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#1
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Glass resistors?
Picked up a B&K 707 tube tester last weekend and a lot of the resistors have strayed, so i plan to replace them. After looking in the parts list they have them listed as "glass" resistors.....huh? I may have only been messing with tube equipment for about 3 years now, but i have never heard of these. I'm presuming they would be modern metal oxide? The wattage ranges from 3 to 7. Thanks for any help, -Steve- |
#2
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"Nuclear" wrote in message ... Picked up a B&K 707 tube tester last weekend and a lot of the resistors have strayed, so i plan to replace them. After looking in the parts list they have them listed as "glass" resistors.....huh? I may have only been messing with tube equipment for about 3 years now, but i have never heard of these. I'm presuming they would be modern metal oxide? The wattage ranges from 3 to 7. ** Hmmmm, could be a reference to "Cermet" or "Metal Glaze" resistors. These are a mixture of ceramic ( glass ?) and metal particles which are then "glazed" to make a resistive coating on a ceramic tube - which is then automatically spiral cut to create the desired resistance value. Usually specified where high power/temp ratings are needed and factors like excess noise voltage are of no importance. ............ Phil |
#3
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Yeah i was thinking a wirewound would be ok too. It's just the fact there are some common wirewounds in there already besides these odd looking green resistors. No color code, but the values are printed on there, and they're as big as a wirewound. -Steve- On Thu, 6 Nov 2003 17:31:29 +0100, "Ronald" wrote: Hi Steve , I think glass was used in that days to make a non-inductive R that can handle some power . I would try just any R to replace it . It's "just" a tester .... Might be a wire wound will do .... Ronald . "Nuclear" schreef in bericht .. . Picked up a B&K 707 tube tester last weekend and a lot of the resistors have strayed, so i plan to replace them. After looking in the parts list they have them listed as "glass" resistors.....huh? I may have only been messing with tube equipment for about 3 years now, but i have never heard of these. I'm presuming they would be modern metal oxide? The wattage ranges from 3 to 7. Thanks for any help, -Steve- |
#4
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Nuclear wrote:
Picked up a B&K 707 tube tester last weekend and a lot of the resistors have strayed, so i plan to replace them. After looking in the parts list they have them listed as "glass" resistors.....huh? I may have only been messing with tube equipment for about 3 years now, but i have never heard of these. I'm presuming they would be modern metal oxide? The wattage ranges from 3 to 7. Thanks for any help, -Steve- They have a very specific use, although I forget what for. I think they were mentioned on www.fusor.net in the discussion group for use with photomultipliers and were of a very high value. They are fairly expensive I understand. |
#5
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"Mark Harriss" wrote in message ... Nuclear wrote: Picked up a B&K 707 tube tester last weekend and a lot of the resistors have strayed, so i plan to replace them. After looking in the parts list they have them listed as "glass" resistors.....huh? I may have only been messing with tube equipment for about 3 years now, but i have never heard of these. I'm presuming they would be modern metal oxide? The wattage ranges from 3 to 7. Thanks for any help, -Steve- They have a very specific use, although I forget what for. I think they were mentioned on www.fusor.net in the discussion group for use with photomultipliers and were of a very high value. They are fairly expensive I understand. I have a bk 707 and the original book and schematic for it. I looked on the parts list and the 150 ohm is a 4 watt 5% and the 18k is a 4 watt 10% and all others are 7 watt 5% |
#6
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Thompson Family wrote:
I have a bk 707 and the original book and schematic for it. I looked on the parts list and the 150 ohm is a 4 watt 5% and the 18k is a 4 watt 10% and all others are 7 watt 5% Oops! I didn't read the original posting too closely. Aren't glass resistors a very high stability resistor?. Mark Harriss |
#7
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Nuclear wrote:
Picked up a B&K 707 tube tester last weekend and a lot of the resistors have strayed, so i plan to replace them. After looking in the parts list they have them listed as "glass" resistors.....huh? I may have only been messing with tube equipment for about 3 years now, but i have never heard of these. I'm presuming they would be modern metal oxide? The wattage ranges from 3 to 7. Thanks for any help, -Steve- Victoreen was a manufacturer of glass resistors but seems to me they were for high resistance applications. I recall them as a source for those kinds of parts 40 years ago. We used the with photomultipliers & electrometers. Looked at Victoreen on Google. No mention of resistors on their site now. Not sure what they would be doing in a tube tester. JLS |
#8
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Victoreen was a manufacturer of glass resistors but seems to me they were for high resistance applications. I recall them as a source for those kinds of parts 40 years ago. We used the with photomultipliers & electrometers. Looked at Victoreen on Google. No mention of resistors on their site now. Not sure what they would be doing in a tube tester. JLS I do believe Corning also made them years ago, before they got swallowed up by Vishay. A.Cirella, Handmade www.hndme.com |
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