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Base 7S or 7AC
Ron Ramirez
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Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand State, Province, Country: Indiana
#2

11-03-2017, 08:00 PM
Agree, 7S and 7AC look the same to me as well.

Only, tube type 8417 is listed as having an 8LY base on my favorite online tube database, NJ7P.org?

Edit: Duncan Amps shows 8417 as having the same pinout as 6L6. I'm not familiar with the 8LY designation.

Edit #2: RCA tube manual RC-30 shows the 8LY designation as having pins 1 and 3 tied together (plate). Otherwise the same.
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Ron Ramirez
Ferdinand IN
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Messages In This Thread
Base 7S or 7AC - by Phlogiston - 11-03-2017, 04:30 PM
RE: Base 7S or &AC - by Ron Ramirez - 11-03-2017, 08:00 PM
RE: Base 7S or &AC - by Phlogiston - 11-03-2017, 09:57 PM



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  1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Vintage Hi-Fi, Stereo and Audio