DescriptionCondition : USED Thank you for looking. [Product]-Technics SU-3400 integrated amplifier Vintage made in 1973-A very old and rare integrated amplifier. [Operation/Condition]-Confirmed that it turns on.-Confirmed that tuner, phono, TAPE, TAPE1, and TAPE2 music are connected to speakers.*No other operation checks have been made.*The power button light is not on, but it can be used without any problems. (See image) [Appearance/Condition]-It has been stored, so there are scratches and dirt.-It has been lightly wiped, but there is dust, rust, dirt, and small scratches that cannot be removed.-There is rust on the rear terminal.*Please check the image. [Contents]-Main unit only. [Specifications]-Made in Japan-Made in 1973-Type: Solid-state integrated amplifier-Circuit system: Fully complementary all-stage direct-connected OCL circuit-Rated voltage: AC100V-Rated frequency: 50/60Hz-Rated power consumption: 70W-External dimensions: 410(W)x140(H)x300(D)mm-Weight: 10.2kg This product is an authentic product sold in Japan. Please be assured that we package each item carefully without causing damage. Shipping We send a product with careful packing. After confirm your payment, Well ship this item within 5 business days. (except for Saturday, Sunday and national holiday in JAPAN) Weekends are not available because FedEx or DHL are closed. Returns We accept return items up to 60 days after the item has arrived. If you receive a defective product, please contact us. We will bear the return shipping costs. Please buy with confidence. About us Thank you for your seeing our page. Please feel free to question if there is an uncertain point on this page. We cordially answer it. International Buyers - Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying. Thank you for your understanding.

????PRODUCTS???? Please check the Photo Technics SU-3400 Stereo Integrated Amplifier (1973) – Fully Restored with New CapacitorsDescription This is a Technics SU-3400 Stereo Integrated Amplifier, a classic model from 1973, that has been meticulously restored and upgraded. All electrolytic capacitors have been replaced with high-quality, Japanese-made components, ensuring optimal performance. Exterior Condition:Excellent for its age, with no visible rust or major scratches.The front panel has minor blemishes, but overall, it is very well-preserved.The original top panel shows slight signs of use but retains its factory finish. Internal Condition:All circuit boards have been inspected, and solder points repaired.All electrolytic capacitors have been replaced with new, high-quality Japanese components.Block capacitors have been upgraded to audio-grade ELNA capacitors (8700?F, replacing the original 3300?F) for enhanced sound performance.Key Features & Restoration Details Speaker Terminals:The original speaker terminals are made of solid brass—a rare feature for amplifiers of this era. Protection Circuits:While the unit does not have a traditional speaker protection relay, it is equipped with an inrush current prevention circuit, located beneath the block capacitors.This prevents pop noise during power-on and ensures smooth operation. Improved Power Supply:The block capacitors were upgraded from 3300?F to 8700?F, significantly increasing power supply capacity.This upgrade eliminates distortion at higher volume levels and improves overall sound stability. Volume Control & Usage Notes:Due to the increased power supply capacity, the amplifier can now handle higher volume settings without distortion.However, users are advised to start from zero volume and keep the volume knob at or below the 12 oclock position to avoid stressing the circuits, as the original design was not intended for excessive output. Transistors & Heat Dissipation:The original metal-can transistors were inspected and found to be in excellent condition, so no replacements were necessary.All heat sinks were cleaned, and new thermal grease was applied to improve heat dissipation. Contact Cleaning:The bass volume control, which had significant static noise, was thoroughly cleaned and restored.Other controls and switches were cleaned using contact cleaner. Hand-Soldered Design:This amplifier features hand-soldered wiring, which ensures excellent build quality but made restoration more labor-intensive. For example, cleaning the bass volume control required disconnecting 20–30 wires.Important Notes for UseStart with the volume knob at zero when powering on.Avoid operating the amplifier at excessively high volume levels (above the 12 oclock position) to preserve its longevity.The amplifier produces a natural fade-out effect upon power-off, which is typical for models without a speaker relay.Why Choose This Amplifier? This SU-3400 represents a perfect balance of vintage charm and modern reliability. The restoration process emphasized preserving the original sound signature while upgrading critical components for enhanced performance and longevity. It is ideal for audiophiles and collectors who appreciate the craftsmanship and sound quality of classic Technics amplifiers. For detailed condition, please refer to the photos. ????PAYMENTS???? We accept PayPal and all major Debit / Credit Cards. We can only ship your item after your payment clears. We ship within 10 days of payment. ????CHECKOUT???? Please check your address before paying because we can ONLY ship to addresses that are entered before placing the order. We cannot change an address after the order has already been placed. ????SHIPPING???? Packages:Box and Bubblerup Packages usually leave our warehouse within 10 days of payment. Weekend orders will ship on Monday or Tuesday. We provide valid Tracking Numbers for all orders. ????International Packages:???? We ship to all US Territories, Europe and Asia and Middle East and Australia and Canada including Guam and Hawaii. All our international packages ship under the Fedex and Japan Post. ????CUSTOMER SERVICE???? If you have any questions or issues, we are at your service. You can email us anytime through eBay messages. ????RETURN INFORMATION???? We offer a standard FREE 30 days refund or exchange policy. Item must be returned in original condition in order to receive a full refund. ????Customs duty???? Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying. We will reply to your question or invoice within 3 days. We cant not reply gifts or unreasonable requests such as declared amount.

