Tubes and power supply

[Mikko Helin]

Sasha & R.G.:

If you are talking about National Semiconductor's LB-47 App Note,
then the transistor mentioned there is NOT MOSFET, it's bipolar
power NPN transistor - or actually there are two in darlington
configuration. Check the BUxxx transistors, like BU206 (800V,3A),
BU500 (700V 6A) or others.

-mikko
>
>>Thanks for the tip, I found it - but, of course, I found problems as
>>well. Would you (or anybody) know the replacement for that obscure
>>MOSFET mentioned there, NSD134? I guess any high-voltage power MOSFET
>>could be used, but then again...
>
>It's not critical. You can use any power mosfet with high enough BVds.
>The IRF820 is a good one. Be sure to use the protection diodes to keep
>power on/off transients from killing the regulator.
>
>By the way, for the items on your web site you list as "stolen from 
>Keen's web site", could you replace those items with links? 
>
>I don't  post anything I really don't want known, but I do update the 
>material and correct mistakes, and you will miss those. I get lots of 
>mail from people about "mistakes" that are from earlier versions of my 
>efforts. Finding my earlier stuff reposted other places makes me less
>eager to post anything else.