Sylvania made some combination console TV's in the late 60's that had electronic 35mm slide viewers. These used, I believe, a small aperture B/W flying spot scanner that back illuminated the slide into a set of transmission beamsplitters to three separate color pickup tubes. Your old tube may be a custom built component of that system. From the way it is described, it may be one of the pickup tubes. The plate in the tube you describe may be a photon sensitive grid control plate. A photon detector. It could also be a beam detector used in a doorway sentry. Dominic DiLeo Atlantic TV Freeport, Maine ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In a message dated 4/30/04 6:48:27 AM Eastern Daylight Time, paulcho@xxxxxxxx writes: << I have a old B&K model 1077 analyst that uses the tube that you= are describing it is the photo tube part # 231- 001-9-001 And it= does have 11 pins. Tv-Service-Company RR 3 Box 3550 Hazleton,Pa.18202 On Thu, 29 Apr 2004 18:42:46 -0500, VM wrote: >I can't find any tubes with 11 pins in my antique tube manual,= only >7, 8, >9,10 & 12 pins. (Some have a Plate Cap on top, of course) Could= you >have >miscounted the pins? > >Vernon Mosley <vlm@xxxxxxxxxxxxxxxxxx >Mosley TV Service >Success, MO 65570 >----- Original Message ----- >From: <Royal19960@xxxxxxx> >To: <techassist@xxxxxxxxxxxxx> >Sent: Wednesday, April 28, 2004 1:41 PM >Subject: [TechAssist] Any info on this old tube/ additional= info > > >>Hi all, Thanks for all the responces and here is all the info I= can >supply. >>Tube number is in a Sylvania box with a number os 13-27681-4 >>Size is like a 6sn7 >>Bakelite base with a key >>Has 11 pins >>made in 1968 >>The words "red"" blue" are stamped on the base >>There is a visable grid on one side of the tube. >>Thats all I can offer in info. Thanks in advance >>Roy >>Roy Adams >>Bonded TV Service >>5158 W Forest Home Ave >>Milwaukee, WI 53219 >>414-541-9111 >>www.Bondedtv.com >>we have thousands of tubes on the site >>Webhosting from only 4.95 a month at Bondedhost.com >> >> ----------------------------------------------------------------------------- Lost Password: http://www.tech-assist.org and select "Login Problems?". Email Archives: http://www.freelists.org/archives/techassist/