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Telefunken / EF804S-TELEFUNKEN
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All prices contained on this page are exclusive of VAT. This is currently charged at 20% and is payable by the UK only.
All prices contained on this page are exclusive of VAT. This is currently charged at 20% and is payable by the UK only.
Telefunken was a German radio and television apparatus company, founded in Berlin in 1903, as a joint venture of Siemens & Halske and the Allgemeine Elektricitats-Gesellschaft (A.E.G).
In 1967 Telefunken were merged with AEG and the company renamed AEG-Telefunken.
In 1985 the Telefunken name was dropped. The Telefunken name is one we associate with rare and valuable valves which are some of the best sounding valves ever made.
The EF804S Telefunken is a classic and rare new old stock valve that was a specially made and selected by Telefunken for uses in high end electronics and studio equipment. The S meant factory selected for the best possible S/N ratio with low microphonics for exacting applications. The EF804S was a Special Quality 10,000+ hour rated low noise pentode for Neumann microphones
The German Telefunken company was the only company that made the EF804S.These items are made and selected by Telefunken for the ultimate performance.
The valve also has a number of improvements over other popular pentodes of the time such as the EF86. Telefunkens EF804S also has a number of design improvements. They used a special cathode coating and changed the pin layout of the cathode and the grid to reduce the cross talk from the filaments. They used a taller more rugged glass envelope and a special anode material which resulted in very low microphonics.
Specially made for the professional recording industry where it was used in microphones and microphone preamps such as the V72.
These come in the Telefunken box and have the Diamond mark.
These valves have been is specially selected under real working condition and have passed the following tests:
Anode current
Transconductance (gm)
Output Drive Tested
Noise 1 (signal to noise)
Noise 2 (Aural)
Microphonics Test 1(Ambient)
Microphonic Test 2 (Shock)
Cathode Test
Grid Leakage Test
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