Burroughs nixie boost converters...

[Nick]

Acquired a couple of different ones of these in NOS condition. Very different in style and with very boring names:

VC12-170 which stands for "Voltage Converter, 12VDC to 170VDC" and VC28-170 which is uses 28VDC as input rather than 12VDC.

I could sketch the schematic of these, but it'd be a bunch easier if someone had some info on these already!

Nick

[jb-electronics]

I have one VC12-170 as well - in fact, I inquired about these here in this group some weeks ago as well, but I got no responses. I did not even know that Burroughs made these until then.

Jens

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[Nick]

They are listed in Burrough's Sept 1st, 1963 R55 price schedule - copy on Frank's pages at http://frank.pocnet.net/other/Burroughs/ReadoutsPrices.pdf

They are called "TRAMAG DC/DC CONVERTERS" and cost USD 48.50 each - a lot of money. The price schedule is in itself a useful and interesting document... Nixies were never cheap...

[Bill van Dijk]

There were a few manufacturers making these kind of modules. I have a few made by TECTROL (Toronto Canada) model SP108A, DC-DC converter, 6V in, 180V 70mA out. It measures 2” x 2” x 1 ¼”. They are potted, so I can’t see inside.

 

They were a great find in the scrap yard of a petroleum service provider. They had recently upgraded an old gas station who was still running VFD equipped pumps. I was allowed to salvage all the circuit boards. Great find, except for the one unit that was claimed by wasps before it was turned over to me! J I now also have a number of 1” high VFD digits as well as some smaller 2 digit units (Babcock SP-101 and Babcock SP-352). I also found out they just destroyed a whole bunch of pumps with numitron displays….. L

 

Bill van Dijk

 

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[Jon]

Some of Burroughs' power supply designs could be uh, exciting. I have an unbuilt Burroughs power supply which formed part of a Self-Scan Bargraph Designer's Kit. The 250V rail is derived by directly rectifying mains in, and feeding it through a standard zener/pass transistor set up. Clearly the intended audience for the kit never stuck their fingers where they shouldn't nor suffered unfortunate component failures... Nicko may want to insulate his fingers before poking around in that PSU !

 

The board also provides an auxiliary 5V supply, and you'll be pleased to hear that they did feel that a transformer was warranted for that application.

 

Jon.

[Bill van Dijk]

Brainfart alert:

 

These Babcock units are NOT VFD as I stated in my earlier message, they are Panaplex (Plasma dot) units, a close cousin to the NIXIE.

 

Bill van Dijk