Glowing mercury thyratrons: inside a 1940s Teletype switching power supply righto.com



This punch unit has to be something different that I am used to playing with..

Skip

Skip MacAulay
VE6BGT

On Sat, Aug 12, 2023, 10:58 PM [email protected], <[email protected]> wrote:

An original  power supply for the 19 was to supply the current for punch magnet. 

 I'm thinking the original bell system PS I had was rated at 900 mA. There must have been 

3 or 4 different designs over the years.  There was the one with the nice blue glow tubes,

The simple transformer with a selenium rectifier stack and L C filtering.  Then there were 

The ones that regulated with some weird combination L and C that was called something like 

Ferromagnetic resonance regulation.  (Sola made a line of these just to do a range of 

100-150? AC Input, 117 AC regulated output)

Navy Radio has a document or 2 with schematics of the various types. 

---

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You said "tomorrow" yesterday.

The above comments or recommendations are SWAG. Use at your own risk.

John, W9DDD

On Aug 12, 2023, at 11:23 PM, Skip Macaulay <[email protected]> wrote:

Why a switching supply and also why a high current rating of 830 milliamps?? Isnt this just for the magnet loop supply? Unless I dont get what your doing the loop supply for my model 19 was only 60 milliamps..   Skip

On Sat, Aug 12, 2023, 9:13 PM Windows XD, <[email protected]> wrote:

Also I'm fine with, almost prefer if it were tube operated, although I'm not sure if that would push it beyond my skill level.

On Sat, Aug 12, 2023 at 11:10 PM Windows XD <[email protected]> wrote:

Dear Greenkeys community,

I'm trying to build my own power supply for my Teletype model 19, it needs 120-130VDC of power @ 830Ma. I'm working on a circuit for it, but I don't exactly know what I am doing because I've never done this before. Would you let me know if I am on the right track to building a switching power supply? 

P.S. I know it needs a snubber circuit somewhere and none of the actual switching circuitry is there, I don't know enough to know what goes where.

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Skip MacAulay
VE6BGT

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Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch

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1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html

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