This ebay listing of a Yaqin MC5881A amp has the 5881 (6L6) power tubes and 12AX7 / 12AU7 preamp tubes and the other tubes look to me like rectifying tubes, but are listed as 6N6? I looked up 6N6 tubes and they look nothing like those. Can someone tell me what they are?
This ebay listing of a Yaqin MC5881A amp has the 5881 (6L6) power tubes and 12AX7 / 12AU7 preamp tubes and the other tubes look to me like rectifying tubes, but are listed as 6N6? I looked up 6N6 tubes and they look nothing like those. Can someone tell me what they are?
Looks to me like 5881/6l6's, 12AX7, 12AU7, and the other two are display tubes? (showing output?)
Have you ever seen the "Magic Eye" indicator? I saw a couple used to indicate signal strength for FM tuners, or record level on reel to reel tape decks.
There is a strip of phosphor or something inside the tube. It gives off an eerie greenish glow. The length of the glowing part of the strip can vary depending on some value - perhaps bias, or input level, or something.
Have a look at the first photo on this page:
http://hhscott.com/cc/magic_eyes.htm
There is a strip of phosphor or something inside the tube. It gives off an eerie greenish glow. The length of the glowing part of the strip can vary depending on some value - perhaps bias, or input level, or something.
Have a look at the first photo on this page:
http://hhscott.com/cc/magic_eyes.htm
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