1920s Mystery radio challenge. - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

Boater Sam · 29th Apr 2017, 4:54 pm

Henk, what valves are in your set?
Is it a battery set with a battery eliminator powering it up?
There is one like this on the Radiomuseum site.

henk oudenampse · 30th Apr 2017, 7:27 am

Hi Paul.

The valves in my set are: MP13, PM4DX and a PM25. It is not a battery set with a battery eliminator. It can only works on DC.

Henk.

Boater Sam · 30th Apr 2017, 10:58 pm

That sounds like yet another model than the ones so far seen.
Can you do some photos for us please and maybe send it up the Radiomuseum as well?
If it is DC only, what arrangement is there for the 3 grid bias voltages or are the valves auto biased?

29th Apr 2017, 4:54 pm	#21
Boater Sam Banned Join Date: Dec 2013 Location: Middlewich, Cheshire, UK. & Winter in the Philippines. Posts: 3,897	Re: 1920s Mystery radio challenge. Henk, what valves are in your set? Is it a battery set with a battery eliminator powering it up? There is one like this on the Radiomuseum site.

30th Apr 2017, 7:27 am	#22
henk oudenampse Retired Dormant Member Join Date: Apr 2017 Location: Borculo, Netherlands Posts: 3	Re: 1920s Mystery radio challenge. Hi Paul. The valves in my set are: MP13, PM4DX and a PM25. It is not a battery set with a battery eliminator. It can only works on DC. Henk.

30th Apr 2017, 10:58 pm	#23
Boater Sam Banned Join Date: Dec 2013 Location: Middlewich, Cheshire, UK. & Winter in the Philippines. Posts: 3,897	Re: 1920s Mystery radio challenge. That sounds like yet another model than the ones so far seen. Can you do some photos for us please and maybe send it up the Radiomuseum as well? If it is DC only, what arrangement is there for the 3 grid bias voltages or are the valves auto biased?