UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - 7ABP-33A tube

grindrod · 13th Mar 2006, 12:00 pm

I used a 7BP7 long persistance tube for SSTV years ago for both receiving and as a flying spot scanner. The blue emission is at least an order of magnitude brighter than the yellow afterglow so in practice it works fine as a flying spot scanner.

The afterglow is only really visible in a darkened room and generally didn't last long enough to view a complete SSTV frame so I used a Polaroid 'scope camera to capture images!

Hope this helps!

Martin

13th Mar 2006, 12:00 pm	#5
grindrod Retired Dormant Member Join Date: Feb 2005 Location: Stroud, Gloucestershire, UK. Posts: 57	Re: 7abp33a Tube I used a 7BP7 long persistance tube for SSTV years ago for both receiving and as a flying spot scanner. The blue emission is at least an order of magnitude brighter than the yellow afterglow so in practice it works fine as a flying spot scanner. The afterglow is only really visible in a darkened room and generally didn't last long enough to view a complete SSTV frame so I used a Polaroid 'scope camera to capture images! Hope this helps! Martin