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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Tue Dec 01, 2009 8:30 pm Post subject: |
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I do not know what type they are.
Scott
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Wed Dec 02, 2009 1:14 am Post subject: |
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Under normal conditions wire wound resistors would work fine. I do not know how they would handle arcs, though. The specs should define the overload capabilities.
Those resistors are the series resistors in a shunt regulator circuit for the G-2 output. There are two for each G-2 output. Are these resitors in series or parallel? The input side probably has a couple of hundred volts more than max G-2 output applied. So maybe +1500V on one side, anywhere from about 300V up to 1000V on the other. If the G-2 arcs to ground that puts about the full +1500V across the series or parallel network. If the G-2 arcs to the anode (+34kV) then whatever voltage the spark gaps clamp at is across the network. They need to be able to handle that if that ever happens.
Scott
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"Were we directed from Washington when to sow and when to reap, we would soon want bread."
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Wed Dec 02, 2009 1:32 am Post subject: |
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| tse wrote: | Under normal conditions wire wound resistors would work fine. I do not know how they would handle arcs, though. The specs should define the overload capabilities.
Those resistors are the series resistors in a shunt regulator circuit for the G-2 output. There are two for each G-2 output. Are these resitors in series or parallel? The input side probably has a couple of hundred volts more than max G-2 output applied. So maybe +1500V on one side, anywhere from about 300V up to 1000V on the other. If the G-2 arcs to ground that puts about the full +1500V across the series or parallel network. If the G-2 arcs to the anode (+34kV) then whatever voltage the spark gaps clamp at is across the network. They need to be able to handle that if that ever happens.
Scott |
So it has to have a 1500 working voltage? i dont even think the original carbon comps have that rating? And carbon film I don't think would handle it either. I know some tantalums i was looking at can go to 1200 but not sure. isnt the max G2 to the VNB's 600 VDC? So a couple hundred more would be under 900, 1000v to be safe. But that is in the 2 watt range, the specs would go up if we went to 3 watt value. I'm not changing the ones in my Longbows as they look good as is in that circuit.
I think PRP makes a wirewound that look like the ones in my pics. Have to find some sepcs.
Athanasios
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antorsae
Joined: 16 Jul 2006
Posts: 297
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| Posted: Wed Dec 02, 2009 10:58 am Post subject: |
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WOW Nash - I took a look at the PRP resistors and those look really nice. If you are as thorough in your restaurant as you are with electronics I'll take a plane to visit you just to eat in your restaurant! 
If you are going to order those resistors or samples, let me know - I'd like to get some too.
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Nashou66
Joined: 12 Jan 2007
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Location: West Seneca NY
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