211 Triode Amplifier, Single Ended

 

Roehren: 12AU7, EH 6V6GT , 211 Shuguang
Der Arbeitspunkt: jede 211 Roehre kann einfach und genau mit der NGV eingestellt werden. Die Roehre arbeitet im reinem Klasse A Modus .
Treiber: 6V6GT ist als Triode geschaltet und choke loaded
Klang: sehr ausgewogen, loest feinste Klangdetails auf, laeuft an Boxen mit mittlerer Empfindlichkeit aber auch durch den geringen hum and noise an wirkungsgradstarken Boxen
Abhoerkette : ML 380S, CD Cambridge Audio 851 C, DAC-UP-PCM1794 MK-II
Lautsprecher Box1: 3 Wege, 65 l BR mit internen Helmholtz-Absorber, separates entkoppeltes Mittel/Hochton Gehaeuse, schwimmend gelagerte Schallwand .
Chassis : SEAS CA26RE4X, Accuton C158-8-085, ScanSpeak D3004/662000,
Empfindlichkeit bei 2,82V/1 m : 89dB, Impedanz 6-8 Ohm.

Lautsprecher Box 2: 86 dB , siehe KT120 AGILE


This circuit is designed for a 211 tube, the driver stage consists of a strong tube, 6V6GT as triode connected with choke loaded.The operating point of any 211 tube can be easily and accurately adjusted with the NGV .The tube operates in pure class A mode .
Sound : very detailed, trioden sound , excellent resolution and dynamic performance, runs on boxes from around 86dB or higer.
It is possible to wire the Lundahl output transformer for 4 Ohms or 8 Ohms speakers using the LL9202. For 8 Ohm Speakers, with the Lundahl output transformer LL1691, the 211 SE power amplifier has been tested on various speakers.

211 Schaltung mit freundlicher Genehmigung von Dipl. Ing. J. Leven.
211 Circuit placed here with kind permission of Dipl. Ing. J. Leven.

Are you interested?

Contact information is here

We recommend to use the transformer PCBs.

These do the same as normal wiring by hand will do, but there can be no wiring mistakes, and no wire mess.

In addition, the output impedance can be made switchable between two impedances, or can be made fixed.

Information about the Output Transformers is here

JAC MUSIC Recommended Parts list (most important parts) for one 211 mono block:
TRANSFORMERS
JAC MUSIC
Part Number
LL1691-70mA Lundahl (Big Core Type)
218-186-87
LL9202-85mA Lundahl
218-118-39
LL1667 (Specify current) Lundahl
LL1673-15H Lundahl
218-009-64
EE15 Primary Board for LL9202, Gold plated.
310-015-88
EE16 Secondary Board for LL9202, Gold plated. Can select 4 or 8 Ohms.
310-016-48
EE17 External Switch Option for EE16. Gold plated.
310-017-90
EE18 Secondary Board for LL9202, Gold plated. Can select 8 or 16 Ohms.
310-018-69
EE19 External Switch Option for EE16. Gold plated.
310-019-43
TUBES
JAC MUSIC
Part Number
ECC82, or 6189W Sylvania NOS
114-020-87
ECC802S Tesla Studio Version of ECC82
114-200-39
6V6, smoked Glass Reflektor, Russian NOS
114-068-89
211 Sorry we have no stock
OTHER PARTS
JAC MUSIC
Part Number
MCap Supreme Silver Oil 0.33uF (for 211) Mundorf Germany
323-065-27
MCap Supreme 0.22uF (for ECC82) Mundorf Germany
323-035-67
MCap 0.22uF (for heater of 211) Mundorf Germany
323-003-19
RCA input connector by Yamamoto Yamamoto, nickel free contacts
320-050-29
Ground Bar (Fat wire in schematic) 1.2mm Silver wire. (you need appr. one meter for two amplifiers)
710-023-84