · 30th Jun 2009, 2:51 pm

First, make sure the valves are in the right places!

Right - Do the valves light up? All of them? Probably they do, but always check.

Check the voltages on the heaters of the valves against a good data book. And the anodes etc too.

It should have AC on both the anodes of the Rectifier and there should be about 250v on the cathode.

If you've changed so many bits and not tested it after each one, check soldering, all OK, soldered on the right places and all values.

Try realigning the IF and RF as well as possible and put an aerial on it. See what happens then.

Cheers,

Steve P.

peter_sol · 30th Jun 2009, 4:18 pm

Hi

It will need an aerial

(a long piece of wire) as that is what it was designed for

Regards

Peter.

nikos_ngr · 2nd Jul 2009, 9:57 pm

Herald1360 I just can’t read the value of the tube but you may be found it…

I found an i paper called Handbook Tubes 12th edition 1966 and there I saw all the tubes and schematics…

I believe that it will helps…
But I want to ask something. To measure the voltage values in each tube I mast measure in ac or dc

And the red wire of mine multimeter will be in one pole of the tube. The other? In ground?( chassis)

Steve_P · 2nd Jul 2009, 10:30 pm

Switch to DC. Black lead to Chassis.

Switch to 1000v and red lead on the valve pin. Go down on the setting on the meter if the reading is low.

Post them here.

Cheers,

Steve P.

nikos_ngr · 3rd Jul 2009, 3:37 pm

I found the problem!!! I wasn’t changed the ac wire… I’ve changed that and I put and a ground to the chassis… After this the radio with a small aerial works perfect!!! I found channels in 1 band (because of the aerial) and the next step is to paint it again and place it to it’s box!!!!
Thank you very much because from your forum I found many useful data!!!
Cheers ,
Nick NGr

Jimmyhaflinger · 10th Jul 2009, 1:07 am

Europhon, an Italian manufacturer, used the Kosmophon brand from the late 50s to the mid 80s on some variants of its products, this radio looks older though.

26th Jun 2009, 8:07 pm	#1
nikos_ngr Retired Dormant Member Join Date: Jun 2009 Location: Athens, Greece. Posts: 4	Kosmophon Radio. Hello guys! I am writing you from Greece. I have a vintage radio witch fabricated at late 1950’s. I have already changed many capacitors ant resistors and now it’s working. The problem that I have now is that in full open sound I can hear a radio station bat very very low. Is somebody here that knows something? And it is possible to found any manual for that radio. Thank you!!! Attached Thumbnails

26th Jun 2009, 8:34 pm	#2
Steve_P Dekatron Join Date: Sep 2003 Location: Bolton, Greater Manchester, UK. Posts: 6,644	Re: Kosmophon Radio. Never heard of that make. Anyway, check all your work to make sure of values and connections. Then tell us the valve voltages and types of valve. Cheers, Steve P. __________________ If we've always had it, why is the Car Boot open? You're not sneaking another Old TV in are you...?

26th Jun 2009, 9:30 pm	#3
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,536	Re: Kosmophon Radio. Single ended tubular octals with a 6V6 at the end of the line might be 6SA7, 6SK7, 6SQ7 plus rectifier. Looks like a fairly standard sort of line up, but I would expect it to be earlier than late fifties- late forties more like. There might be some relevant stuff on this forum: http://www.hlektronika.gr/forum/showthread.php?t=45914 The thread appears to be discussing a later model Kosmophon with B8A valves; the forum looks rather like a Greek version of this one! Chris

29th Jun 2009, 7:43 pm	#4
nikos_ngr Retired Dormant Member Join Date: Jun 2009 Location: Athens, Greece. Posts: 4	Re: Kosmophon Radio. Herald1360 the forum that you found has mine stuff… Surely is a Greek version maybe in late forties but I don’t know. It doesn’t has something on it. Any way The valves that it has are : torvac 6X5GT , KEN-RAD JAN-CKR-6V6 , NU 6SQ GT, FIVERE 6SA7 GT, FIVERE maybe the same value with the fist…

30th Jun 2009, 12:27 pm	#5
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,536	Re: Kosmophon Radio. That was a lucky guess, then...... 6X5 is the rectifier, 6V6 is output stage, 6SQ7 is (2nd) detector and 1st AF stage, Not sure what you mean by "maybe the same value with the fist…", but there's not too many types it could be other than 6SK7 for the IF stage in this lineup, 6SA7 is the frequency changer (mixer, 1st detector) stage. I hope someone else with a servicing background may be able to help now with your faultfinding- my knowledge is a bit sketchy to be of direct help with that. Chris

30th Jun 2009, 2:51 pm	#6
Steve_P Dekatron Join Date: Sep 2003 Location: Bolton, Greater Manchester, UK. Posts: 6,644	Re: Kosmophon Radio. First, make sure the valves are in the right places! Right - Do the valves light up? All of them? Probably they do, but always check. Check the voltages on the heaters of the valves against a good data book. And the anodes etc too. It should have AC on both the anodes of the Rectifier and there should be about 250v on the cathode. If you've changed so many bits and not tested it after each one, check soldering, all OK, soldered on the right places and all values. Try realigning the IF and RF as well as possible and put an aerial on it. See what happens then. Cheers, Steve P. __________________ If we've always had it, why is the Car Boot open? You're not sneaking another Old TV in are you...?

30th Jun 2009, 4:18 pm	#7
peter_sol Octode Join Date: Aug 2003 Location: Welwyn Garden City, Herts. UK. Posts: 1,906	Re: Kosmophon Radio. Hi It will need an aerial (a long piece of wire) as that is what it was designed for Regards Peter.

2nd Jul 2009, 9:57 pm	#8
nikos_ngr Retired Dormant Member Join Date: Jun 2009 Location: Athens, Greece. Posts: 4	Re: Kosmophon Radio. Herald1360 I just can’t read the value of the tube but you may be found it… I found an i paper called Handbook Tubes 12th edition 1966 and there I saw all the tubes and schematics… I believe that it will helps… But I want to ask something. To measure the voltage values in each tube I mast measure in ac or dc And the red wire of mine multimeter will be in one pole of the tube. The other? In ground?( chassis)

2nd Jul 2009, 10:30 pm	#9
Steve_P Dekatron Join Date: Sep 2003 Location: Bolton, Greater Manchester, UK. Posts: 6,644	Re: Kosmophon Radio. Switch to DC. Black lead to Chassis. Switch to 1000v and red lead on the valve pin. Go down on the setting on the meter if the reading is low. Post them here. Cheers, Steve P. __________________ If we've always had it, why is the Car Boot open? You're not sneaking another Old TV in are you...?

3rd Jul 2009, 3:37 pm	#10
nikos_ngr Retired Dormant Member Join Date: Jun 2009 Location: Athens, Greece. Posts: 4	Re: Kosmophon Radio. I found the problem!!! I wasn’t changed the ac wire… I’ve changed that and I put and a ground to the chassis… After this the radio with a small aerial works perfect!!! I found channels in 1 band (because of the aerial) and the next step is to paint it again and place it to it’s box!!!! Thank you very much because from your forum I found many useful data!!! Cheers , Nick NGr

10th Jul 2009, 1:07 am	#11
Jimmyhaflinger Heptode Join Date: Feb 2007 Location: La Spezia, Italy Posts: 834	Re: Kosmophon Radio. Europhon, an Italian manufacturer, used the Kosmophon brand from the late 50s to the mid 80s on some variants of its products, this radio looks older though.