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Old 18th January 2016, 04:29 PM   #21
kevinkr is offline kevinkr  United States
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The zero bias valve
The maker of these tubes seems somewhat obscure despite living geographically nearby. I've never even seen one of these tubes and I suspect even back in their heyday they were pretty rare. The maker is listed as an RCA licensee based in Pawtucket RI.

Interesting idea which apparently never really caught on, wondering if cost was excessive or reliability was a problem. It could even be that in the context of depression America there was not a significant market for such a device.
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Old 10th July 2018, 11:39 PM   #22
PRR is offline PRR  United States
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Sorry for the necro.

But the Triad tube building is still there. I-95 (destroyer of many mills) just missed it.

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Originally Posted by kevinkr View Post
The maker of these tubes seems somewhat obscure despite living geographically nearby. I've never even seen one of these tubes and I suspect even back in their heyday they were pretty rare. The maker ... in Pawtucket RI....
It's a mill building. These were built in "bays" of 8'-16' to suit interior framing lumber. In the 2018 pic the back 5-bay building is probably original from mid-1800s. The front 4-bay addition is probably late 1800s. The front two bays, now blank, held the giant tube logo. The rear building in the 1930 etching may be a early 1900s addition now fallen; or may be an artist's conception of how Triad Tubes would grow and expand.

Mills like this are all over the CT-RI-MA piedmont. Big industry for a century. Improved railroads opened-up western competition; by 1929 many had For Sale signs. This one got a taker, many didn't. Leaky roofs doomed many mill buildings. YOU Bostonites know all this; for lurkers.

It's still sturdy enough for yoga.

Get a clipboard and flashlight. Say you are from city hall and have to "inspect the tubes". Look in the the attic, sump, and boiler room, see what got left behind.
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File Type: jpg TriadTubes-2018.jpg (255.2 KB, 121 views)
File Type: jpg TriadTubes-2018-map.jpg (56.4 KB, 129 views)

Last edited by PRR; 10th July 2018 at 11:41 PM.
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Old 11th July 2018, 02:47 AM   #23
smoking-amp is offline smoking-amp  United States
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I've seen a few Triad tubeboxes and tubes in the $1 tube lots I've ordered from ESRC and Vacuumtubes.net. Triad seems to have had some presence in Miami too.

The boxes say the tubes come with a lifetime guarantee! I haven't tried to get any replacements though....
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File Type: jpg Triad_tube_.jpg (32.7 KB, 99 views)
File Type: jpg Triad_tube__.jpg (27.9 KB, 21 views)

Last edited by smoking-amp; 11th July 2018 at 02:57 AM.
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Old 11th July 2018, 03:16 AM   #24
PRR is offline PRR  United States
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> presence in Miami too

Rhode Island Radio

In June of 1965 we find an article in The Miami News of The Triad Tube Corporations moving ....Sunshine State Industrial Park in North Dade. ...electronics wholesaler distributing vacuum tubes .... through discount chain stores ....the firms goal to get "at least one per cent of the.... market."
Rhode Island Radio - INDEX

Sometime between 1935-1935 and 1965, the operation (now probably just a warehouse and re-brander) moved from the North to the South.
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Old 11th July 2018, 03:23 AM   #25
smoking-amp is offline smoking-amp  United States
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I would guess that Triad transformers had some connection too. Have seen many Triad power, audio output and TV flyback transformers.
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Old 12th July 2018, 03:21 AM   #26
PRR is offline PRR  United States
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Originally Posted by smoking-amp View Post
I would guess that Triad transformers had some connection...
No. Triad Transformers was in/near Los Angeles or Venice from the 1940s until Litton bought the shop in 1957 and Indiana started appearing on the letterhead. More recently they are in California again. (Maybe the iron/factory never left, just different main offices.) As you say, TV made Triad Magnetics BIG.

Triad Historical Archive
Triad Historical Archive
Triad Transformer Catalog 1952

OTOH Triad Tubes appears to have never sold anything but tubes, from RI then Fla, and only in a now-small way. (Their first years they seem to have been "large" for an independent, but the rise of Cunningham Ken-Rad and Harrison doomed all small independents.)

So more like Acme Supermarkets, Acme industrial transformers, and Acme road-runner traps. Just a cool name.
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Old 12th July 2018, 04:56 AM   #27
popilin is offline popilin  Argentina
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So more like Acme Supermarkets, Acme industrial transformers, and Acme road-runner traps. Just a cool name.
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