The GM70 require dc filaments with any kind of loudspeakers due to the higher amplification factor and the trimmer are useless. Any amplifiers with dc filaments should use a separated …

2010年3月3日 · Thanks for your valuable and detailed info. Iam surprised how many GM70 amps are being manufactured. This GM70 looks a good tube for the price, in view of a 500dollars …

GM70 copper plate specifications: . filament voltage: 20V filament current: 3A . max plate voltage: 1.5kV long-dissipated anode power: 125W height 185mm, diameter 68mm - Plate resistance …

The GM70 and the 813 (FU-13) in a direct comparison with the 845 have the same sound quality but these tubes have the great advantage of a higher voltage gain to allow an simple driver …

The GM70 has been produced in the 1960/70's and 80's and there are only 2 versions , Carbon plate and Copper plates. So not much tube rolling possibilities but at least its NOS which …

2010年10月8日 · With an anode voltage 300-600V for GM70 and a driver will not get more classic than 12-15W sinus unlimited power. Actually, if you look at the triode curves for 6E5P; put a …

2019年3月27日 · The GM70 needs, as you know, a lot of volts on its grid. R. rufus74pz. Member. Joined 2010. 2019-03-28 4:44 pm #6 2019-03-28 4:44 pm #6 Hello. As for the voltage for G2 …

gm70单端输后级做好了，性能不错，这是用ef37a作前置放大，2a3b用输入牛推动gm70作单端输出的，gm70这管子线性很好，栅负压较深，介于211和845之间，比845容易推动，用牛交连 …

2016年11月13日 · 買了兩隻銅屏gm70剛拆封測試了一下燈絲 阻抗相差還算大 心裡開始毛毛了 覺得是不是管子有問題 一般805-845-211-gm70測試燈絲會在0.1歐姆以下居多 第一次測到這麼 …

Direct-heating triode GM70 Equipped with direct-heat triode GM70 tube with Pp=125W, which is larger than 845 (Pp=100W) and has low impedance. Output power is 30W + 30W (4Ω load) …