Daven WW resistor - Information wanted

[kleiner Rainer]

Greetings,

while rummaging through Dads basement I found a circuit board with 26 precision resistors made by Daven, type 1195. The values range from 127 Ohm to 450kOhm, the tolerances from .375 to .5%. The construction style hints to a wirewound resistor. I found a patent assigned to Daven with construction details that seem to fit the resistors I have:

https://patentimages.storage.googleapis.com/2c/96/ae/d6601c265796e3/US3012216.pdf

Anybody got a data sheet or catalog page with more detailed infos?

Greetings,

Rainer

[jonpaul]

Fine usa made equipment used similar from Dale, Allen's Bradley Daven in 1940s..1970s. Very common, probably metal film not WW.

Just sacrifice one, scraped off outer coating tomsee resistive elements.

We have boxes of them.

Jon

[Kleinstein]

There are notches visible at the top / center and bottom. So this could well be wire wounds.

A first point would likely to just test 1 or 2 to see how stable the resistors are with temperature.  If they don't perform well, one may not have to worry about the details.

[Conrad Hoffman]

Daven made a lot of wire wound resistors. Not sure they made anything else. Do a Google image search on daven and resistor to see a bunch of examples and some old advertising.

[kleiner Rainer]

Google search only found early amplifiers and Nipkow disk TVs made by the Daven Corporation. Searching for a combination with "1195" found something similar:

https://aerobasegroup.com/part-number/1195-10k_00-060-6342

Dimensions: check. Power: check. Part number: check. Resistance: different.

So those Daven 1195 seem to be noninductive wirewound resistors with a +-20ppm temperature coefficient. I measured 150uH at 1kHz with my RCL meter - low enough for a wirewound resistor. If I am bored, I will try to measure tempco.

Greetings,

Rainer

[Conrad Hoffman]

https://www.google.com/search?q=daven+resistor&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjBmMKWt8H2AhX2kIkEHWR0AmoQ_AUoAnoECAEQBA&biw=1920&bih=937&dpr=1

See what this shows under images.

[TimFox]

Around 1965, Daven was known mostly for their audio attenuators (suitable for broadcast and mixing boards) and high-quality rotary switches.
Back in 1960, when the corporate fashion was to buy totally unrelated companies to show diversity of business, they were bought by General Mills, to complement their Cheerios.
In 1976, they were acquired by Shallco (who had previously acquired Shallcross switches and attenuators) and merged thereinto.