Tube DIY Asylum

Posted by fourhooker (A) on October 08, 2005 at 13:33:39

In Reply to: Odd splitter in Radford amps posted by Ray Moth on October 7, 2005 at 08:23:20:

Hi Ray,

This circuit was described by A. R. Bailey in a three page article, entitled "New Phase-Splitter" appearing in the September 1962 issue of Wireless World. The author addresses the high-frequency roll-off displayed by the ECC83 in the conventional long-tail-pair phase-splitter (28db gain, but 2db down ~ 12khz). He achieves 24db gain with the ECF82 tube, but the high-frequency roll-off does not commence until 40khz, and does not fall 2db until after 100khz....

I am happy to respond to E-mail..

Graeme

• Re: Odd splitter in Radford amps - Ray Moth 19:50:40 10/08/05 (0)
  In Reply to: Re: Odd splitter in Radford amps posted by fourhooker on October 8, 2005 at 13:33:39:

  Thanks, Graeme, that makes sense, especially if the input stage to the splitter has a high OP impedance. The additional loading on the first stage of an ECC83 splitter's Miller capacitance could also cause distortion, I suppose. Still, I wonder how Radford achieved balance with such an unlikely arrangement and why no other designers ever used this idea?
  
  

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