Description
????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.
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