Thank you for coming over.DescriptionPlease be sure to confirm via message whether audio equipment or other electronic devices are in working condition or have not been tested.All our products are authentic and genuine.All items are shipped directly from Japan.Please feel secure in your purchase.This item is used.Please feel free to message us if you have any concerns.ShippingWe always send the item with a tracking number. So please place an order without any concern on delivery. You can always track the delivery status.Shipping is only available to the address registered in eBay. If you want us to send another address please change your address on eBay and then place an order.Shipping is available from Monday to Friday. Weekends are not available because freight (shipping) companies are closed.We do not mark merchandise values below value or mark items as “gifts” – Japan US and International government regulations prohibit such behavior.If your address is in the remote areas defined by the freight (shipping) company please pay the additional shipping fees with PayPal.We choose the shipping carrier—FedEx DHL or Japan Post—based on the item and at our discretion.About Importers ObligationImport duties taxes and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying. Thank you for your understanding.

Technics SU-3400 Integrated Amplifier - Rare 1973 Vintage Model Welcome to Tokyo Thrift Nook! Your destination for premium vintage audio gear from Japan! Discover more unique finds at Tokyo Thrift Nook! ???? Product Description Presenting the Technics SU-3400, a rare and highly sought-after integrated amplifier from 1973. This vintage model offers warm, authentic sound quality that is characteristic of Technics early audio engineering. With its classic design and durable build, the SU-3400 is a treasure for audiophiles and collectors alike. The unit has been tested for power and is in working condition. Given its age, this amplifier is a true vintage piece, adding both audio quality and a touch of history to any setup. ???? Key Features Model: Technics SU-3400 Type: Integrated Amplifier (Pre-Main Amp) Year of Manufacture: 1973 Condition: Tested for power; vintage condition with signs of age Sound Quality: Warm, classic Technics sound Design: Vintage aesthetic that adds a touch of history ???? Shipping Information We provide secure international shipping options to ensure safe delivery: Expedited Shipping: Shipped via FedEx or DHL for fast delivery. Standard Shipping: Japan Post EMS with delivery within approximately one week. Economy Shipping: Japan Post AirMail without tracking, arriving within 10-30 days. ???? Important Information Import duties, taxes, and charges are not included in the item price. These charges are the buyers responsibility, so please verify any additional costs with your local customs office. Ensure your shipping address is correct to avoid fees from address adjustments. If you encounter any issues upon receiving your item, please reach out to us—we’re here to assist! About Tokyo Thrift Nook Tokyo Thrift Nook specializes in offering a curated selection of high-quality vintage Japanese audio equipment to enthusiasts worldwide. Shop with confidence and explore our range of unique finds! Visit our store for more items! N:61

