The Tandberg TPA 3003 contains 5 different protection circuits. The main protection circuits are: Protection at speaker loads lower than 2 ohms, inclusive short-circuiting of speaker terminals, Speaker protection circuit, Protection of output and driver transistors against flashback from inductive speaker load. The mains transformer which is a toroidal type has very low height, high efficiency and very low stray magnetic field to prevent any radiation of hum or noise to other sensitive components or products. The rectifier used in the power supply will handle 25A. It utilizes a special cooling fin and is designed to stand extreme loads. The filter capacitors in the power supply are 2 x 15,000uF and the total power system is able to supply any current needed to the amplifiers even when handling high power transient signals. This unit is in good cosmetic and working condition. Show signs of previous usage such as hairline scratches, small dings, dis-colored & rust spots, worn-out corners and edges... Please consider listing photos as part of product descriptions. This unit has been serviced, tested and backed with 30-day money back guarantee. The listing is for one preamp unit and power cord only. No remote, No cable, No manual or any other accessories included. The internal electronics circuit is in good original condition. No sign of previous repair or modification. No return if due to buyer mishandling or damage because of lack of proper operational knowledge - and above all we are watching out for the part swappers if anti-tamper stickers on the unit removed or broke off. Serial number is recorded. If you happen to be a local buyer, you are more than welcome to contact us by eBay message to stop by and audition the item prior to buying. 10% discount will be applied toward the purchase price to local buyer. Operating on AC power of 115V and 230V 50/60Hz. Good for both US and international home AC outlets. Buyer with zero/no feedback please contact before buying. We reserve the right to cancel the sale to anyone. Will ship the 25 lbs unit in fully insured carrier (up to 35 lbs totally) with foam insulation and all corner reinforced. Buyer direct signature is required by both eBay and Carriers due to Buyer protection policy. No meet in person - No delivery. Flat rate $20 expedite shipping to anywhere to a residential address only. No P.O Box. Shipping carriers will be selected by Seller to ensure the best logistically and timely delivery to Buyers. _______________ Specifications Power output: 150 watts per channel into 8? (stereo) Frequency response: 20Hz to 20kHz Total harmonic distortion: 0.02% Damping factor: 200 Input sensitivity: 1V Signal to noise ratio: 98dB Dimensions: 435mm (17) x 350mm (14) x 83mm (3.2) Weight: 11.3kg (25lbs) Year: 1980