On offer is a Dealer Demo Rethm Gaanam 6C33C SET Class A Integrated Tube Amplifier in Mint condition with no more than 10 hours of playtime on the amp and the tubes.
We have 2 amps available, one in Light Maple wood trim finish and the other in Dark Rosewood.
ABOUT THE DESIGN
The criteria Rethm started with were the following:
1. It had to be Single Ended pure class A. 2. It had to deliver a "Big Tone Tube" sound.
Rethm use a circuit for the power amp section using 6C33C tubes as the output tubes, driven by NOS Russian military 6N6P triodes. The preamp / input section, implements the eminently "rollable" 6922s and provides more than adequate gain. This combination of tubes enables the amplifier to get a beautiful big tone sound that has all the warmth and dimensionality that makes valves so unique, while providing a clarity and dynamic that is not often found in traditional valve amplifiers. To enhance control, Rethm decided on a solid state buffer in this amplifier. The amp's circuit is a zero feedback type, and the power stage is auto-bias.
After much experimenting with several valve types, Rethm settled on two single-ended configurations, or operating points, using the 6C33C valve. In the first of the SE circuit designs the integrated amplifier produces 5 wpc, and in the second, 15W.
The 5W version, the se5, aims at delivering a wispy and airy tonality typical of 2A3 and 300B tubes, but most notably with greater lower midrange / upper base body. This difference is attributable to the unique character of the 6C33C tube itself. It was conceived for loudspeakers with sensitivity ratings of 94dB and above. The se5 is custom order only.
The 15W version, the se15, aimed at delivering a slightly more dynamic and full-body-tone sound, often likened to a the tone level of an 845 or a GM-70 tube, albeit at 15W. It was conceived for loudspeakers with sensitivity ratings of 87dB and above.
All Rethm transformers (the output transformers, driver transformers, power transformer and choke) are cryogenically treated to achieve a substantial improvement in performance with greater transparency, detail retrieval and delicacy to the reproduction.
The integrated amp on offer is the "custom order" 5W se5 version, for loudspeakers with sensitivity ratings of 94dB and above.
ABOUT THE 6C33C TUBE
The 6C33C valve is, on technical spec's itself, an amazing valve
It has an extremely high Trans-conductance value -- in excess of 30 mA/V -- as compared to the 12.5 of a KT 120 -- which facilitates much better current flow. And, it has an amazingly low Internal Resistance -- 130 ohms -- as compared to 3000 ohms on a KT 120 -- which is almost comparable to solid-state devices! This enables a much higher speed of signal voltage transfer. It also has very low anode voltages ( as low as 120 v and up to design maximum of 300 v. This, as compared to most SE Class A tube power valves that go from about 375 v to in excess of 1000 v in the case of the 845 valve. This makes it a much safer device.
ABOUT THE POWER SUPPLY
The power tube B+ section of the power supply is SS rectified and capacitor-choke-capacitor (CLC) filtered. Total smoothing capacitance is very substantial at 5,170mF (11 x 470mF). Input and Gain stage tube heating uses a regulated DC circuit. The design incorporates a separate Gain Stage B+ SS-rectified supply with a substantial 2,350nF of smoothing capacitance. To enhance performance, It is housed in a separate chassis. All voltages are supplied to the output circuit chassis via 2 large high quality umbilical chords that use military grade pin screw-on connectors and receptacles -- one for the Preamp section and one for the Power section. The supply features soft start / delay.
INPUTS / OUTPUTS
The integrated amp offers 3 RCA inputs and a motorized volume control, controlled by a Remote Control. The speaker output impedance is 6 ohm.
Topology : Integrated Tube - SET CLASS A Power Output se5 : 5W @ 8 ohms Power Tube : NOS 6C33C Gain Stage Tube : NOS 6N6P Input Tube : 6922 / NOS 6N23P All Transformers CRYO-treated 2 - Chassis Design / Separate Power Supply chassis 3 Line Level inputs (RCA) Motorized Volume Control Remote Volume and Input Select Control
All service , if ever needed, done by authorized US-Based technical center in Norfolk MA.
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