On Wed, 25 Aug 2004 20:01:59 +0300, Iain M Churches wrote:
Question: How much voltage does the tube rectifier drop, and how much
extra should I allow on the transformer secondary to compensate for this?

Depends on the tube.

Most data sheets for rectifier tubes have charts showing
expected DC voltage output for a given AC input and load.
You can go he
http://tdsl.duncanamps.com/tubesearch.php
and look 'em up.

--
Ned Carlson Triode Electronics Chicago,IL USA
www.triodeelectronics.com