Oddball Raytheon Subminiature Tubes QF-721
Hello, My apologies for the intrusion. but I have a question that I
am hoping someone has an answer to. I have never posted to a news group, so again, my apologies if this does not meet the standard protocol. I have a bunch of Raytheon Subminiature tubes that I inherited from my Father, who was an electronics bugg (I followed a different path) that have code QF-721. In searching the internet I have found a bunch of identical looking tubes such as one labeled CK6088. I have done lots of searches on the internet and I cannot find out anything about these and am wondering if you know about these, or if you can point me to a website that might shed some light on these. I am considering the possibility of donating these to someone but if I cannot find out what they are for, I cannot imagine how I can find who to donate them to -- perhaps a school or something. |
Oddball Raytheon Subminiature Tubes QF-721
Robert Seely wrote:
I have a bunch of Raytheon Subminiature tubes that I inherited from my Father, who was an electronics bugg (I followed a different path) that have code QF-721. In searching the internet I have found a bunch of identical looking tubes such as one labeled CK6088. I have done lots of searches on the internet and I cannot find out anything about these and am wondering if you know about these, or if you can point me to a website that might shed some light on these. That's a Raytheon experimental number. I have a Raytheon document dated 1953 which lists a bunch of the QF numbers but not that one. These were never intended to be sold to the general public and so were not listed in the handbooks. These are apt to be a variant of some relatively standard submini tube but without the original documentation or without a sample tube to put on the curve tracer I am not sure how we'd know precisely what it is a variant of. Almost certainly your father bought a bunch of these from a surplus dealer. In the fifties and sixties there was a lot of wacky stuff coming loose from manufacturers like this. I am considering the possibility of donating these to someone but if I cannot find out what they are for, I cannot imagine how I can find who to donate them to -- perhaps a school or something. If you send me one I'll put it on the curve tracer and tell you more or less what it is. Submini tubes in general are not worth very much because the Raytheon plant was still making them well into the late 1980s and they're still coming out of the surplus pipeline even today. But they are still very, very cool and a lot of fun for small radio and audio projects. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
Oddball Raytheon Subminiature Tubes QF-721
On Aug 12, 11:57*pm, Robert Seely wrote:
On Aug 12, 7:25*pm, (Scott Dorsey) wrote: Robert Seely wrote: I have a bunch of Raytheon Subminiature tubes that I inherited from my Father, who was an electronics bugg (I followed a different path) that have code QF-721. *In searching the internet I have found a bunch of identical looking tubes such as one labeled CK6088. I have done lots of searches on the internet and I cannot find out anything about these and am wondering if you know about these, or if you can point me to a website that might shed some light on these. That's a Raytheon experimental number. *I have a Raytheon document dated 1953 which lists a bunch of the QF numbers but not that one. These were never intended to be sold to the general public and so were not listed in the handbooks. These are apt to be a variant of some relatively standard submini tube but without the original documentation or without a sample tube to put on the curve tracer I am not sure how we'd know precisely what it is a variant of. Almost certainly your father bought a bunch of these from a surplus dealer. *In the fifties and sixties there was a lot of wacky stuff coming loose from manufacturers like this. I am considering the possibility of donating these to someone but if I cannot find out what they are for, I cannot imagine how I can find who to donate them to -- perhaps a school or something. If you send me one I'll put it on the curve tracer and tell you more or less what it is. *Submini tubes in general are not worth very much because the Raytheon plant was still making them well into the late 1980s and they're still coming out of the surplus pipeline even today. *But they are still very, very cool and a lot of fun for small radio and audio projects. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." email me your address and I'll send you one. - Hide quoted text - - Show quoted text - r s s 9 2 0 8 4 at g m a i l dot com |
Oddball Raytheon Subminiature Tubes QF-721
"Scott Dorsey" wrote in message ... Robert Seely wrote: I have a bunch of Raytheon Subminiature tubes that I inherited from my Father, who was an electronics bugg (I followed a different path) that have code QF-721. In searching the internet I have found a bunch of identical looking tubes such as one labeled CK6088. I have done lots of searches on the internet and I cannot find out anything about these and am wondering if you know about these, or if you can point me to a website that might shed some light on these. That's a Raytheon experimental number. I have a Raytheon document dated 1953 which lists a bunch of the QF numbers but not that one. These were never intended to be sold to the general public and so were not listed in the handbooks. These are apt to be a variant of some relatively standard submini tube but without the original documentation or without a sample tube to put on the curve tracer I am not sure how we'd know precisely what it is a variant of. Almost certainly your father bought a bunch of these from a surplus dealer. In the fifties and sixties there was a lot of wacky stuff coming loose from manufacturers like this. I am considering the possibility of donating these to someone but if I cannot find out what they are for, I cannot imagine how I can find who to donate them to -- perhaps a school or something. If you send me one I'll put it on the curve tracer and tell you more or less what it is. Submini tubes in general are not worth very much because the Raytheon plant was still making them well into the late 1980s and they're still coming out of the surplus pipeline even today. But they are still very, very cool and a lot of fun for small radio and audio projects. --scott Among other applications sub-miniatures were used in hearing aids and model aircraft controllers. -- -- Richard Knoppow Los Angeles WB6KBL |
