Author Topic: German Siemens V Sa tist 66 C b close to W28  (Read 188 times)

Offline dsk

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German Siemens V Sa tist 66 C b close to W28
« on: March 09, 2021, 07:55:27 AM »
I got this phone from 1929, 2. year of production.

All other phones I have seen from Germany had a resistor and the capacitor across the pulse contacts. This one has none.

dsk
PS added 2 related diagrams. DS
« Last Edit: March 09, 2021, 12:02:23 PM by dsk »

Offline RB

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Re: German Siemens V Sa tist 66 C b close to W28
« Reply #1 on: March 09, 2021, 10:26:49 AM »
Nice.
Was the RC pair a pop filter?

Offline dsk

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Re: German Siemens V Sa tist 66 C b close to W28
« Reply #2 on: March 09, 2021, 10:40:25 AM »
Nice.
Was the RC pair a pop filter?
  My English is obviously not good enough, could you please explain what you are asking about. 
dsk

Offline RB

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Re: German Siemens V Sa tist 66 C b close to W28
« Reply #3 on: March 09, 2021, 01:07:26 PM »
Sorry, DSK, pop filter is what takes the click, or loud POP sound out of the receiver when dialing, and going on/off hook.
Now that I typed it out, I don't think it is a pop filter.
What do you say the resistor/cap are there for?
I should have asked it that way to begin with...

Offline dsk

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Re: German Siemens V Sa tist 66 C b close to W28
« Reply #4 on: March 09, 2021, 01:29:24 PM »
 ;D Now I wonder why I didn't understand that  :D
The resistor and capacitor was put across the the dials pulse contacts to reduce the risk of sparks.
Probably not a great problem, it still works OK after 92 years  ;D

dsk

Offline RB

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Re: German Siemens V Sa tist 66 C b close to W28
« Reply #5 on: March 09, 2021, 02:21:44 PM »
OK, thanks for clearing that up! :)

Offline dsk

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Re: German Siemens V Sa tist 66 C b close to W28
« Reply #6 on: March 16, 2021, 01:28:00 PM »
Looks like this version also may be named SA 28