{"type":"product","schema_version":"1.0","item_id":"101579652756","canonical_url":"https://tw.bid.yahoo.com/item/101579652756","title":"4真空管A類立體擴大機Homita AV-838(保證良品)","subtitle":null,"condition":"近全新","currency":"TWD","observed_at":"2026-05-03T05:25:57.926Z","current_price":3499,"original_price":null,"stock_status":"low_stock","available_quantity":1,"sold_quantity":0,"seller":{"id":"Y0120318352","name":"Y0120318352","positive_rate":null,"rating_count":null},"images":[{"url":"https://img.yec.tw/ob/image/a421c876-3a78-443b-b79e-155edeb44b27.jpg","role":"main","alt":"商品主圖","width":null,"height":null},{"url":"https://img.yec.tw/ob/image/00ff8e9f-6fa9-4abe-b1db-0d49a79b3e76.jpg","role":"detail","alt":"商品圖片 2","width":null,"height":null},{"url":"https://img.yec.tw/ob/image/678a5381-774d-4f28-a028-f46c97cb1de2.jpg","role":"detail","alt":"商品圖片 3","width":null,"height":null},{"url":"https://img.yec.tw/ob/image/11a13b07-319c-4e5f-955f-da068e033e26.jpg","role":"detail","alt":"商品圖片 4","width":null,"height":null},{"url":"https://img.yec.tw/ob/image/e33b5b1a-cacb-458b-aeda-9b7b917fbeec.jpg","role":"detail","alt":"商品圖片 5","width":null,"height":null},{"url":"https://img.yec.tw/ob/image/64cebf5c-e7b9-4491-9c21-8c31474ccfec.jpg","role":"detail","alt":"商品圖片 6","width":null,"height":null}],"description":"1.有人說:真空管擴大機的音質比較柔是因為真空管的前級會針對二次諧波放大，所以真空管的前級很重要。\n\n有人說:真空管擴大機的音質比較柔是因為真空管的輸出阻抗比較高，所以真空管的後級很重要。\n\n有人說:真空管推挽式擴大機的輸出變壓器因為兩邊電流相反，可以降低哼聲，但如果在某瞬間如果上下波都有信號，會因輸出變壓器電流方向相反會把該信號抵銷，有些聲音會消失掉。\n\n以上聽起來都滿有道理的，為了達到盡美的理想，理想的真空管擴大機應該是:前級與後級都是真空管，而且採用單端(A類)放大!\n\n2.本機器有CD、AUX兩組外接音源輸入，可外接音源輸出之影音器材，有高音、低音的調整。\n\n3.真空管使用外面很普遍的雙三極管：前級用6N1、6N2，後級用6P15、6BQ5作純A類放大，音質佳，維修容易而且價格不貴。\n\n4.輸出：實測每聲道”不失真輸出”約11V/8Ω=15W，只能接一組喇叭。\n\n6.試聽狀況：我音源用一般的DVD，喇叭用panasonic床頭音響的小喇叭測試，聽約翰史特勞斯的作品，砲聲結實，不會虛虛的，聽歌林公司出品的中國抒情音樂，那種輕輕柔柔的旋律，真是很不錯，感覺有些晶體擴大機中沒聽過的聲音都跑出來了!\n\n7.這是一台實用沒有多餘花俏的管機，音質比我預期的好，如果您還沒聽過管機，可以試試看，或許會跟我一樣驚奇，功能保證正常，若有功能問題一週內100%退款，讓您買的安心。\n\n8.原來的喇叭端子少了兩個塑膠套，我把喇叭端子升級為10A的高階端子，電路完全沒動!","shipping_methods":[{"name":"面交/自取/不寄送","fee":0,"currency":"TWD"},{"name":"宅配/貨運","fee":0,"currency":"TWD"}],"lowest_shipping_fee":null,"payment_methods":["ATM轉帳"],"category_id":"2092107940","category_name":"真空管擴大機","breadcrumb":[{"id":"2092101502","name":"家電與影音視聽","url":"/tw/%E5%AE%B6%E9%9B%BB%E8%88%87%E5%BD%B1%E9%9F%B3%E8%A6%96%E8%81%BD-2092101502-category.html"},{"id":"2092105885","name":"影音/視聽/MP3","url":"/tw/%E5%BD%B1%E9%9F%B3-%E8%A6%96%E8%81%BD-MP3-2092105885-category.html"},{"id":"2092075249","name":"擴大機","url":"/tw/%E6%93%B4%E5%A4%A7%E6%A9%9F-2092075249-category.html"},{"id":"2092107940","name":"真空管擴大機","url":"/tw/%E7%9C%9F%E7%A9%BA%E7%AE%A1%E6%93%B4%E5%A4%A7%E6%A9%9F-2092107940-category.html"}],"view_count":20,"watch_count":8}