small valves

[woodelf]

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.

>-tony
>  
>