And / or try a different osc tube, 1626 ? -Hue >Just trying to think of some things to try...... can you series a pair of 12V car/tractor batteries for a quick test? Mark K3MSB -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.qth.net/pipermail/arc5/attachments/20200420/a60572cd/attachment.html>