Several typos crept into Ian Hegglun's Vol 4 article "Towards a reconciliation of measurements with listening tests".

Some of these, notably fig 6 and fig 10, have been addressed in Ian's reply to Burkhard Vogel's letter.

The remainder are listed below:

1. page 39, Fig.5: CCIR-468 weighting filter circuit: L1 should read 12.88mH and C2 26.82nF and L2 in nH.

2. page 41 Figure 8. Filter banks for evaluating twin and triple A-weighting using the Total Difference method: change: R3 to {RL}

Also note that Ian's Power Amplifier Kalkulator spread sheet PAK 1.0-NM along with the User Guide and the LTspice circuits can be obtained by email from Ian at This e-mail address is being protected from spambots. You need JavaScript enabled to view it

 

Marcel van de Gevel's article in Vol 4 'A tube-based phono preamplifier' was concluded with a sidebar, starting on page 128, under the heading 'Phono amplifier with a +1 term'. Some of the time constant notations did not make it through the layout process unscathed. Here is the corrected section, with apologies to Mr. van de Gevel - ed.
 

 

In the article by Joachim Gerhard in Vol 0, "Down the Rabbit Hole - Adventures in the land of Phonostages", some text between pages 38 and 39 was left out through an error of mine. The missing passage, with text before and after, is available as page 38a here. With apologies to Joachim!

 

 
 

Ovidiu Popa's article in Vol 1, `On the Noise Peformance of Low Noise Input Stages` contains an error. On page 150, middle of the page, the sentence: "The current noise decreases with the degeneration decrease....` should read ´The current noise decreases with the degeneration increase...`