Luna tube phono preamplifier er topmodellen i Trafomatic Audios produktserie.
Her anvendes kun de bedste materialer, fx fire C3g SE rør tilsluttet i triode
mode, to mellemtrin, to line out og LL1941 input MC step up.
The main advantage is that this preamplifier use
very rare LCR method to apply the RIAA correction due to complexity and cost.
a total of only the finest components such as four C3g SE tubes connected in
triode mode , two interstage and two line output transformers as well as LL1941
input MC step up .
This preamplifier also applies the separately executed
power supply used low induction toroidal transformer as well as two high
inductivity chokes and Mundorf MLytic HV electrolytic capacitors.
Luna features :
- Built in step up transformers
Switches ground plane with input selection preventing ground loops
- Balanced and unbalanced output
- Separate low impedance CLC power supply
Luna uses two tube gain stages
with zero feedback and passive LCR equalizer .
The input stage as well as
output is low noise Siemens c3g German Post tubes used in triode connection.
Every stage is loaded by transformers and this provide complete isolation of
this sensitive circuit from the following components.
There are no
capacitors in signal way except in RIAA correction where we used Silver mica
Single-ended Class A Separate power supply
Gain: MM –
45 dB, MC – 70 dB using input transformers LL1941 (uncut amorphous cobalt core,
Cardas high purity copper wire)
Noise and Hum: 78 dB
MM (RCA) – 47k
Adjustable MC inputs: 10ohms, 20
ohms, 50 ohms, 100 ohms
Output Impedance: 660 Ohms, XLR and RCA
Frequency Response: RIAA Curve +/- 0.4 dB
Vacuum Tube Complement: 4 x C3g
Power supply: Low Induction toroid transformer by Trafomatic Audio,
High Inductivity custom made chokes, Mundorf MLytic HV type
100, 117 or 240 Volts / 50-60 Hz, 60 watts
Weight: 10 kg
Dimensions: 400x 310 x 85mm (two box)