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RE: Kit1 Anode Voltage

Posted by RhythMick (A) on October 8, 2007 at 13:19:59

In Reply to: RE: Kit1 Anode Voltage posted by RhythMick on October 5, 2007 at 02:51:37:

Hi all,

Just to let you know how this all got resolved.

1. The transformer was rewired from 230V to 240V - made a lot of difference.

2. 200R 18W dropper resister on the rectifier output, brought the 300B anode voltage down to 409V, with everything else still right. Sounded better again by a good margin.

3. Cathode resistor to 1K2 20W. now at 60mA and sounding fantastic, different amp. More relaxed, but at the same time more dynamic, muscular and just bigger. Less frenetic and tiring. Significantly more bass and bass control/extension. 300B anode voltage up to 430V but inside spec. 5687 anode voltage is now 402, but happy for now.

Great result all round and I highly recommend trying this. Longevity of 300B is a bonus. For interest, I used 5W Kiwame resistors (carbon film) in parallel for both the dropper and cathode resistors.

This post is made possible by the generous support of people like you and our sponsors:

WEET Music Caps

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