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#1
Posted to rec.audio.tubes
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"Industrial Control Transformers" for HV supplies
Many SET builders like to use "industrial control transformers" for
power supplies. I looked through some catalogs and noticed a few things: 1. The vast majority are designed to be mounted in electrical junction boxes and have the taps on the top. The few with flying leads, again, have them coming out the top. 2. Usually they have symmetrical groups of windings for 115, 230, or 460 volts., no center taps. So you tend to get awkward voltages either on the lowish or highish side if you use capacitor filters. Choke filters are not really feasible unless you build a separate power supply chassis and even then they get expensive if you want reasonable power levels. 3. Of course there is no heater or bias supply winding. So separate supplies are de rigeur. For most projects, using guitar amp transformers is the best way to go especially if you can get them at dealer pricing. |
#2
Posted to rec.audio.tubes
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"Industrial Control Transformers" for HV supplies
On Nov 9, 2:29*am, wrote:
*Many SET builders like to use "industrial control transformers" for power supplies. I looked through some catalogs and noticed a few things: 1. The vast majority are designed to be mounted in electrical junction boxes and have the taps on the top. The few with flying leads, again, have them coming out the top. *2. Usually they have symmetrical groups of windings for 115, 230, or 460 volts., no center taps. So you tend to get awkward voltages either on the lowish or highish side if you use capacitor filters. Choke filters are not really feasible unless you build a separate power supply chassis and even then they get expensive if you want reasonable power levels. *3. Of course there is no heater or bias supply winding. So separate supplies are de rigeur. *For most projects, using guitar amp transformers is the best way to go especially if you can get them at dealer pricing. A couple of brief answers, some humorous, some not so much. a) SET builders tend to be a few geese short of a gaggle in any case, so the configuration of the transformer will not be at issue. Given the intended results, awkwardness adds to the appeal. b) Quite a few pieces of vintage equipment that I have had come across my bench recently (Tandberg, as it happens) has top-lead transformers. Given that common sense (which isn't, really) suggests that there should be a cage over hot equipment, where the leads are has no bearing on function. c) Expensive - see a) above. From what I have seen here and elsewhere, the higher the cost-per-watt of a SET design, the more pride its designer takes in it. d) Separate Supplies - see a) above. e) Guitar Amp transformers would make common sense and as noted, probably at a lower cost. See a) above. Peter Wieck Melrose Park, PA |
#3
Posted to rec.audio.tubes
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"Industrial Control Transformers" for HV supplies
Hi RATs!
Once again, disparaging thoughts about other people inspire vague psychodramatic posts from really bored guys. Sorry, I know nothing of electrical circuitry or acoustics, but, I truly love to insult those people ... ****** is as ****** does, eh? Happy Ears! Al |
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