DET1 Marconi dull emitter first valve with flat nickel plate Top Pip Holy Grail
DET1 Marconi Top Pip GBP 5,500 pair.
Description
The Marconi DET1 was first launched in 1924 and according to the MO-V literature it is considered the very first dull emitter valve made in the UK, having thoriated filament, it was used for airborne transmitting and later for public address use.
There are two versions of this stunning valve.
The DET1 Top Pip version you see here the first ever made of 1924 and the round top one you see on this website dated later than the Top Pip L4 base.
It is a 6 volts heater valve with a max Anode voltage of 1,000.
Amplification factor 11.
Mutual conductance 1.7.
The valve you see here are dated early 1930s.
Both in excellent shape and working order.
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