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? What failure does the HV fuse protect against with thoriated tungsten filament tubes?

Nice pix of the 6 mtr project. Looks like you have done layout work before. Living in Lufkin, TX, do you work for the measuring device outfit? Have an old Lufkin 50 ft. tape measure that must be 60-70

pentalab wrote:

pentalab wrote: <snip> There's nothing better! > <snip> Jim, have you considered sub mounting the tube? Current methods dictate cutting lots of holes around the tube to allow the air to flow. If you

repairing 500 pf prevent grid- filament shorts. ### agreed... when stuff "goes nuts"... the glitch will LIMIT current..... precede the glitch with a HV fuse... and that combo is excellent. Come glitch

Kathy&#92;(K5MWH&#92;)" <w5uc@...> wrote: 6 mtrs see my #### then click on..."stuff" I tried the pi net for my tuned inputs.... and it's slick.... since it does ALL bands at once. By tweaking the Q in

### Have not tried this... yet. You would have to anchor it down to the chassis... otherwise, it would obviously get blown through the celing ! Since our local plastic shop has miles of thin teflon

In my experiences, a suitable glitch-R in the HV+ helps prevent grid- filament shorts.

Will, I agree. When you design a transformer for 10 KG there is an oversized core or extra windings both of wich increase the resistance losses. This same transformer at 50 Hz. will be more efficient

Materials like kapton insulators are rated at 7000 volts / mil do a better job than a layer of paint. This is required when you build high voltage transformers. Low voltage you can rely on wire

Thanks who reply about my questions. My teacher in university, Prof. Chen, He often made some R xfmr,use 100VA iron for 180VA xfmr, he do like this,primary and secondary must need apart.Use as thick

Gents, It would do us all good if we tried to make our subject line match what we talk about in our postings. Otherwise, the thread is completely disjointed and very difficult to follow. When the

Francis, If we took a transformer say designed to run at 10 kilogauss, but the iron would run okay at 12 kilogauss, then dropped the frequency down to 50 Hz, it would probably be okay since the flux

I received a lot of interesting posts when I asked about repairing a grid bypass choke fire on a customer's SB-220. The most suggested fix I received was to strap all grid pins to chassis ground,

Will, I lived it once and was unable to make the loss equal for both 50 and 60 Hz. I got close but the 50 Hz high line started to suck current. frank wa1gfz craxd <craxd1@...> wrote: Francis,

Francis, Yup, your right. I was going by the difference in the two formulas between 50 and 60 Hz. Both sets have a difference of 1.2. See below; For 60 Hz TPV = 4.85 / A A = 0.1725 x sq rt of P P = (

I forgot about Hsu being overseas. He would have a 50 Hz transformer and the formula I showed was for 60 Hz at 12 kilogauss. The one for 50 Hz is; TPV = 5.82 / a a = 0.206 x sq rt of P P = ( a / 0.206

Will, untrue all you need to do is make the core bigger to reduce the flux at 50 Hz. Volts per turn stay the same. Wire will be a bit longer due to bigger window. So bigger core makes more resistance

That is exactly why 400 Hz. is used in aircraft. but then some nut decided to do 270 VDC and kill people working on them. All to save the constant speed generator shaft interface. A 50 Hz. transformer

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