Note : PL36 is the equivalent of 6CM5/EL36, albeit with 25V / 300mA filament requirement. Octal Beam Power Tube There aren’t many people having used the 6CM5 / EL36 for audio circuits, but it doesn’t mean I will leave those 40 PL36 resting in their box for too long, despite Read more…
Understanding wattage for the amplifiers Article by Paul Joppa, Bottlehead: Most ordinary solid-state amplifiers put out more than enough power for most ordinary speakers. Single-Ended Tube amplifiers need high efficiency speakers to attain the loudness most audiophiles want. Over the years, I have tried to gather enough data to make Read more…
Modifying an electrophoresis generator for lab usage Hoefer PS500XT – Electrophoresis HV power supply modified for tube lab purpose. 500V at 400mA should suffice for many circuit developments. Changes : replace the large on/off/timer switch by an isolated, quick-to-operate, safe switch added a fan on the back, outside of the Read more…