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 Post subject: What is it?
PostPosted: Jan Mon 31, 2011 8:42 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 119
Location: Viterbo, Italy
Hi all,
This is a Fivre tube made in Italy under RCA license as stated at the bottom of the base, it has an UX4 base and is approximately 4"1/4 tall; the only marking i can see is an "R" etched on the base. Can anybody recognize a RCA tube like this?
Can't understand how upload photos to the gallery so it's in my Facebook album.
http://www.facebook.com/photo.php?fbid= ... 4177010415
Ciao.
Max


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 Post subject:
PostPosted: Jan Mon 31, 2011 8:57 pm 
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Location: S. Dartmouth MA 02748-1225 USA
It is a gaseous rectifier similar to the Raytheon BH. Should be hydrogen filled at a certain pressure . Does not have a filament, one pin is not used. Will fail if overloaded, however, most failure is from leakage of hydrogen changing the pressure. Used in some early transition AC radios and in "B" supplies, 1924 late.

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 Post subject:
PostPosted: Jan Mon 31, 2011 9:56 pm 
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Location: Livermore, CA
Max

That's a BH regradless. RCA may have made the base but sure looks like Raytheon made the tube.

http://www.wps.com/archives/tube-datash ... 40M/14.JPG

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 Post subject:
PostPosted: Jan Mon 31, 2011 11:15 pm 
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Location: Pocasset, Cape Cod, MA
I think you meant helium. Some competitive gaseous rectifiers used argon.

R probably stands for Raytheon. I believe Raytheon did license foreign companies to make or sell BHs.


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 Post subject:
PostPosted: Feb Tue 01, 2011 2:07 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 119
Location: Viterbo, Italy
Hi all,
Chas, Norm, Alan thanks for the replys, The base is made in Italy too and reports "stampato da ICS" "Fivre licenza RCA" "printed by ICS" (ICS was an Italian socket maker) and "Fivre under RCA license"; During the 30's Fivre made an almost complete American tube series and almost every tube was marked with "RCA license", some odd tubes were a 6E5GT and a radio G series with strange long straight bulbs. Has RCA ever made BH's? Can it be tested on my TV7D/U?

Ciao.
Max


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 Post subject:
PostPosted: Feb Tue 01, 2011 3:19 pm 
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Location: Livermore, CA
Max

BH has plate and cathode reversed from 80 type rectifiers. The plates are on pin #1 and #4. Cathode is pin #2.

Raytheon made BH and had the patents. RCA didn't make a BH.

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 Post subject:
PostPosted: Feb Tue 01, 2011 6:57 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 119
Location: Viterbo, Italy
Hi all,
Thanks Norm, so it must be another strange thing from Fivre. :roll:
Here is a picture of the odd tubes; 6A8G, 6K7G, 6Q7G compared with a 6V6GT and the 6E5GT.
http://www.facebook.com/home.php?sk=236 ... 4177010415
Ciao.
Max


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 Post subject:
PostPosted: Feb Tue 01, 2011 7:57 pm 
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Location: Livermore, CA
Most of those tubes were popular here, except 6E5GT. Sure is a big difference in appearance between Fiver & US made tubes. Nice color bases.

I recently received a CD of the Fivre factory, around 1930.

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 Post subject:
PostPosted: Feb Wed 02, 2011 7:37 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 119
Location: Viterbo, Italy
Hi all,
Norm, I wrote about these "G" tubes because they are odds, in different times Fivre made normal "G" tubes with souldered shape exactly like US makers. I have another couple of odds to show you: an RCA '80 with a gt bulb made in Italy by ATES and a never seen RCA (by ATES) EM34. I'd like to have a copy of that CD, where you found it?

http://www.facebook.com/photo.php?fbid= ... 4177010415
http://www.facebook.com/photo.php?fbid= ... 4177010415

Ciao.
Max


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 Post subject:
PostPosted: Feb Wed 02, 2011 8:33 pm 
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Location: Livermore, CA
Max

Newer 80 tubes were made with straight sides, like the one you show.

I received the CD from a radio collector in Italy. Send me your address and I'll make a copy? Do you have Antique Radio Magazine from Italy? I have most copies on CD.

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 Post subject:
PostPosted: Feb Thu 03, 2011 8:17 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 119
Location: Viterbo, Italy
Hi all,

Norm, thanks for your kindness, if it's from ARM I'll find it!

Ciao.
Max


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