Looking for documention about Quad current dumping

[forr]

Hi,
I am collecting documentation about the Quad 405 current damping technique. I already have a lot of it but some is still missing. The following references are coming from the J. Vanderkooy and S.P. Lipshitz's JAES article about "Feedforward correction in power amplifiers"

First and most important of all, I miss Peter Baxandall's letter in WW :
P.J Baxandall, Wireless World (Letters to the Editor), voll. 82, pp60-61 (1976 July).

Others are :

A.M Sandman, Wireless World (Letters to the Editor), vol. 82, pp 54 (1976 Apr.)
J.G. Bennett, Wireless World (Letters to the Editor), vol. 82, pp 55 (1976 Apr.)
J. Halliday, "Distorsionless Current Dumping" Wireless World (Letters to the Editor), vol.82, p.55 (1976 Apr)

B.G. Olsson, Wireless World (Letters to the Editor), vol. 82, pp 61-62 (1976 July)

T.C Stancliffe, Wireless World (Letters to the Editor), vol. 82, pp 52-53 (1976 Nov.)

D.T. Ovens, Wireless World (Letters to the Editor) vol. 83, p49 (1977 June)

D.M. Divan and V.V. Ghate Wireless World (Letters to the Editor), vol. 83, p 76 (1977 July)

T. Hevreng, "Distorsionless Current Dumping" Wireless World (Letters to the Editor) vol. 85, p71 (1979 May)
J. Vanderkooy and S.P. Lipshitz, reply to T. Hevreng, "Distorsionless Current Dumping" Wireless World (Letters to the Editor), vol. 85, p.71 (1979 May)


"Quadi-complementary complemented" , Elektor, iss. 21, p.39 (1977 Jan.).

Thanks in advance for any help.

[jez]

Yep me to... Anyone got the above articles?

[ricobasso]

Originally Posted by forr

First and most important of all, I miss Peter Baxandall's letter in WW :
P.J Baxandall, Wireless World (Letters to the Editor), voll. 82, pp60-61 (1976 July).

Yes I have the July 76 WW. I will scan it and print to pdf. Then what? Is there a way to upload to this site?

[jez]

you would need to compress the files to a small enough size for the site to accept them and then just use the attach function in the reply box. Not sure about any copyright issues but I guess it was a long time ago so should be ok.... or just send them to me via my email which you can find from the link to my website in my signature line.
Cheers, Jez.

[tiefbassuebertr]

Originally Posted by forr

Hi,
I am collecting documentation about the Quad 405 current damping technique. I already have a lot of it but some is still missing. The following references are coming from the J. Vanderkooy and S.P. Lipshitz's JAES article about "Feedforward correction in power amplifiers"

First and most important of all, I miss Peter Baxandall's letter in WW :
P.J Baxandall, Wireless World (Letters to the Editor), voll. 82, pp60-61 (1976 July).

Others are :

A.M Sandman, Wireless World (Letters to the Editor), vol. 82, pp 54 (1976 Apr.)
J.G. Bennett, Wireless World (Letters to the Editor), vol. 82, pp 55 (1976 Apr.)
J. Halliday, "Distorsionless Current Dumping" Wireless World (Letters to the Editor), vol.82, p.55 (1976 Apr)

B.G. Olsson, Wireless World (Letters to the Editor), vol. 82, pp 61-62 (1976 July)

T.C Stancliffe, Wireless World (Letters to the Editor), vol. 82, pp 52-53 (1976 Nov.)

D.T. Ovens, Wireless World (Letters to the Editor) vol. 83, p49 (1977 June)

D.M. Divan and V.V. Ghate Wireless World (Letters to the Editor), vol. 83, p 76 (1977 July)

T. Hevreng, "Distorsionless Current Dumping" Wireless World (Letters to the Editor) vol. 85, p71 (1979 May)
J. Vanderkooy and S.P. Lipshitz, reply to T. Hevreng, "Distorsionless Current Dumping" Wireless World (Letters to the Editor), vol. 85, p.71 (1979 May)


"Quadi-complementary complemented" , Elektor, iss. 21, p.39 (1977 Jan.).

Thanks in advance for any help.

I am also looking for this letter
BTW - by post 15 about
Ultimatest Passive Tone Control Network based on James-Baxandall's topology wanted
you will find interesting informations about this author.

In this case also this URLs are of interest:
Yamaha's Hyperbolic Conversion Amplification (HCA) Circuit
Collection of Class B topologies <100mA Idle and Sound closest by Class A
Edwin 20 watt (Elektor 1970 - May)
Dynamic Bias - Active Bias - Automatic/Self biased - Overview wanted

And an "Off-Topic" Question: Which documents/papers/articles are there concerning Yamaha's Hyperbolic Conversion Amplification (HCA) Circuit ??