Oddball Raytheon Subminiature Tubes QF-721
On 08/13/2011 01:48 PM, Richard Knoppow wrote:
"Scott wrote in message ... Robert wrote: I have a bunch of Raytheon Subminiature tubes that I inherited from my Father, who was an electronics bugg (I followed a different path) that have code QF-721. In searching the internet I have found a bunch of identical looking tubes such as one labeled CK6088. I have done lots of searches on the internet and I cannot find out anything about these and am wondering if you know about these, or if you can point me to a website that might shed some light on these. That's a Raytheon experimental number. I have a Raytheon document dated 1953 which lists a bunch of the QF numbers but not that one. These were never intended to be sold to the general public and so were not listed in the handbooks. These are apt to be a variant of some relatively standard submini tube but without the original documentation or without a sample tube to put on the curve tracer I am not sure how we'd know precisely what it is a variant of. Almost certainly your father bought a bunch of these from a surplus dealer. In the fifties and sixties there was a lot of wacky stuff coming loose from manufacturers like this. I am considering the possibility of donating these to someone but if I cannot find out what they are for, I cannot imagine how I can find who to donate them to -- perhaps a school or something. If you send me one I'll put it on the curve tracer and tell you more or less what it is. Submini tubes in general are not worth very much because the Raytheon plant was still making them well into the late 1980s and they're still coming out of the surplus pipeline even today. But they are still very, very cool and a lot of fun for small radio and audio projects. --scott Among other applications sub-miniatures were used in hearing aids and model aircraft controllers. Subminiature tubes were developed as bomb fuses for use in mines and torpedoes. |
Oddball Raytheon Subminiature Tubes QF-721
Kenneth Scharf wrote:
On 08/13/2011 01:48 PM, Richard Knoppow wrote: Among other applications sub-miniatures were used in hearing aids and model aircraft controllers. Subminiature tubes were developed as bomb fuses for use in mines and torpedoes. I think indeed the first subminis that came out of the Raytheon plant were intended for proximity fuses. Those were designed with very heavy reinforcement so they could handle heavy acceleration parallel to the plate, and that same technology made them useful in a lot of other low-microphonic applications. Some of the last ones that came out of the plant were spares for the first and second generation B-52 navigation systems, which used a von Neumann machine made up of around 250 submini tubes. In the meantime they went into everything from Army field radios to weather balloons to condenser microphones. They were just a hell of a great technology if you ask me. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
Oddball Raytheon Subminiature Tubes QF-721
On Sat, 13 Aug 2011, Scott Dorsey wrote:
Kenneth Scharf wrote: On 08/13/2011 01:48 PM, Richard Knoppow wrote: Among other applications sub-miniatures were used in hearing aids and model aircraft controllers. Subminiature tubes were developed as bomb fuses for use in mines and torpedoes. I think indeed the first subminis that came out of the Raytheon plant were intended for proximity fuses. Those were designed with very heavy reinforcement so they could handle heavy acceleration parallel to the plate, and that same technology made them useful in a lot of other low-microphonic applications. Some of the last ones that came out of the plant were spares for the first and second generation B-52 navigation systems, which used a von Neumann machine made up of around 250 submini tubes. In the meantime they went into everything from Army field radios to weather balloons to condenser microphones. Not just military stuff. Those Motorola lunchbox type transceivers, something like the P-33 (maybe that was a later model) used subminatures in a hybrid. There were some consumer radios that used them. There was even at least one military general coverage receiver that used them, I can't remember the model but I remember the surplus ads, and it was quite a fancy receiver (so likely the subminature tubes did make a difference there, allowing it to fit into a somewhat reasonable space. Michael VE2BVW |
Oddball Raytheon Subminiature Tubes QF-721
On Sat, 13 Aug 2011 15:14:31 -0400, Kenneth Scharf wrote:
Subminiature tubes were developed as bomb fuses for use in mines and torpedoes. And in proximity fuzes in Anti-Aircraft shells. Those tubes were rugged! -- Cheers, Stan Barr plan.b .at. dsl .dot. pipex .dot. com The future was never like this! |
Oddball Raytheon Subminiature Tubes QF-721
