I brought an unknown Radiogram, no logo or any indication what brand it is, but from the Forms here and eles where, all the indication is its an Astor possible an NL .The only problem is the rectifier which is a 5AS4.The present line up as I got it is,6AN7 ,6U7G ,6B6G, 6v6GT and a 5AS4, Ive recapped and internals are in pristine condition. Sound is Great. But the transformer seems to get too warm after short period. I havent been able to find any Radiograms so far that use this valve, Does anyone know if this was used in the early 1950s?and am thinking maybe its been replaced it for a 5y3GT. As I'm not 100% sure what Make or Model it is , I thought id put it out there incase anyone knows,Thanks

5AS4 was used as a rectifier in TV sets.

It has the same connections as a 5Y3GT, so by all means put a 5Y3 in.

The 5AS4 filament (from memory) takes twice as much power as the 5Y3, so the transformer will get hotter.

Thanks Robbbert, Yes. that makes better sense.Coincidence, about 6 months ago , I brought a similar unit for parts just for the collard turntable, The 5AS4 was also in that one, the transformer had burnt out,at some stage,i guess its no wonder,sucking the power up,Thanks again

5AS4 rectifiers were not used in domestic radio or radiograms that I know of. A 5AS4 draws a third more filament current than a 5Y3GT & could very likely put a strain on the power transformer.

The Astor NL uses a GN chassis and the converter valve was originally a 6J8GA. Later versions of the GN uses a 6AN7 or X79 for the converter. Another version uses a 6AV6 in place the 6B6G. All the other valves mentioned, including the 5Y3GT, are the same.

Hi Monochrome TV, besides it just doesent look like it belongs,Swaped it over ,Transformer running cool, big difference,Sorted that one out thanks.Anyone after a couple of 5AS4 , look ok, free to a good home.