Rebuilding TV CRTs used to be quite common. Slice neck off tube, "re-gun", melt neck back on, suck out air, profit!. A few years back I found a place that would re-gun (or attempt to) the CRT from an HP9100A calculator. ------------------------ > The only "rebuildable" (vacuum) tubes I've seen are things like very high power transmitting tubes, high voltage rectifiers, and high power ignitrons or mercury arc rectifiers.

All of those places are pretty much gone. The last place locally in Milford Ma fell apart literally after the person that knew anything passed away. The last thing they were rebuilding and could make money at were tubes for fighter air craft sold as surplus. I was lucky to see the place and parts before the building was destroyed. It was a dangerous building in a lot of respects. Various old new glass supplies and such still in the stock rooms. Chemicals and more. Regards Paul WB8TSL On Mon, Oct 31, 2016 at 8:57 PM, Mark Sims <holrum@hotmail.com> wrote: > Rebuilding TV CRTs used to be quite common. Slice neck off tube, > "re-gun", melt neck back on, suck out air, profit!. A few years back I > found a place that would re-gun (or attempt to) the CRT from an HP9100A > calculator. > > ------------------------ > > > The only "rebuildable" (vacuum) tubes I've seen are things like very > high power transmitting tubes, high voltage rectifiers, and high power > ignitrons or mercury arc rectifiers. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. >