When the almost extinct carbon anode 6080 valves needed replacing Glenn modified it to take carbon anode 6336 valves doubling the power to 20w. This entailed a re-build with extra transformers and Rhopoint non-inductive resistors in key positions. The lid was cut to aid cooling.
The Loth-X are the best-sounding unmodified full-range drivers ever with beautifully machined frames, stiff cone-doping giving a pistonic movement (no folding) and high quality speaker terminals etc. 104db to 108db sensitivity – horn cab dependent.
Flat 8 ohm and extremely rare as were not sold separately from speaker cabs.