Roberts 29806 radio 1945-50 era - UK Vintage Radio Repair and Restoration Discussion Forum

bill knox · 14th Mar 2018, 6:28 pm

Hi

A neighbour has brought across to me a Roberts 29806 radio ( I think 29806 is the model number) that is a battery only radio, I think it dates around about 1945-50, it has 4 valves, DK32, DF33, DAC32 and a DL35, I believe that the battery is or was a 90Volt + 1.5 Volt.

Would any of our readers have a circuit for the radio and also a circuit for a "battery eliminator" that either fits that particular radio or one that could be modified to work on it.

Many thanks

Bill

Nuvistor · 14th Mar 2018, 6:48 pm

That doesn’t appear to be a Roberts radio model number, I could be wrong of course. Some photos of the set and chassis may confirm a model number.

Paul_RK · 14th Mar 2018, 6:59 pm

Sounds like the serial number from the control panel under the lid, within the expected range for a P4D which the valves would also suggest. The Trader sheet is on Paul's disc, or £1.99 to download from top right of this page.

ms660 · 14th Mar 2018, 6:59 pm

This one has the same valve line up:

https://www.radiomuseum.org/r/roberts_p4dp_4.html

EDIT: Post crossed.

Lawrence.

Nuvistor · 14th Mar 2018, 7:03 pm

Trader sheet for the P4D
https://www.service-data.com/section.php/7330/1/p4d

bill knox · 14th Mar 2018, 8:02 pm

Hi

Yes, that looks like its the one many thanks.

What I am possibly going to do now is to make a battery eliminator, I have found a circuit and it will depend on if the neighbour wants to go ahead.

Thank you for the very quick replies.

Regards

Bill

Nuvistor · 14th Mar 2018, 8:25 pm

A word of caution about the heaters in the valve, they are 50ma they will be quite fragile (DL32 100ma) and easily damaged by overload.
Perhaps worth testing the radio with a 1.5 volt battery for the heaters, the 90 volts can be made from 10 cheap PP3 batteries.
May as well do initial testing and repair from a known power source.

14th Mar 2018, 6:28 pm	#1
bill knox Hexode Join Date: Mar 2011 Location: Wilstead, Bedfordshire, UK. Posts: 367	Roberts 29806 radio 1945-50 era Hi A neighbour has brought across to me a Roberts 29806 radio ( I think 29806 is the model number) that is a battery only radio, I think it dates around about 1945-50, it has 4 valves, DK32, DF33, DAC32 and a DL35, I believe that the battery is or was a 90Volt + 1.5 Volt. Would any of our readers have a circuit for the radio and also a circuit for a "battery eliminator" that either fits that particular radio or one that could be modified to work on it. Many thanks Bill

14th Mar 2018, 6:48 pm	#2
Nuvistor Dekatron Join Date: Aug 2013 Location: Wigan, Greater Manchester, UK. Posts: 9,433	Re: Roberts 29806 radio 1945-50 era That doesn’t appear to be a Roberts radio model number, I could be wrong of course. Some photos of the set and chassis may confirm a model number. __________________ Frank

14th Mar 2018, 6:59 pm	#3
Paul_RK Dekatron Join Date: Nov 2003 Location: Fakenham, Norfolk, UK. Posts: 4,259	Re: Roberts 29806 radio 1945-50 era Sounds like the serial number from the control panel under the lid, within the expected range for a P4D which the valves would also suggest. The Trader sheet is on Paul's disc, or £1.99 to download from top right of this page.

14th Mar 2018, 6:59 pm	#4
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Roberts 29806 radio 1945-50 era This one has the same valve line up: https://www.radiomuseum.org/r/roberts_p4dp_4.html EDIT: Post crossed. Lawrence.

14th Mar 2018, 7:03 pm	#5
Nuvistor Dekatron Join Date: Aug 2013 Location: Wigan, Greater Manchester, UK. Posts: 9,433	Re: Roberts 29806 radio 1945-50 era Trader sheet for the P4D https://www.service-data.com/section.php/7330/1/p4d __________________ Frank

14th Mar 2018, 8:02 pm	#6
bill knox Hexode Join Date: Mar 2011 Location: Wilstead, Bedfordshire, UK. Posts: 367	Re: Roberts 29806 radio 1945-50 era Hi Yes, that looks like its the one many thanks. What I am possibly going to do now is to make a battery eliminator, I have found a circuit and it will depend on if the neighbour wants to go ahead. Thank you for the very quick replies. Regards Bill

14th Mar 2018, 8:25 pm	#7
Nuvistor Dekatron Join Date: Aug 2013 Location: Wigan, Greater Manchester, UK. Posts: 9,433	Re: Roberts 29806 radio 1945-50 era A word of caution about the heaters in the valve, they are 50ma they will be quite fragile (DL32 100ma) and easily damaged by overload. Perhaps worth testing the radio with a 1.5 volt battery for the heaters, the 90 volts can be made from 10 cheap PP3 batteries. May as well do initial testing and repair from a known power source. __________________ Frank