bfranchuk at jetnet.ab.ca
Fri Apr 22 23:09:03 CDT 2005
Tony Duell wrote:
>The batteriers are long-since unobtainable (at least not easily). I run it
>from the mains. The LT is triival to get from my bench aupply. For HT,
>I've made a little PSU from common components that gives about 85V (high
>enough for the set to work well). It's just a 30V transformer feeding a
>voltage doubler circuit. Much easier to get a 30V transformer than
>something of a higher voltage now.
>I must try the circuit that was in Elektor a couple of months back to get
>90V from low-voltage batteries.
Also with the low cost of power fets a simple zener diode voltage
regulator is peanuts in cost to
do. The only catch is the case is HT in. With a simple one or two tube
set some 5 watt zener diodes
might work better.
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