211 A2 Amplifier211 tube amplifiers have always delivered a nominal 12 to 20 watts in Class A operation and gained acceptance for this service. As a means to deliver more power from the 211 tube, we at Electra-Print Audio have updated the traditional design using Class A2 operation delivering easily over 40 watts due to higher swing high voltage music power. The purpose of the design is to operate a less expensive, easily obtained popular tube, in a practical and acceptable high powered circuit.
Circuit DescriptionView our Tech Blog to find a full description of this unique amplifier design. Power supply and amplifier stages are fully covered.
SchematicsClick on the links below to see the schematics:
Resulting operational features:
a] No feedback on a very high voltage swing results in extremely good amplitude linearity. No global feedback giving greater dynamics to the music. b] High frequency has low distortion due to electrostatic shielded partial silver secondaries. c] Headroom over 10 watt listening level is over 400%. d] Not a feature but note worthy, is the 20 Hz higher distortion due to output transformer core mass limit to practicality. This will exist on all SE amplifiers to some degree as core mass used. e] Our Electra-Print amplifier design emphasizes the most important things found in recorded music including, detail, dynamics and presence.
Parts we can supply:
Amplifer Transformer prices:
|211ESE10K||$382.75||SE, PSSS Secondary, 6 Ohms, Electrostatic Shield|
|A2LD-7||$137.50||Common Mode Driver|
Power Supply Transformer prices:
|211 Pwr||$319.00||M6 Laminations|
|3030||$37.50||HV Filter Choke|
|FC3.5A||$26.50||Filament Choke, 3.5 Amp|