For sale: a beautiful Conrad Johnson LP70S tube power amp with Teflon CJD coupling capacitors; 70 watts/channel. $3250 obo, (list $7500).The amp is in excellent functional and cosmetic shape. Factory supplied tubes are in like new condition. I however am rating it as in "Very Good Condition" due to me being the second owner, otherwise this is in "Excellent Condition". This amp has only been used in a smoke/pet/child free home. The LP70S is a very open transparent and smooth sounding amp. This amp combined with CJ's Premier 16 preamp is the best sounding system I have had yet; now due to a speaker change I am going in a different direction. Prior to this amp I had owned the CJ LP66s tube amp and I can honestly say this was a substantial upgrade in overall performance. The dynamics, speed and mid-range were night and day difference in my opinion. Shipping and Paypal is buyers responsibility. The amp is packed in the original box plus I have double boxed it to ensure safe shipping. Tubes have been removed and separately bubble wrapped. Shipping weight: 62 lbs. Upon request I have additional pictures to show amp without tube cages, packing of amp etc. Please also note, the one picture of the top that shows a couple white dashes toward the rear is actually the sun coming through the window blinds. If you have any other questions please ask. Product Information
This conrad-johnson linearized-pentode amplifier is designed to meet the needs of industry professionals and audiophiles who seek audio perfection for their reference systems. All LP amplifiers share the same basic audio circuit. This circuit consists of three stages. The input signal is amplified by a triode amplifier. The signal is then direct coupled to a cathode coupled phase-inverter. This high current, triode phase-inverter stage provides a balanced, low impedance drive to the output stage. Output power is developed by 6550 output tubes, chosen for their musical accuracy, high power, and reliability. Each channel of the LP70S uses one pair of 6550s to produce 70 watts per channel. The output tubes are operated in ultralinear configuration which offers an optimal combination of high power and low distortion. The massive conrad-johnson transpectral output transformers have intricately interleaved wind-ings designed for extended bandpass and high phase linearity. A small amount (about 12 dB) of loop negative feedback reduces distortion and achieves a sufficiently high damping factor to control reactive loudspeaker systems. Separate, low impedance, discrete dc power supply regulators are provided for the input and phase-inverter stages, preventing the output stage from modulating these stages through the power supply. These power supplies are designed to maintain a rock solid supply at all audio frequencies. The main power supply reservoir uses a bank of massive custom polypropylene capacitors. No electrolytic capacitors are used in any of these power supplies. These amplifiers require no complicated adjustments or specialized equipment to maintain. To assure continued peak performance, the owner need only make a simple bias adjustment when new tubes are installed. Built in LED bias indicators allow the user to easily make this adjustment.
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