Yes, as Allan Cohen pointed out, the 9TO keyer is in the 16th edition (1962) of the Radio Handbook, edited by W6SAI. The version presented seems to be identical to the one in the Madison Electronics schematic on Kees HBR CD. Bill Orr refers to this circuit in the handbook as "famous" so I assume that means it was in circulation well before 1962.
The keyer I have would seem to support that idea. It uses older components. The 1962 design has miniature VR tubes while the one I have has octal VR tubes. The 1962 design uses silicon diodes as rectifiers while the one I have uses selenium rectifiers. Otherwise, the circuits seem to be identical. I am anxious to hear this thing go. 73, Don Merz, N3RHT -----Original Message----- From: Steve Rodowicz [mailto:[EMAIL PROTECTED] Sent: Friday, August 13, 2004 8:21 AM To: Merz Donald S; 'Amradio (E-mail); 'Glowbugs (E-mail) Cc: [EMAIL PROTECTED] Subject: Re: GB> Original T.O. Keyer Article When? Importance: High Don, Plans for the TO Keyer were included in the "West Coast Handbook" about 1963+/-. Had a HS friend who built one & it worked well. Not sure if & when it ever appeared in a "major" ham publication, althought it does sound like a CQ magazine type of article. Can research & possibly scan if necessary. 73, Steve - N1SR At 10:16 AM 8/12/2004, Merz Donald S wrote: >I have a piece of homebrew here that says in Dymo labeling that it is a >"TO Keyer". I'd like to look this up. Does anyone happen to know the >ballpark year when the original TO Keyer article was published? In QST I >assume? > >73, Don Merz, N3RHT > >The information contained in this e-mail may be confidential and is >intended solely for the use of the named addressee. >Access, copying or re-use of the e-mail or any information contained >therein by any other person is not authorized. >If you are not the intended recipient please notify us immediately by >returning the e-mail to the originator.(B) The information contained in this e-mail may be confidential and is intended solely for the use of the named addressee. Access, copying or re-use of the e-mail or any information contained therein by any other person is not authorized. If you are not the intended recipient please notify us immediately by returning the e-mail to the originator.(B)
