"Ralph Cameron" ha scritto nel messaggio
...
Steve:
Most Tek scopes used an orange filter to view the trace. I may have one
from an old Dumont scope if you want to email me offline.

Ralph ve3bbm at RAC.ca
replace the "at" with the appropriate

"Steven Swift" wrote in message
...
According to my DuMont handbook of CRTs, a yellow filter can be
used with a P7 phosphor CRT to allow viewing of the long decay
part without being "blinded" by the bright blue trace. I've searched
Ebay, Sphere Research and other sites looking for these.

Anyone have one good for a 3" round CRT or know of a good substitute
material (perhaps from a hobby store)?

TIA,

Steve.
--
Steven D. Swift, , http://www.novatech-instr.com
NOVATECH INSTRUMENTS, INC. P.O. Box 55997
206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA


Steven, any photographic deep yellow filter will do.
May be you can find a Kodak, Ilford, or Agfa or similar brand yellow
acetate or gelatin filter.
If you cannot find a deep one, use two filters.
Ciao, Piero