Tube Amps / Music Electronics
For current discussions, please visit Music Electronics Forum. New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!

Listen to great tunes streaming live right now!

ampage archive

Vintage threads from the first ten years

Search for:  Mode:  

EF86 variant

11/27/2005 4:11 AM
Evan EF86 variant
Is there a tube contains a EF86 and a low MU (like a 12AU7)triode, for a CF, in the same tube? For V1 in a preamp. It seems to me that there is but can't recall...Thanks
11/27/2005 10:31 AM

The 7199 tube comes to mind, it is a sharp cutoff pentode and medium mu triode in one envelope. It was designed for low noise and use in hifi circuits. IIRC, RCA was the only manufacturer so they are rare and relatively expensive.  
The 6GH8, 6U8, and 6BL8 are all similar to the 7199 in performance, but have a different pinout than the 7199. The 6GH8, 6U8, and 6BL8 were all used in TVs in the 60s, so tens or maybe even hundreds of thousands were produced. They never were really used in audio amplifiers much, so they are relatively inexpensive.  
Book Of The Day The Ultimate Tone, Volume III by Kevin O'Connor
Have you ever wondered if there is a better way to build a Bassman, Champ, Plexi, an 800, AC-30, Bulldog or Portaflex? Or you wanted to build an SVT with off-the-shelf parts? How about a master-volume amp that doesn’t change tone with the master setting? Everything you need to know is right here, including: proper grounding techniques, wiring methods, and mechanical considerations. Eighteen chapters cover the “iconic” amps everyone knows and loves, with schematics and layouts for each, along with the technical history of the product. Eyelet-board and chassis-mounted tube socket construction is used throughout, for easy servicing and modding. TUT3 is very accessible even if you cannot fully read a schematic and is a "must have" if you are going to build an amp for your self.

Note: The Ampage Archive is an Amazon Associate site. A small commission is paid to the site owner on any qualified purchase made after clicking an associate link such as the one above.
11/27/2005 7:00 PM
John Martin
The 6AN8 is another. I have seen all the above mentioned tubes in audio gear at some point. The 6U8 was in a lot of Stromberg gear, as an example.  
   Page 1 of 1