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Re: FS-007

Posted by mqracing (M) on October 28, 2004 at 18:21:27

In Reply to: FS-007 posted by John Q on October 28, 2004 at 09:59:55:

John had asked:

::::Also I lookng for max possible B+ and max primary current ?::::

for B+ I don't recommend going much higher than 600VDC. The reason is that the insulation materials we use are not *ideally* suited for ultra high voltages (say 1000 plus)...

If I were building a transformer for 1,000 volts or higher B+ then I would want to use insulations with good corona resistance. But the drawback is that the materials which tend towards having good corona resistance aren't the materials with the best dielectric K or dissapation factors... the insulation packet in your 007 was optimized for low dielectric K and a very good dissapation factor...

max primary current? It is rated at 60 mils but our ratings are usually conservative... look at for instance our FS-030 and it's current versus inductance meausurements. On the 007 I wouldn't personally go any more than 80 mils... and would try to stick down toward the 60 mil rating... as this conserves the greatest amount of AC magnetic headroom and since it keeps the flux low... the distortion stays low....

what tube and what operating points were you thinking of?

::::If possible the gap size ?::::

this info we do consider proprietary.

:::I ask about the gap size because maybe I like to open it a little::::

I wouldn't recommend this. Your unit is wax impregnated and part of what keeps the e's and i's together is the "adhesive" function or benefit of waxing both the coil and the core.

You could snap it apart... but run the risk of not ever getting it back together as well as we did... and you'd be on your own entirely...

::::Only info I found on web say FS-007 is designed to 60mA.::::

we've sold a bunch in Japan. I can remember years ago asking what folks in Japan was using the 007 for and was told that it was popular with the 71A tube!!!! Which really blew my mind... that's a lot of iron for 800 milliwatts output....

another app I can think of... would be a low voltage 845 tube.... where you can run right around 60 mils or so....

but tell us what you had in mind...

Mike

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