National Panasonic Stereo Integrated Amplifier SU-3400 Verstärker In diesem Top Zustand nur sehr selten zu finden funktionsfähig, optisch sehr guter Zustand, ohne nennenswerte Gebrauchsspuren SpecificationsPower output: 35 watts per channel into 8? (stereo)Frequency response: 5Hz to 100kHzTotal harmonic distortion: 0.2%Damping factor: 50Input sensitivity: 2mV (MM), 100mV (line)Signal to noise ratio: 73dB (MM), 85dB (line)Output: 100mV (line), 100mV (DIN), 1V (Pre out)Speaker load impedance: 4? to 16?Dimensions: 410 x 140 x 300mmWeight: 10.2kgYear: ca. 1971-1974

National Panasonic (Technics) Stereo Integrated Amplifier SU-3400 AmplifierThe description of this item has been automatically translated. If you have any questions, please feel free to contact us.National Panasonic Stereo Integrated Amplifier SU-3400 amplifierVery rarely found in this top conditionfunctional, visually very good condition, without any significant signs of wearSpecificationsPower output: 35 watts per channel into 8? (stereo)Frequency response: 5Hz to 100kHzTotal harmonic distortion: 0.2%Damping factor: 50Input sensitivity: 2mV (MM), 100mV (line)Signal to noise ratio: 73dB (MM), 85dB (line)Output: 100mV (line), 100mV ( din ), 1V (Pre out)Speaker load impedance: 4? to 16?Dimensions: 410 x 140 x 300mmWeight: 10.2kgYear: approx. 1971-1974National Panasonic Stereo Integrated Amplifier SU-3400 amplifier Very rarely found in this top condition functional, visually very good condition, without any significant signs of wear Specifications Power output: 35 watts per channel into 8? (stereo) Frequency response: 5Hz to 100kHz Total harmonic distortion: 0.2% Damping factor: 50 Input sensitivity: 2mV (MM), 100mV (line) Signal to noise ratio: 73dB (MM), 85dB (line) Output: 100mV (line), 100mV ( din ), 1V (Pre out) Speaker load impedance: 4? to 16? Dimensions: 410 x 140 x 300mm Weight: 10.2kg Year: approx. 1971-1974 Marke National Panasonic EAN Nicht zutreffend Produktart HiFi Verstärker Modell SU-3400

?Condition of the product and items to be checked We have performed simple maintenance such as replacing defective transistors and electrolytic capacitors, cleaning contacts of VR, SW, etc., adjusting bias, re-soldering necessary parts, and repainting the case, but we have not done a full restoration. The product has not been fully restored, and is being sold as junk due to the possibility of malfunctions and failures caused by deterioration of parts since it has been on the market for more than 40 years. The product is not guaranteed to have the characteristics, functions, and quality of a new product. This is a junk item, and we cannot respond to requests for compensation, refunds, or returns in the event of inoperability or other defects after purchase. We will not be able to provide compensation, refunds, or returns in the event of inoperability or other defects after purchase. Appearance. There are scratches, scuffs, and rust due to age, but there are no fatal damages or dents. Please check the pictures. Operation As observed by ear, a pop noise is generated when operating the turnover SW on the bus side for a few seconds after power-on, and also a buzzing noise is generated and subsides when operating the bus VR during this time. Other than that, no noticeable buzzing or noise is felt. Input Status] The following input terminals have been confirmed to produce sound by ear. We have confirmed operation at the AUX/TUNER/PHONO input terminals. Operation has been confirmed at the tape play input terminals. (Tape recording function has not been confirmed.) Tone control and balance knob are working. Output status Sound output from headphones and speakers is confirmed. Please check the condition of the item in the photos. Condition Level New - Unused - Excellent - Very Good - Good - Acceptable Condition: Good Payment We accept PayPal and all major debit and credit cards for payment. We will proceed with rush shipping arrangements after your payment. Checkout We can only ship to the address you entered before placing your order, so please check your address before paying. You cannot change your address after placing an order. Shipping Information Package: We will carefully pack your order in a box or envelope. We provide a valid tracking number for all orders. Shipping: All international packages will be shipped under Fedex or Japan Post or DHL. Return Information We offer a standard free 30 day refund or exchange policy. Items will be fully refunded only if returned in original condition. Customs Duties Import duties, taxes and fees are not included in the item price or shipping charges. These charges are the responsibility of the buyer. Please check with your countrys customs to determine what these additional costs are before bidding or purchasing. We will not respond to unreasonable requests for gifts or declared amounts.