Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
Search
21A and 22A for 555
|
Stan or Patricia Griffiths
morriso2002@... wrote:
Timebase plugins however are not so easy to find - in fact if anyoneHi Morris, There was an extensive modification to the 21A and 22A tunnel diode triggers at SN 11000. 21A and 22A timebases have the older tunnel diode trigger circuitry in them from SN 7000 to SN 10999. I would stay away from those unless they have had Mod Kit 040-0417-00 installed. The kit is very complex and includes a double sided circuit board and lots of hard to find parts so it would be almost impossible to try to put this kit together from scratch. The early TD triggers were very unstable and I can remember being very frustrated trying to get them adjusted so they would continue to operate reliably. They way to tell if the mod has been installed or not is too look in the timebase in question on the top of the chassis and just behind the front panel about an inch to see of the etched circuit board is installed there. The early 21A and 22A timebases had a couple of short rows of the small notch ceramic strips installed there with the early TD trigger circuits installed on them. Stan w7ni@... |
|
--- In TekScopes@y..., Stan or Patricia Griffiths <w7ni@e...> wrote:
morriso2002@y... wrote: There was an extensive modification to the 21A and 22A tunnel diodetriggers <snip> I would stay away fromthose unless they have had Mod Kit 040-0417-00 installed.Hi Stan, Thanks for the advice. The only 21A/22A I have ever seen, which belongs to a friend, has the later version triggers. These timebase plugins are not easy to find and I suspect "beggars will have to be choosers" if a pair ever turns up. Mind you, the 21/22 works very nicely indeed. Incidentally do you know if it is possible to mix a 21 and 22A or 21A and 22 in the one mainframe? Morris |
|
Stan or Patricia Griffiths
Mixing 21,22,21A, 22A. Let me say I don't know of any reason why you
toggle quoted message
Show quoted text
couldn't do it but I have never tried it . . . I will keep my eyes open for some plugins for you. I just enlarged my collection by an addtional 350 instruments (to a total of about 1100) so I might just have some by the time I get all that stuff transported to my shop . . . Stan w7ni@... morriso2002@... wrote: --- In TekScopes@y..., Stan or Patricia Griffiths <w7ni@e...> wrote:morriso2002@y... wrote:There was an extensive modification to the 21A and 22A tunnel diodetriggers |
|
--- In TekScopes@y..., Stan or Patricia Griffiths <w7ni@e...> wrote:
I will keep my eyes open for some plugins for you. I just enlargedmy collection by an addtional 350 instruments (to a total of about1100) so I might just have some by the time I get all that stuff transported tomy shop Amazing!! Thanks you very much, I would be very grateful if you could find me a 21A/22A set. Morris |
|
Stan or Patricia Griffiths
Its going to be a couple of months before I get all the stuff here. I am
toggle quoted message
Show quoted text
depending on you to remind me of this need you have for the 21A and 22A. Did you say the early version would be OK or do you want only the later ones? Stan w7ni@... morriso2002@... wrote: --- In TekScopes@y..., Stan or Patricia Griffiths <w7ni@e...> wrote:I will keep my eyes open for some plugins for you. I just enlargedmycollection by an addtional 350 instruments (to a total of about1100) so Imight just have some by the time I get all that stuff transported tomy shop |
to navigate to use esc to dismiss