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#1
November 17th 09, 04:20 PM
posted to rec.radio.amateur.equipment,rec.antiques.radio+phono
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Looking for BIG power resistors
In article , " wrote:
On Nov 16, 9:46=A0pm, "Steve" wrote: I'm in the process of restoring a WWII vintage transmitter. So far I've been able to use all of the original parts but some of the bleeder resistors in the HV supply are bad. Hoping someone has these in their junkbox; 25K ohm 80 watt; =A0these are 11.5" long and 1.125" in diameter, ceramic with cartridge type ends. Made by Groves Corp (bit this isn't important). Need at least two of these. Not exactly original but ceramic tubular resistors are still made today by Vishay, Bourns, etc. Ohmite. I just bought a 225 watt 2.5K last week from Allied. greg See e.g. HL10006Z25K00JJ For the same wattage the modern ones are probably a factor of two smaller. The other resistor is really one of those old style ceramic floor heater elements. It has wire wound on a ceramic cone and uses a standard light bulb base. 220 volts, 660 watts. This monster is put in series with the primary of the plate transformer for "low power tuning". Chuckle... Might want to think about a large-wattage 220V light bulb dropped in. Light bulbs are interesting circuit elements, often usable on purpose for the way the resistance increases as they heat up. Tim. |
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