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  #76  
Old 14-10-11, 11:29 AM
paskinn paskinn is offline
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The cost is very high...but John is not doing this to make money, and frankly, he won't. The amount of preparation work was great....not least because the original plans are not accurate, by which I mean that if you follow them carefully, the speaker won't fit! Les had to dismantle another Voigt and use that as a model, along with the plans. Even then there were a series of changes over the years. The reflector took two weeks to build-up, because of the drying time of plaster of paris. You add up the wages, the materials, then factor in the cost of deming at Whittlebury, loads of leaflets, the charges any dealer or distributor will make...well, it is quite startling.Especially as they could only be produced in tiny numbers.
This was never about making money. As for the field coils, the Voxativ field coils are a fair upgrade on refurbished Voigts (fitted with new Lowther cones and rewound for 12 volts). Better frequency response and a compete absense of the lowther 'shout '(which the Voigt cabinet seems to minimise anyway.) If anyone lives near the South East coast, and wants to hear original voigts fitted with Voxativ field coils, contact me. BTW, power supplies seem to be very critical. A battery seems the best bet for energising the coils...any noise on the line and you hear it.Fussy stuff.
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  #77  
Old 15-10-11, 07:31 AM
eguth eguth is offline
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VOIGT ON TRANSIENT RESPONSE

Voigt Letter: Wireless World, 15 October 1939, p.390-392

This is a long and masterly letter entitled ‘TRANSIENT RESPONSE’. It emphases, inter alia, the importance of phase and the (ideal) infinitely rigid, weightless material of the loud speaker designer’s dream. The letter contains a useful summary at the end. Point #8 states:

“…in the absence of the phase/frequency curve (or equivalent) the response curve does not tell the whole story….”

There is a great deal more in this letter. I cannot imagine how I missed it. Many thanks to Barniboy for adding it.
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  #78  
Old 15-10-11, 09:17 AM
bottleneck bottleneck is offline
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Quote:
Originally Posted by paskinn View Post
The cost is very high...but John is not doing this to make money, and frankly, he won't.
He won't make a lot of money?

How many pairs of speakers at twenty eight thousand pounds do you think he'd have to sell before he DOES make a lot of money?

What do you call a lot of money?
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  #79  
Old 15-10-11, 01:51 PM
paskinn paskinn is offline
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Quote:
Originally Posted by bottleneck View Post
He won't make a lot of money?

How many pairs of speakers at twenty eight thousand pounds do you think he'd have to sell before he DOES make a lot of money?

What do you call a lot of money?
You obviously don't know John Howse.....he has run a Lowther/Voigt museum, at his own expense, for many many years.During that time he has given many hours of free advice to many many enthusiasts. Without him the whole Lowther/ thing would probably have disappeared. Certainly, he has been busy collecting cabinets to save them from the scrapheap. He has never sought to make any money . He won't make any money now....you try building a pair and marketing them. But somehow I rather suspect you prefer to criticise, not contribute. .
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  #80  
Old 16-04-12, 04:28 AM
eguth eguth is offline
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ADDITIONAL MATERIAL

I have taken photos of Dulwich College, Voigt’s old public school.

I have posted historical glass slide images of the Pender Electrical Engineering laboratory where Voigt carried out his studies at UCL.

These images are now on p.1 of this thread.

Acknowledgement for the historical images is given in the Acknowledgement section.
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  #81  
Old 23-04-12, 02:59 PM
Barniboy Barniboy is offline
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A Voigt Domestic Horn refurbishing project

Encouraged by Eguth, I have prepared this photoseries of my project of restoring a set of Voigt corner horns. Perhaps this will be useful for showing a little about how these horns were built and looked like.
You will see S/N 44 of 1936, first sold to the BBC and S/N 157 of 1938, first sold to a Mr. Bendelow, according to a copy of the original books.
They are remarkably similar in build and material.
Perhaps this would be a good time to explain about the scale of Mr. P.G.A.H. Voigts production: Eguth has already detailed a biography and the production of various text, patents and advertising, but of course production of goods was the crankshaft of it all.
Mr. Voigts books shows the following remarkable figures for production of Domestic horns alone: 1934 / 5 pcs., 1935 / 46 pcs., 1936 / 61 pcs., 1937 / 72 pcs., 1938 / 75 pcs., 1939 / 47 pcs., 1940 / 12 pcs., 1941-46 / 0 pcs., 1947 / 12 pcs., 1948 / 12 pcs., 1949 / 12 pcs., 1950 / 6 pcs.
Considering the size and the complexity of the Domestic horn, and also considering that each horn was delivered with a massive 14 kg speaker unit (see my photosession of the Voigt Light coil twin), it is clear that Voigt Patents made a remarkable achievement for its time. Imagine selling more than 1 of these horns pr week, during the peak years, even today !
Now add to this all the other items also sold by Voigt at the time, e.g. 2- and 4 ft. straight horns for cinema use, outdoor versions etc.
Sales too, was made entirely by Voigt himself, assisted by a Mr. Redgrave, not wasting money on expensive exhibitions, but thru homeparties very similar to "Tupperware's" today, driving cross-country, carrying a 6-foot, 75 kg. speaker in and out of peoples homes !
Lowther sold 43 pcs. (during the coorporation, before the "merger"), BBC bought 4 pcs., Baird bought 12 pcs.
It seems Mr. Voigt signed S/N 28 out for himself !
Have fun. (Double-click at 1. "Stripping", then click "next")

http://www.flickr.com/photos/65583803@N03/sets/
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  #82  
Old 23-04-12, 03:24 PM
Tony L Tony L is offline
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Very nice job!
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  #83  
Old 24-04-12, 05:21 AM
eguth eguth is offline
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ADDITIONAL MATERIAL

