H.D.Arnold Electron Discharge Amplifier Dec. 30, 1924

Εὖρος Eurus

5693, 2A3 SE amplifier with Tango XE-20S output reansformers.

 In Contrast to  Aura, Εὖρος EURUS is a red, hot, furious little amplifier. It employs a pair of 2A3 and a pair of 5693 in (pentode mode) tubes, the output transformers are Tango XE-20S. Listening to music with this little amp is a divine experience.

5693, 2A3 SE amplifier with Tango XE-20S output reansformers.
Schematic of 5693, 2A3 SE amplifier with Tango XE-20S output reansformers.

Αὔρα ‘Aura’

E86C, 2A3 SE amplifier with Tango XE-20S output reansformers.
Bottom view of E86C, 2A3 SE amplifier with Tango XE-20S output reansformers.
Schematic of E86C, 2A3 SE amplifier with Tango XE-20S output reansformers.

 This amplifier can produce 4.5 Watt per channel. It is a breath of fresh air its name is Αὔρα Aura . It employs a pair of 2A3 and E86C tubes, the output transformer is Tango XE-20S.

Ὠρίων ‘Orion’

EC8010, 300B parallel feed SE amplifier.

 This little Giant amplifier is ΩΡΙΩΝ, Orion, and employs a pair of 300B output tubes in parallel feed configuration and a pair of 8556 aka EC8010 driver tubes . 

 There were no shortcuts for the components used in this amplifier , on the contrary it is a ridiculously over-designed and heavy amplifier for its output power . 

 Heavy is also the CO2 footprint of the amp and it certainly does not conform to DIN .

Bottom view of EC8010, 300B parallel feed SE amplifier.
Schematic of EC8010, 300B parallel feed SE amplifier.

Ἑκάτη ‘Hekate’

E90CC, EML20B SE Amp.

 This tiny magic amplifier can produce 2.5 Watt per channel that is enough for high sensitivity loudspeakers to be played at moderate levels.

The name is  EKATH , Hekate , and employs a pair of EML20B and E90CC tubes, the output transformer is LL2735B.

Bottom view of E90CC, EML20B SE Amp.

Πανδώρα ‘Pandora’

D3A, 2A3 PP amp with Tamura F-683 output transformers.

 Very few people know that when ΠΑΝΔΩΡΑ, Pandora, opened her box, one of the demons released was the Push-Pull configuration that hounds us down until today. 

  This amplifier is in Push-Pull configuration and is built around a pair of D3A and a quad of 2A3 tubes. It employs a pair of Lundahl LL1660 interstage transformers and a pair of Tamura F-683 output transformers.

Schematic of D3A, 2A3 PP amp with Tamura F-683 output transformers.

Ἑστία ‘Hestia’

EC8010, 2A3 SE amp with intrstage LL1660 Transformer.

 ΕΣΤΙΑ, Hestia ( latin Vesta ), is the fire place, home, a place of comfort as most of the 2A3 amplifiers I have listen to or built. 

 There has to be something completely wrong if an 2A3 amp does not sound exquisitely.

Schematic of EC8010, 2A3 SE amp with intrstage LL1660 Transformer.

Ἥφαιστος ‘Hephaestus’

The Flagship of M-Amps. WE417A - EML 300B XLS - EML 520 XLS.

  And the name of this amplifier shall be ΗΦΑΙΣΤΟΣ , Hephaestus (lat.Vulkan) .

  Hephaestus was the god of technology, metallurgy and fire among others. He symbolises the transaction from agricultural to industrial society thus the belief that he was physically deformed.

  His wife was the adulterous Aphrodite and that leads us to the conclusion that industrialists get the best , but there is still place for others.

 The name ΗΦΑΙΣΤΟΣ refers to the operating heat

and the industrial look of the amplifier.

This is a large amplifier  employs : 

E806C - EML 300B XLS - EML520B or : 

E806c - EML 300B XLS - EML1605.

Rated power output 20 - 25Watts.

Schematic of the The Flagship of M-Amps. WE417A - EML 300B XLS - EML 520 XLS.

NICE PICTURES OF OLD STUFF