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#1
October 9th 07, 09:07 PM
posted to alt.binaries.pictures.radio
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Type 488 tube
Some photos of an unusual tube I got in a box full. It appears to be a
triode. The only numerical marking I can find indicates a Type 488. I can't find any information on the usual spots on the web. I made a shot from the front showing the mesh plate structure and a shot from the top. I tested it in my tester as a 26 but with 6.3V on the filament and it tested well in the "Good" zone. Testing as a 45 @ 6.3V on the filament increased the purple glow and it still tested in the "Good" zone. Does anybody know what this tube is? Raymond |
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#2
October 9th 07, 09:57 PM
posted to alt.binaries.pictures.radio
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Type 488 tube
The only 88s I'm aware of are all rectifiers. Is it possible that
someone swapped bases with another tube? Alan |
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#3
October 9th 07, 10:18 PM
posted to alt.binaries.pictures.radio
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Type 488 tube
Alan Douglas wrote:
The only 88s I'm aware of are all rectifiers. Is it possible that someone swapped bases with another tube? Alan Alan, Here's a shot of everything on the base. Most of it's not intelligible except for the 488 designation. Do I have a one-of? Raymond |
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#4
October 9th 07, 11:08 PM
posted to alt.binaries.pictures.radio
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Type 488 tube
On Tue, 09 Oct 2007 15:07:36 -0500, Raymond Koonce
wrote: Some photos of an unusual tube I got in a box full. It appears to be a triode. The only numerical marking I can find indicates a Type 488. I can't find any information on the usual spots on the web. I made a shot from the front showing the mesh plate structure and a shot from the top. I tested it in my tester as a 26 but with 6.3V on the filament and it tested well in the "Good" zone. Testing as a 45 @ 6.3V on the filament increased the purple glow and it still tested in the "Good" zone. Does anybody know what this tube is? Raymond I assume that testing did not involve anything except emission, so Alan may be right that it may be a diode. But it seems from the photo that there may be a grid there? Certainly it is gassy, so not really useable. Peter Dettmann |
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#5
October 9th 07, 11:55 PM
posted to alt.binaries.pictures.radio
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Type 488 tube
"Peter Dettmann" wrote in message ... On Tue, 09 Oct 2007 15:07:36 -0500, Raymond Koonce wrote: Some photos of an unusual tube I got in a box full. It appears to be a triode. The only numerical marking I can find indicates a Type 488. I can't find any information on the usual spots on the web. I made a shot from the front showing the mesh plate structure and a shot from the top. I tested it in my tester as a 26 but with 6.3V on the filament and it tested well in the "Good" zone. Testing as a 45 @ 6.3V on the filament increased the purple glow and it still tested in the "Good" zone. Does anybody know what this tube is? Raymond I assume that testing did not involve anything except emission, so Alan may be right that it may be a diode. But it seems from the photo that there may be a grid there? Certainly it is gassy, so not really useable. Peter Dettmann Voltage regulator, maybe? |
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#6
October 10th 07, 03:14 PM
posted to alt.binaries.pictures.radio
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Type 488 tube
"Brenda Ann" wrote in message ... "Peter Dettmann" wrote in message ... On Tue, 09 Oct 2007 15:07:36 -0500, Raymond Koonce wrote: Some photos of an unusual tube I got in a box full. It appears to be a triode. The only numerical marking I can find indicates a Type 488. I can't find any information on the usual spots on the web. I made a shot from the front showing the mesh plate structure and a shot from the top. I tested it in my tester as a 26 but with 6.3V on the filament and it tested well in the "Good" zone. Testing as a 45 @ 6.3V on the filament increased the purple glow and it still tested in the "Good" zone. Does anybody know what this tube is? Raymond I assume that testing did not involve anything except emission, so Alan may be right that it may be a diode. But it seems from the photo that there may be a grid there? Certainly it is gassy, so not really useable. Peter Dettmann Voltage regulator, maybe? Thyratron? |
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#7
October 10th 07, 03:57 PM
posted to alt.binaries.pictures.radio
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Type 488 tube
"ian field" wrote in message ... "Brenda Ann" wrote in message ... "Peter Dettmann" wrote in message ... On Tue, 09 Oct 2007 15:07:36 -0500, Raymond Koonce wrote: Some photos of an unusual tube I got in a box full. It appears to be a triode. The only numerical marking I can find indicates a Type 488. I can't find any information on the usual spots on the web. I made a shot from the front showing the mesh plate structure and a shot from the top. I tested it in my tester as a 26 but with 6.3V on the filament and it tested well in the "Good" zone. Testing as a 45 @ 6.3V on the filament increased the purple glow and it still tested in the "Good" zone. Does anybody know what this tube is? Raymond I assume that testing did not involve anything except emission, so Alan may be right that it may be a diode. But it seems from the photo that there may be a grid there? Certainly it is gassy, so not really useable. Peter Dettmann Voltage regulator, maybe? Thyratron? formerly used at ALCOA for the electric furnaces....... ;~) |
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#8
October 10th 07, 04:23 PM
posted to alt.binaries.pictures.radio
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Type 488 tube
In article WL5Pi.15410$Cd7.9085@trnddc03,
"Paul P" REMOVE paul @ REMOVE ppinyot . REMOVEcom wrote: "ian field" wrote in message ... "Brenda Ann" wrote in message ... "Peter Dettmann" wrote in message ... On Tue, 09 Oct 2007 15:07:36 -0500, Raymond Koonce wrote: Some photos of an unusual tube I got in a box full. It appears to be a triode. The only numerical marking I can find indicates a Type 488. I can't find any information on the usual spots on the web. I made a shot from the front showing the mesh plate structure and a shot from the top. I tested it in my tester as a 26 but with 6.3V on the filament and it tested well in the "Good" zone. Testing as a 45 @ 6.3V on the filament increased the purple glow and it still tested in the "Good" zone. Does anybody know what this tube is? Raymond I assume that testing did not involve anything except emission, so Alan may be right that it may be a diode. But it seems from the photo that there may be a grid there? Certainly it is gassy, so not really useable. Peter Dettmann Voltage regulator, maybe? Thyratron? formerly used at ALCOA for the electric furnaces....... ;~) Also commonly used in vacuum tube era modulation monitors for AM broadcast stations. Regards, John Byrns -- Surf my web pages at, http://fmamradios.com/ |
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#9
October 10th 07, 12:09 AM
posted to alt.binaries.pictures.radio
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Type 488 tube
All I can guess is that someone used a dud tube to test the
hot-stamping dies. The longer name looks vaguely familiar ("Commander" first came to mind which was a Chicago maker I think). Alan |
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#10
October 10th 07, 01:05 AM
posted to alt.binaries.pictures.radio
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Type 488 tube
Alan Douglas wrote:
All I can guess is that someone used a dud tube to test the hot-stamping dies. The longer name looks vaguely familiar ("Commander" first came to mind which was a Chicago maker I think). Alan Thanks for your input Alan. |
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