The Telefunken EF804 tube was made for the professional audio/recording industry where it was used in microphones and mic preamps such as the V72. From TAB-Funkenwerk: "The tube also featured an improved cathode base material (made by the International Nickel Corporation in USA) that used a cathode coating also imported from the US from General Electric. The construction of this cathode made the tube virtually microphonic-proof. While this tube was chiefly designed for use in the AEG/Telefunken Magnetophone, it found its way into much of the professional studio equipment of the time. The first historic V72's to be re-equipped with this state of the art EF804 audio tube were made in the Berlin and Ulm production plants."
Note: All Telefunken made tubes have the diamond logo molded into the glass at the bottom of the tube.
Additional Information and Downloads
What does "NOS" mean, anyway?:
Commonly known as "NOS," the term New Old Stock simply refers to tubes that were made years ago but have never been used. Much like antiques, "NOS" tubes are currently not being manufactured and this means their supply is dwindling while the price continues to rise.
For most NOS tubes we have a variety of brands available. Typically these are the common brands such as RCA, Sylvania, GE, Raytheon, etc. However, there are instances where lesser known brands are in stock. If you have a particular brand you prefer you can simply request it in the Order Comment box when you place your order.
Warranty Information and Return Policy
Warranty Period: 3 months
All our tubes are guaranteed for 3 months from the date of purchase. (Any exceptions will be noted on that tube's Warranty tab)
If you receive a tube that does not perform to the manufacturer's specifications, please do the following:
- contact us to get a return authorization - return it via regular mail within 90 days from when we shipped it, and we will provide an exchange or refund of the full purchase price of the tube.
Returns not related to warranty or defect will be considered at our discretion, and are subject to a 15% restocking fee.
We can not accept returns that don't have an authorization, are past 3 month, or are returned improperly.