The majestic 2A3 directly-heated triode was introduced by RCA on the 10th of January 1933 without support rods, by 1934 with support rods. Sylvania Single Plate was 1935. By February 1936 RCA replaced the single-plate with two smaller 45-like triodes wired in parallel "W" filament - with perhaps not such good distortion characteristics but ...

2002年5月12日 · RCA早期弹簧吊丝红字版2A3：100分：解析力最强、频段最平衡，它的音质好到什么程度？ 听听你周围一切自然的声音吧，就是那种宽松自然的声音，不需要多加修饰。 RCA后期版本新2A3：95分：相比上面的弹簧吊丝版，给人音乐感更好的感觉，主要来源于它的低频较为突出，高频较为收敛，加上其它频段衔接匀有良好的表现，虽然它的低频有点突出，但不像SOVTEK 2A3那样模糊零散。 俄罗斯SOVTEK 2A3：70分：人声带有一股浓重的金属音染，颗 …

Get the best deals on Rca 2a3 when you shop the largest online selection at eBay.com. Free shipping on many items | Browse your favorite brands | affordable prices.

2011年7月31日 · 直热式三级功率电子管2a3最初由美国rca公司于1921年开始研制。 其型号历201、245、275等，直到1933年经过十余年的改进才定型为2A3。 2A3性能优越，内阻低，放大线性极佳。

2015年2月21日 · 2A3号称胆之原祖，因为性能优秀，自1932年RCA发布以来，历经80余年，至今仍有厂家生产。 其实2A3还有一个前辈，即45号电子管。 45的屏耗较小，输出功率只及2A3的一半，但据说它的声音比2A3还靓。 4P1S与2A3或者45本无渊源，可是将4P1S接成三极管之后，其参数却与2A3以及45有许多类似之处。 这三种管子的三个主要参数如表1所示。 从表1中可以看出，4P1S的跨导与2A3相当，而内阻却与45接近，由此导致的结果4P1S的放大系数为2A3的两 …

Get the best deals for rca 2a3 tube at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items!

购物上 eBay, 尽享 RCA 2a3 的超值优惠! 您可在 eBay 找到各式 RCA 2a3 商品, 不论全新或二手, 应有尽有. 为部分物品提供包邮. 全球最多的 RCA 2a3 商品及最优惠的价格, 任您选购. 在 eBay 安心购物!

Buy JAN-CRC RCA 2A3 vacuum power tubes online, in stock and ready to ship! Find reviews, data sheets and specs to upgrade your tube amplifier.

Two RCA 2A3 Power Tubes. Both Tubes Look Great and Test Great; The two tubes are testing as a match electrically, are similarly constructed but have some minor differences in the internals ; Both Have Dual S Style Black Plates; Both Have Spring Tops (rare top spring mounted filaments)

The 2A3 is a popular audio power triode that is still used in amplifier designs. Our stock are those with two triode assemblies within a common anode. Most of the tubes are military stock with dual dark grey plates from the 1950s in original boxes.