No18 set power source

[Chris Suslowicz]

Pietro Noto in Italy used to make a small inverter module that used a 6-volt sealed lead-acid battery to provide all the necessary voltages (3 volts for the valve filaments, -12V grid bias & +150V HT), but I'm not sure if he is still doing that.

You could take a 996 lantern battery apart and connect it in series/parallel for the 3-volt supply (that was the make-up of the original LT section, two pairs of 'F' cells in series/parallel), and 8 x AA cells in a holder for the grid bias section, but the 150 volts will always be a problem.

(I regret not buying some of those inverters when I had the opportunity.)
Chris.

[Bruce MacMillan]

drop Pietro an email and ask about availability. pietronoto@tiscali.it
I have one for my WS48 which is the same. Besides the battle battery a static battery was available which was comprised of different batteries in a box. 16 or 17 9V batteries in series should be ok for HT.

[Mike Gurr]

Thank you both, I will email him.

[Mike Gurr]

Reply from Pietro today, he does still make them but out of stock until the end of next month. A great result again for the power of MLU!