I am a former authorized dealer for many of the most revered brands and manufacturer's in our industry, and I am selling and liquidating my inventory and nearly everything I own and have collected to share our hobby and our passion and put some money in the bank for retirement
PRICE REDUCED AGAIN !
PRICE REDUCED FOR IMMEDIATE SALE
like new, flawless mint 10/10, anniversary edition, with all accessories and original wooden shipping crates and packaging. upgrade audiophile power cords and Sophia 300B vacuum tubes available additional cost or possibly negotiable and included with the sale. the CaryAudio SLP-05 vacuum tube preamplifier is also available(same 10/10 mint flawless condition)and may be included as a combo purchase or separate depending on the buyer and the combo price.
Behind the tubes, the main real-estate of the 805 is occupied by two very impressively sized transformers—one power, and one output, and four electrolytic capacitors. Also, toward the rear of the chassis are the aforementioned setscrew adjustment pot for biasing purposes and the quarter inch bias jack for reading the bias of the 300B driver tube. These are the only user adjustments you will have to worry about, other than choosing your output tube flavor.
The back panel offers a choice of 4, 8, or 16 ohm speaker outputs that are very high quality and heavy duty. There is a RCA input jack and a XLR input jack with a user selectable switch, and two visible fuses—one for the 300B and one for the output tube. There is also a built-in fuse within the AC power socket. The power cord is detachable.
To review the circuit, the single-ended audio input signal from the outside world is passed to the control input grid of the first 6SN7 tube. This first 6SN7 stage is operating in a parallel dual triode conventional resistance-coupled Class A amplifier. This first gain stage is directly coupled to the next 6SN7 dual triode gain stage. This second stage is operating in a series anode constant-current Class A amplifier. This amplified audio signal is passed through a coupling capacitor to the grid of the 300B driver stage. The 300B triode tube operates in a Class A single-ended mode utilizing fixed negative grid voltage on the 300B driver stage. This negative grid voltage is user-adjusted by the screwdriver pot at the rear of the CAD-805RS. The 300B is directly coupled to the grid of either a 211 or 845, 100-watt plate dissipation, triode output tube. The method of coupling at this stage is called an inter-stage transformer. This is an air-gap design with a flat frequency response from 30Hz to 23 KHz. The audio signal from the 300B inter-stage transformer will drive the 211/845 output tube to 27 watts Class A output. With additional volume levels, the amplifier goes into a positive grid mode with a power output of 50 watts Class A2. In the case of the 211-output tube, the Class A2 power is on the order of 70 watts at clipping. The high-power output from the 211/845 tube is coupled to the loudspeaker via an air-gapped 150 watt continuous duty output transformer. This transforms the high impedance (8000 ohm primary winding) of the output tube to 4,8, or 16 ohms to drive the loudspeaker.
211’s: 2x - GE , VT-4-C, SC7171A
300B’s: 2x - Cary Audio branded, sequentially numbered
6SN7’s: 4x - 1969 Sylvania 6SN7GTB (Black Plate), matched.
1629 ‘Cat Eye’ output level tube
Circuit type: Class A Single Ended triode
Rated power output: 50 watts RMS
Frequency response: 10-40 kHz +/- 1 dB
Bandwidth @ 1/2 rated power: 15-30 kHz +/- 1 dB
Rated input sensitivity: 1 volt
Input impedance: 150 k Ohms
Signal to Noise ratio, A weighted: > 85 dB below rated power
Noise and Hum: -80 dB below full output
Speaker terminals: 3 pairs of 5 way binding posts, gold plated for 4,8 or 16 Ohm loads
Power Transformer: 1 ea – EI Laminate, 200% Duty Cycle
Output Transformer: Air-gap, 200% Duty Cycle
Resistors: 1% Metal Film
Coupling Power Supply Capacitors: 4 ea – 1500µF @ 450 VDC
Feedback: 0 to 10 dB, continuously variable control
AC Power Requirements: 117/234 VAC @ 50/60 Hz
Power Consumption: 230 watts – Operation, 76 watts standby
Warm-Up Time : 5 Minutes
Chassis Size: 10" H x 12.25" W x 24" D
Shipping Weight, per amplifier chassis: 76 lb. and 10 lbs. for the tubes, power cords and bias meter- will ship in three boxes.
I prefer to use FedEx Ground but can ship by other carriers.
Single-Ended Pure Class A
50 Watts Pure Class A
0 to 10 dB, continuously variable control
20 Hz to 20 kHz +/- 0.5 dB at Full Power Output
230 watts – OPERATE, 76 watts – STANDBY
4, 8 and 16 ohm speaker connection terminals
Signal to Noise
> 80 dB below rated output
1.0 Volt @ zero feedback for full output
Power Supply Capacitors
4 – 1500 ��Fd @ 450V
1 – EI Laminated core power transformer
1 – Special air-gap output transformer
200% duty cycle on all transformers
2 – 6SN7 input tubes
1 – 300B driver tube
1 – 845 output tube or (Please choose 845 or 211 during install)
1 – 211 output tube (Please choose 211 or 845 during install)
5 minutes, after initial break in period
100 hours of music playing time
Jaguar ‘Anthracite Black’ chassis
10” H x 12-1/4” W x 24” D
also available are 2 matching Mapleshade amp platforms, available (1)as an option at a discounted price or (2)possibly included in the negotiation for the final price to the buyer.