Telefunken EF800 Vacuum Tube
The Telefunken EF800 vacuum tube is a special-quality, high-slope RF/IF pentode introduced in 1952 and built on a 9-pin Noval (B9A) base. This tube was developed as a long-life, low-microphonics version of the EF80 (6BX6), with closer manufacturing tolerances and a specialized cathode construction. The EF800 uses a 6.3V heater and is electrically compatible with the EF80, while offering improved resistance to hum and mechanical vibration. Telefunken examples are identifiable by the characteristic diamond molded into the base.
This tube is the replacement tube for Miktek CV4 mics, and other U47 style tube microphones, and Neumann preamplifiers.
Note: Some stock was relabeled/branded by Siemens. However all are Telefunken manufacturered. The diamond molded into the glass is the confirmation.
Other NOS TreasuresAdditional 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 monthsAll 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.
These guidelines may be updated without notice.