"Michael Black" wrote in message ample.net... On Sat, 13 Aug 2011, Scott Dorsey wrote: Lots of snipping here... Subminiature tubes were developed as bomb fuses for use in mines and torpedoes. I think indeed the first subminis that came out of the Raytheon plant were intended for proximity fuses. Those were designed with very heavy reinforcement so they could handle heavy acceleration parallel to the plate, and that same technology made them useful in a lot of other low-microphonic applications. Some of the last ones that came out of the plant were spares for the first and second generation B-52 navigation systems, which used a von Neumann machine made up of around 250 submini tubes. In the meantime they went into everything from Army field radios to weather balloons to condenser microphones. Not just military stuff. Those Motorola lunchbox type transceivers, something like the P-33 (maybe that was a later model) used subminatures in a hybrid. There were some consumer radios that used them. There was even at least one military general coverage receiver that used them, I can't remember the model but I remember the surplus ads, and it was quite a fancy receiver (so likely the subminature tubes did make a difference there, allowing it to fit into a somewhat reasonable space. Michael VE2BVW I think they were used in a couple of receivers made for the Navy by RCA. I remember seeing the solder-in tubes there. As Scott points out they were also used in some miniature microphones, for instance the Altec-Lansing M-20 system (I have one somewhere). -- Richard Knoppow Los Angeles WB6KBL |
Oddball Raytheon Subminiature Tubes QF-721
In article ,
Scott Dorsey wrote: Kenneth Scharf wrote: On 08/13/2011 01:48 PM, Richard Knoppow wrote: Among other applications sub-miniatures were used in hearing aids and model aircraft controllers. Subminiature tubes were developed as bomb fuses for use in mines and torpedoes. I think indeed the first subminis that came out of the Raytheon plant were intended for proximity fuses. Those were designed with very heavy reinforcement so they could handle heavy acceleration parallel to the plate, and that same technology made them useful in a lot of other low-microphonic applications. Some of the last ones that came out of the plant were spares for the first and second generation B-52 navigation systems, which used a von Neumann machine made up of around 250 submini tubes. In the meantime they went into everything from Army field radios to weather balloons to condenser microphones. They were just a hell of a great technology if you ask me. I think that the first Raytheon subminiatures were from 1938-39 and made possible electronic amplifiers for hearing aids that could be worn in a man's suit. Beltone and Sonotone were producing amplifiers with these tubes that were about the size of a pack of cigarettes in 1940. The proximity fuse tubes were a ruggedized development of an already-mature product made in quantity for a ready civilian market. I don't know when Raytheon last made subminiature tubes, but do know that they were going into new-manufacture missile warhead guidance electronics until the early-mid 1970's. Sonotone did have their own line for subminiature tubes, but I don't know whether that was set up during WWII or afterward. Their first "transistorized" hearing aid hit the market in 1953, but it was a hybrid that still used tubes plus one transistor in a cigarette-pack amplifier. Hank |
Oddball Raytheon Subminiature Tubes QF-721
I don't know when Raytheon last made subminiature tubes, but do know
that they were going into new-manufacture missile warhead guidance electronics until the early-mid 1970's. Production line shut down in 1983, I think. That factory now only makes magnetrons and travelling wave tubes. Sonotone did have their own line for subminiature tubes, but I don't know whether that was set up during WWII or afterward. Their first "transistorized" hearing aid hit the market in 1953, but it was a hybrid that still used tubes plus one transistor in a cigarette-pack amplifier. The Japanese made the things too, and there were other companies like Hy-Vac making them. BUT... as far as the original poster's tube goes, I got a couple from him in the mail and it looks to be a pentode with a 5J pinout. My guess without putting it on the curve tracer is that it is likely to be a CK531DX. I'll try and test it more carefully this weekend. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
Oddball Raytheon Subminiature Tubes QF-721
On 12/08/2011 23:29, Robert Seely wrote:
Hello, My apologies for the intrusion. but I have a question that I am hoping someone has an answer to. I have never posted to a news group, so again, my apologies if this does not meet the standard protocol. I have a bunch of Raytheon Subminiature tubes that I inherited from my Father, who was an electronics bugg (I followed a different path) that have code QF-721. In searching the internet I have found a bunch of identical looking tubes such as one labeled CK6088. I have done lots of searches on the internet and I cannot find out anything about these and am wondering if you know about these, or if you can point me to a website that might shed some light on these. I am considering the possibility of donating these to someone but if I cannot find out what they are for, I cannot imagine how I can find who to donate them to -- perhaps a school or something. Robert, I've seen these over here in the UK, although they were made by Mullard and had type numbers like EF731, 734, etc. I believe they were known for a while (at least in the UK) as "deaf-aid valves" as they were used in a body-worn amplifier for a ear-insert hearing aid. I came across them in a radio-navigation system made back in the early 60s where they were used for RF and IF stages up to about 3 MHz. HTH 'BF |
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