2014年3月12日 · During the search of proper tube for building RIAA, I came across a site introducing a triode-pentode tube called 6F12P (6Ф12П) which has very high mu and high Gm for each section.

2019年4月20日 · The 6F12P is used (by many) in Europe (mainly) in RIAA circuit. You would wonder why? Well, it’s a great Russian frame-pentode which has high-mu and high-gm therefore driving larger currents at low distortion.

2016年9月26日 · Here is an RIAA phono stage I designed. If you're not familiar with them the 6F12P is a high mu triode/pentode. The triode has a mu of 100 with 19.5ma/V. When triode strapped, the pentode is similar. I use the triode connected pentode as an active load, with a split RIAA network. The 6N5P is very close to a 6SN7 at this bias point.

2017年3月9日 · 唱放是去年的，只是还未有时间分享，最近整理文件便一起分享，并希望能从中得到高手指点一二。 第一级选用6F12P模感（Gyrator）原因为：1、用尽u，2、合适的宽 ... 我的LCR唱放 ,矿石收音机论坛

2016年6月13日 · 6F12P唱放实测为58.8DB，基本可以满足大部分MC唱头。 电源还是用6F12P作前、反馈双重并联稳压！ 失真0.015%（LPF30K） RIAA与模拟仿真出人不大！ 完成的相片. 本帖最后由 lirongxiang 于 2016-6-13 19:21 编辑 最近玩Gyrator的电路，觉得很不错，于是就顺道做个唱放了！ 唱放电路用 12AX7、12AU7 的低 gm 管子，噪音很难符合现今的要求，所谓靓的品牌价格己经很贵！ 因此今次就用个冷门管6F12P吧！ 且6F12P 三极部份的 Pa（屏耗）可达 …

2014年3月12日 · I had simulate the circuit on TINA-TI, it seemed no major problem on bass. (well it did have some minor deviation from enhanced-RIAA curve within 0.5dB) But when I tested on osc scope, the response rolled off at around 180Hz@-3dB / 50Hz@-6dB.

Tube 6Ф12П or Röhre 6Ф12П ID20601, Triode-Pentode, Noval, 9 pin miniature (USA pico-9) B9A and shown. Radio tubes are valves.

2019年4月20日 · The 6F12P is used (by many) in Europe (mainly) in RIAA circuit. You would wonder why? Well, it’s a great Russian frame-pentode which has high-mu and high-gm therefore driving larger currents at low distortion. Continue reading

6F12P - Tubebbs ... 6F12P

This one uses 6F12P for gain and phase splitting duty, and 6P43P in triode connection. It also uses toroidal power transformers as OPTs like all of my other designs...