Successful TPU-ECD replication !

[otto]

Hello all,

Im on vacation and fixing my equipment.

My HAMEG HM oscilloskop is fixed. Finally.

Now I have a new problem:

Maybe someone of you have a shematic of a TECTRONIX 2445B scope??? I have to fix this scope too.

Thanks.

Otto

[Gustav22]

Hello Roberto and Otto

as far as I understand you have discovered two possibilities to connect a load to the ECD. These two possibilities are as follows:

1) Load attached between points Phase and Zero on the collector(s).

2) Load attached to an additional (i.e. third) winding of the CCs.

Obviously when the load is connected as in possibility 2), the two collector leads are completely isolated from each other.
Yet it is the main characteristic of a M?bius topographic arrangement, that every point in the arrangement is connected to every other point so that there is no beginning and no end.
If I look at the ECD-collector with this in mind, there is no Mobius topography, when the two collector leads are isolated from each other.

So if you have any time and when all your equipment is working

maybe it would be good to try to connect the load as in 2) and at the same time put a diode between Phase and Zero to provide an uninterrupted M?bius topography of the two collector leads.

[Motorcoach1]

Otto -Ã,  thats great news !Ã,  Ã,  I'll post my latest coil here,Ã,  Ronnet has seen it so i feel you need a look see.Ã,  I'll start winding it soon. the coax is inside the aluminum tube top and bottom. any asistance would be welcome .

[gyulasun]

Hello all,

Im on vacation and fixing my equipment.

My HAMEG HM oscilloskop is fixed. Finally.

Now I have a new problem:

Maybe someone of you have a shematic of a TECTRONIX 2445B scope??? I have to fix this scope too.

Thanks.

Otto

Hello Otto,

Here is a link for some free downloadable Tektronix oscilloscope service manuals but unfortunately your 2445B is not included.  But they have 2465B which may has the same input stages.  They also have 2445 but it may has a bit different input circuits, your 2445B type was issued 3-4 years later, a friend of mine told me.

So this is the link: http://bama.edebris.com/manuals/tek/ 

Also, there is a Yahoo mail group on repairing older/classic Tektronix scopes, they may be able to help you,  they may have collection in their Files section, and they probably can help with good pieces of advice, see this link and log in:

http://tech.groups.yahoo.com/group/TekScopes/

Regards
Gyula

[ronotte]

Hello Otto,

thanks to Earl, here you can find the 2445 manual (for $14):
--------------------------------------
http://business.search.ebay.com/oscilloscope_Manuals-Books_W0QQsacatZ40119

http://cgi.ebay.com/Tektronix-Tek-2445-Oscilloscope-Service-Manual_W0QQitemZ330148006856QQihZ014QQcategoryZ40123QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
================
ask
David DiGiacomo
david@slack.com
========

Roberto