I have taken a photo of a house in Church Rd., Upper Norwood, next to the one where Voigt lived from about 1929 (see page 2).
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  #84  
Old 14-06-12, 04:04 AM
eguth eguth is offline
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ADDITIONAL MATERIAL

I now have an apparently previously unpublished photograph of Voigt. I have posted this on page 1. I have commented on its provenence below the photo.

Last edited by eguth; 14-06-12 at 04:49 AM.
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  #85  
Old 13-09-12, 04:05 AM
eguth eguth is offline
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ADDITIONAL MATERIAL

UCL has unearthed records of Voigt's studies during 1921-2. And also a memo relating to his bequest. I have added these to the thread on p.1.
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  #86  
Old 05-11-12, 03:15 AM
eguth eguth is offline
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ADDITIONAL MATERIAL

I have posted a photograph of Paul and Ida Voigt. This was taken in 1953 a few years after the Voigts arrived in Canada.

You will be able to see the photo on page 2 of this thread in Section IX 'Canada'.
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  #87  
Old 07-12-12, 04:54 AM
eguth eguth is offline
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INTERVIEW WITH BABARA VOIGT

This has now been posted on Page 2.
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  #88  
Old 12-03-13, 04:36 AM
eguth eguth is offline
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Canadian photographs

Two photos of life in Canada have now been posted on page 2. These are: 1) a 50th anniversary, and 2) Paul & Ida with their great nephews
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  #89  
Old 14-04-13, 07:31 AM
paskinn paskinn is offline
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After the Howes Memorial speakers were completed and, briefly, exhibited, the whole 'campaign' seemed to run out of steam. But there should be as much info as possible about these remarkable beasts. I've owned a pair; marvellous.
So myself, Peter Skinner,and Les Bartlett (who built the first pair, after having spent many many hours untangling the complexities of the bass cabinet) set about making a second pair. There were minor, but important, ommissions from the bass section of the 'memorial ' pair..cleverly spotted by the eagle-eyed and technically adept David Watson. These missing bits were not on the Voigt plans but were inside actual original cabinets (we have checked six cabinets from 1934 to 1955 ). So the new pair have put that right, and also tightened up on the general precision of the diffusor and reflector (Both taken from originals). We checked accuracy by using a dismantled (very woodwormy) original cabinet, taking well over 100 photos and many more measurements. We also used crucial parts from the original as jigs to ensure accuracy.
The aim is quite simple...to increase public knowledge of the Voigt. We don't want any 'secrets'..everything we have learnt we will share, and ideally, this will help other people build accurate, good, replicas. Although it is not easy. Les Bartlett is a professional cabinet maker, but it has still taken him somewhere around 250 hours to build this second pair....partly because we were so keen to ensure accuracy by learning directly from an original Voigt rather than second-hand info or incomplete plans. The next step is to create a website where we will post all the photos, precise dimensions of the reflector, details of how to make a diffusor and lots of other stuff. The idea is that everything we know will be in the public domain. It's a labour of love..these Voigts are not for sale....but we hope it will help. If I can afford it, I hope to get a professional draughtsman to draw up usuable plans. They are a complex and difficult project.
Anyway, the website should be up by the summer, masses of photos, and plenty of dimensions. My dream is that some other people will be able to make first rate pairs and the Voigt will get a second life ; accidents of history (such as a World War) got in the way of Voigt's great achievement. Maybe a lot of work and the internet can now help.
BTW: I don't know how to post pics on pfm: butg if someone is willing to help add them to this post, , send me your E mail address and I will post you some key pictures, which I think are probably unique in showing details of the construction. I hope it all serves Voigt's memory and adds to the superb academic research shown on this thread. I think we all share a common purpose.
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  #90  
Old 15-04-13, 03:00 AM
eguth eguth is offline
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paskinn

This sounds as if it would be good to hear more of.

I am puzzled why you want to put further info on a new website rather than contribute to this thread instead.

I am not very computerate, and had to consult Tony L in order to learn how to post my first photos on pfm. pfm does not host images. You need to sign up, first, with some online host. There are, I gather, a number of these.

The host I use is called 'flickr'. It is not difficult to use it, though it may take some time before you become very profficient.

flickr, which is free of charge, enables you to put your images direct on a pfm post, without having to use a link.

More generally, my concern is about proliferation of sources for information and materials. Anyone who has carefully read this thread will have become aware that there are a number of archives that have some material about Voigt. I have not found any of these to be comprehensive. With a view to rectifying this I attempted to persuade the Briitish Library to start a new Voigt archive to which I envisaged new material would be contributed, including rare originals. The library declined to do this, citing lack of funds.

I would encourage you to join flickr (or some other host) and continue with your plans to post more information and pictures on this thread.

Regards,

eguth

Last edited by eguth; 15-04-13 at 04:19 AM.
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