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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: just be aware... posted by Dave Cigna on March 26, 2007 at 15:47:36:
Hi.Like everything else, overheating is no good which includes the glass body of a power tube - something we concern the least.
Yes, the temp coeff of NiCr wire (say common 80/20) is 0.00011R/R/C. (20C ref). Copper is 0.00393R/R/C which is 35.7 times of 80/20 NiCr resistance wire.
But for a couple or more temp C increase across a few feet of magnic wires (min 200C rated), as I found out from my installation (finger feeling only), & with voltage drop monitoring for a few hours on a dummy resistive load (IDH tube heaters I measured pretty linear & behave pretty pretty close on AC power to resistance load), there would not be an issue.
Of course, proper ventilation always help. That why I installed the inductor former close to the tube sockets & tightly against the chassis bottom surface with small ventilation pores drilled ontop.
c-J
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Follow Ups
- Good concern ! - cheap-Jack 09:19:26 03/27/07 (0)
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