Price: 2150 EUR excluding shipping.
The topology is fully balanced, open loop (no gNFB) amp with parafeed transformer output. Citadel is all balanced. Fully balanced means each stage from XLR inputs, the potentiometer, all active stages and output are balanced, from start to finish. CCS loaded source followers drive the output tube grids. The grid drivers relieve the input tube of any drive duty. Tubes do only voltage amplification. Tubes do what they do best and FETs do what they do best, supply current.
All tube anodes are gyrator loaded. Both B+ and B- supplies are regulated.
Citadel gets rid of any “impurities” that the SE input stage in Oblivion might add. This gives the amp a cleaner sound with even lower THD while Oblivion will have some of the old “tube sound”.
This amp can drive most headphones from very low impedance up to high impedance with ease. It’s also capable of driving speakers.
The speaker outputs are also balanced, meaning the black terminal is not ground but is carrying signal in anti-phase to the red terminal. This is a great way to drive a speaker coil.
Custom version of Citadel with silver chassis and 6P7S output tubes
Height: 225mm including spikes and tubes.
Depth: 350mm incl. knobs and speaker outputs.
Width: 435mm, faceplate is 450mm.
2 x 6H9C (6SL7) for input stage
4 x 6P31S (EL36) for output stage
Balanced 2 x 3-pin XLR
Balanced 4-pin XLR
2,7W into 4 ohms, 2W into 8ohms, 1W into 20 ohms, 250mW into 100 ohms, 85mW into 300 ohms.
With optional impedance switch:
Low: 2,7W into 4 ohms, 2W into 8 ohms, 1W into 20 ohms, 250mW into 100 ohms, 85mW into 300 ohms.
High: 2,6W into 20 ohms, 700mW into 100 ohms, 240mW into 300 ohms.
Speaker outputs with selector switch: 175 EUR
Line level RCA outputs (for active subwoofer): 60 EUR
Low/high impedance switch: 120 EUR
Pre-amp outputs (3-pin XLR) with selector switch: 175 EUR
SE ¼” headphone jack with switch: 130 EUR
RCA single ended inputs: 65 EUR
Please visit the contact page to order or ask any questions.