I had no problem downloading it tonight, dunno what was going on last night
Either my ISP or their site was experiencing a bit of a SNAFU
Field coil speaker and no fuse, that's REALLY old school , mid to late 1930s, to just before WWII... With 275V B+, they're running each of those 6L6s pretty lightly, around 12.5 W combined , Plate and SG dissipation.
Some of its circuitry looks like it was lifted right out of RDH3...
"M" is the really old school way of expressing " X 1000 Ohms", must have been using the Romal numeral M, instead of the more modern "K".
The notion of picofarads and nanofarads had not yet entered the field of electronics design, so they used MF or MMF, and a thosand ohms could be expressed with either M or K. So, M could mean "a thousand" or "Micro", depending on when and where they were applied. The lower case "u" micro had not yet been universally adopted. Confusion reigned, I'm sure
Frequency waw still expressed in Cycles, Kilocycles and Megacycles, microwave did not uyet exist, and in its early days, those were expressed as KiloMegaCycles rather than today's "GigaHertz".
/ed B