UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - How much current should a Marconi DER valve pass ?

GrimJosef · 27th Nov 2017, 7:29 pm

Thanks very much for that Lawrence.

I went back out to the workshop, raised the filament voltage to the full 2.0V, grounded the grid and took the HT up to 80V. The graph in W.W. (their Fig 2) says that you'd expect about 2.7mA under those conditions. I measured 2.44mA so my valve is actually running at 90% of theirs, which is very pleasing after rather more than 90 years

!

Cheers,

GJ

27th Nov 2017, 7:29 pm	#3
GrimJosef Dekatron Join Date: Sep 2007 Location: Oxfordshire, UK. Posts: 4,311	Re: How much current should a Marconi DER valve pass ? Thanks very much for that Lawrence. I went back out to the workshop, raised the filament voltage to the full 2.0V, grounded the grid and took the HT up to 80V. The graph in W.W. (their Fig 2) says that you'd expect about 2.7mA under those conditions. I measured 2.44mA so my valve is actually running at 90% of theirs, which is very pleasing after rather more than 90 years ! Cheers, GJ __________________ http://www.ampregen.com