Radione R2 German radio 1939-42 - UK Vintage Radio Repair and Restoration Discussion Forum

sandbar40 · 5th May 2018, 12:36 am

Does anyone have a clear schematic for this, or can point to a website?
I've found a couple but too blurry.

ms660 · 5th May 2018, 2:41 pm

I'm looking at a copy from a French website, it's clear enough and the component values that are given can be read ok.

For me to post a live link to the site might be in breach of forum rules, maybe one of the MOD's could advise on that?

Lawrence.

AC/HL · 5th May 2018, 4:38 pm

B8 applies. It's quite clear, OK as long as it's not available here. If it is, the absolute minimum required to illustrate the problem can be extracted.
It has to be in the public domain, of course. Some sites don't allow it, Radiomuseum for instance.

ms660 · 5th May 2018, 4:42 pm

This should be ok then:

https://www.doctsf.com/documents/aff...5708&num_fic=1

Lawrence.

ms660 · 5th May 2018, 6:54 pm

There's another one here which shows the switchery a bit better:

www.georg-knoechel.de/radione-r2-standard-sp.jpg

Lawrence.

Herald1360 · 6th May 2018, 9:21 am

That's an interesting set. Looks like a top of the range portable for its day. Love that dinky double triode for push pull output!

https://www.doctsf.com/grandlivre/fi...icher_photos=0

sandbar40 · 6th May 2018, 10:57 am

Thanks, a couple of good schematics. Now all i have to do is find a suitable replacement power transformer. The radio is complete except no transformer! Must have failed at some time and been removed. I'll be looking for one to fit the rather small space with the correct secondary volts, but i guess only 220 volt primary.

ms660 · 6th May 2018, 4:47 pm

Looking at the schematic it looks to me as though the output valve bias source is changed between mains operation and battery operation, any idea why?

Lawrence.

ukcol · 6th May 2018, 5:03 pm

Perhaps the bias is optimised for performance on mains and economy (reduced current consumption) on battery?

ms660 · 6th May 2018, 5:40 pm

The bias voltage shown on the last schematic link I posted is given as -6.3 volts, for what I've assumed is the voltage when powered by the mains, on battery supply it seems that the bias voltage is due to the cathode of the output valve being connected to battery +ve and will be 6 volts so not a lot of difference initially, I might be up the wrong tree though with the switch interpretation.

Lawrence.

ms660 · 6th May 2018, 6:40 pm

Having looked again Colin I think you are right, the -6.3V given in this schematic:
www.georg-knoechel.de/radione-r2-standard-sp.jpg
looks like a modern annotation, possibly gotten from the EDD11 valve data for battery operation:
http://www.r-type.org/pdfs/edd11.pdf
that would make the cathode voltage correct when battery powered, and the -6.3V shown on the schematic as the bias voltage when mains powered wrong, summing up the currents given in the schematic suggests that also.

Lawrence.

Herald1360 · 6th May 2018, 6:44 pm

6V accumulator will be near enough 6.3V anyway. That's where 6.3 V originated in the first place.

5th May 2018, 12:36 am	#1
sandbar40 Tetrode Join Date: Mar 2010 Location: Tauranga, New Zealand Posts: 61	Radione R2 German radio 1939-42 Does anyone have a clear schematic for this, or can point to a website? I've found a couple but too blurry.

5th May 2018, 2:41 pm	#2
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Radione R2 German radio 1939-42 I'm looking at a copy from a French website, it's clear enough and the component values that are given can be read ok. For me to post a live link to the site might be in breach of forum rules, maybe one of the MOD's could advise on that? Lawrence.

5th May 2018, 4:38 pm	#3
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: Radione R2 German radio 1939-42 B8 applies. It's quite clear, OK as long as it's not available here. If it is, the absolute minimum required to illustrate the problem can be extracted. It has to be in the public domain, of course. Some sites don't allow it, Radiomuseum for instance.

5th May 2018, 4:42 pm	#4
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Radione R2 German radio 1939-42 This should be ok then: https://www.doctsf.com/documents/aff...5708&num_fic=1 Lawrence.

5th May 2018, 6:54 pm	#5
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Radione R2 German radio 1939-42 There's another one here which shows the switchery a bit better: www.georg-knoechel.de/radione-r2-standard-sp.jpg Lawrence.

6th May 2018, 9:21 am	#6
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,535	Re: Radione R2 German radio 1939-42 That's an interesting set. Looks like a top of the range portable for its day. Love that dinky double triode for push pull output! https://www.doctsf.com/grandlivre/fi...icher_photos=0 __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O

6th May 2018, 10:57 am	#7
sandbar40 Tetrode Join Date: Mar 2010 Location: Tauranga, New Zealand Posts: 61	Re: Radione R2 German radio 1939-42 Thanks, a couple of good schematics. Now all i have to do is find a suitable replacement power transformer. The radio is complete except no transformer! Must have failed at some time and been removed. I'll be looking for one to fit the rather small space with the correct secondary volts, but i guess only 220 volt primary.

6th May 2018, 4:47 pm	#8
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Radione R2 German radio 1939-42 Looking at the schematic it looks to me as though the output valve bias source is changed between mains operation and battery operation, any idea why? Lawrence.

6th May 2018, 5:03 pm	#9
ukcol Rest in Peace Join Date: May 2003 Location: Harlaxton, Lincolnshire, UK. Posts: 3,944	Re: Radione R2 German radio 1939-42 Perhaps the bias is optimised for performance on mains and economy (reduced current consumption) on battery?

6th May 2018, 5:40 pm	#10
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Radione R2 German radio 1939-42 The bias voltage shown on the last schematic link I posted is given as -6.3 volts, for what I've assumed is the voltage when powered by the mains, on battery supply it seems that the bias voltage is due to the cathode of the output valve being connected to battery +ve and will be 6 volts so not a lot of difference initially, I might be up the wrong tree though with the switch interpretation. Lawrence.

6th May 2018, 6:40 pm	#11
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Radione R2 German radio 1939-42 Having looked again Colin I think you are right, the -6.3V given in this schematic: www.georg-knoechel.de/radione-r2-standard-sp.jpg looks like a modern annotation, possibly gotten from the EDD11 valve data for battery operation: http://www.r-type.org/pdfs/edd11.pdf that would make the cathode voltage correct when battery powered, and the -6.3V shown on the schematic as the bias voltage when mains powered wrong, summing up the currents given in the schematic suggests that also. Lawrence.

6th May 2018, 6:44 pm	#12
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,535	Re: Radione R2 German radio 1939-42 6V accumulator will be near enough 6.3V anyway. That's where 6.3 V originated in the first place. __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O