Mine didn't have the voltage multiplier circuit ! i seem to remember he said the ferrites for the bass unit were 10mh the rest was just a few components for the crossover on a piece of tag strip on the board along with the transformer it appears he tried different ways of wiring it up and yours is totally different to mine, possibly different transformers with different turns ratios , i got lost trying to follow the components to draw a circuit it just made no sense to me,
but looking at your diagram it is in the signal path, but I'm still not sure you would need a special transformer, i think he used line step up transformers which are quite cheap from Farnell or RS, a number of designs mentioned in the other threads use small toroids and have no problems with sound quality used on larger electrostatics, ( there's an Aussie guy who has a site where he sells much larger units and also posts on here and uses them he says he cannot hear the difference between the expensive specially wound audio transformers and the cheaper toroids)
what are the values of the components on the voltage multiplier ? as this looks like it would work on a larger home made unit which is what i have been thinking about, coupled to a bass treble unit, by larger i mean about 3 times the size of the small ones he sold,
do you have details of the crossover,
but looking at your diagram it is in the signal path, but I'm still not sure you would need a special transformer, i think he used line step up transformers which are quite cheap from Farnell or RS, a number of designs mentioned in the other threads use small toroids and have no problems with sound quality used on larger electrostatics, ( there's an Aussie guy who has a site where he sells much larger units and also posts on here and uses them he says he cannot hear the difference between the expensive specially wound audio transformers and the cheaper toroids)
what are the values of the components on the voltage multiplier ? as this looks like it would work on a larger home made unit which is what i have been thinking about, coupled to a bass treble unit, by larger i mean about 3 times the size of the small ones he sold,
do you have details of the crossover,
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Hi, Very deja vu regarding my experience, Richard Allen bass units though, rgds, sreten.
Hi,
My best guess, as I'm not sure, is that Dalesford, (a crappy knock off
name intended to be similar to Wharfedale), was a short lived endeavour
by Fane trying to get into the hifi market by making KEF style drive units.
The Dalesford tweeters were sourced from Isophon and Audax.
Something to do with Sugden as well, not sure about the connections.
Not related to Richard Allen or Wharfedale, couldn't compete with Audax.
rgds, sreten.
Used in some RAM speakers, and a short lived range of D shaped speakers.
My best guess, as I'm not sure, is that Dalesford, (a crappy knock off
name intended to be similar to Wharfedale), was a short lived endeavour
by Fane trying to get into the hifi market by making KEF style drive units.
The Dalesford tweeters were sourced from Isophon and Audax.
Something to do with Sugden as well, not sure about the connections.
Not related to Richard Allen or Wharfedale, couldn't compete with Audax.
rgds, sreten.
Used in some RAM speakers, and a short lived range of D shaped speakers.
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it was complicated in the late 60's and 70's as quite a few companies made drive units but not complete speakers, other mostly smaller speaker companies bought them and incorporated them in their own design of speaker,
Richard Allen made Dalesford, Dalesford was the name of the drive unit, at that time many if not most of the companies over here named their products Castle Speakers from Skipton used outsourced drivers early on, and i remember a speaker from them called the Kendal after a place in the Dales,
at that time a lot of small speaker companies started up and bought the units from other companies, Arcam Mission, etc, used drivers they bought in,
i still have two Arcam bass mid drive units with their name on but the tweeters were from Vifa, but they were modified to Arcams specs,
after or towards the late 70's RA were bought out possibly by Castle then Castle were bought out by Kef, lots of convoluted buying and selling going on then there were a lot of firms buying others out and incorporating the products into their own line,
one of the reasons for the names is that most of these small companies were located in west Yorkshire and around the area called the Dales, a lot of the senior staff left various companies to start their own when HI/FI was in it's boom years, engineers from Sugden and other companies,
Richard Allen made Dalesford, Dalesford was the name of the drive unit, at that time many if not most of the companies over here named their products Castle Speakers from Skipton used outsourced drivers early on, and i remember a speaker from them called the Kendal after a place in the Dales,
at that time a lot of small speaker companies started up and bought the units from other companies, Arcam Mission, etc, used drivers they bought in,
i still have two Arcam bass mid drive units with their name on but the tweeters were from Vifa, but they were modified to Arcams specs,
after or towards the late 70's RA were bought out possibly by Castle then Castle were bought out by Kef, lots of convoluted buying and selling going on then there were a lot of firms buying others out and incorporating the products into their own line,
one of the reasons for the names is that most of these small companies were located in west Yorkshire and around the area called the Dales, a lot of the senior staff left various companies to start their own when HI/FI was in it's boom years, engineers from Sugden and other companies,
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Well, I've got it here, but I need to work out the circuit BEFORE I've had a drink!
Actually, here are the pics, see if you can decipher it yourself; and let me know the circuit. I'm not just being lazy, following circuit diagrams gives me a headache.
The diodes are 1N4007, red caps are .01uF/300v, yellow cap .022/1500v, and the big green cap is 15uF, high pass for the audio out. Several components were removed over 20 years ago. The transformer is marked "Douglas"and is 65mm between the screws.
Actually, here are the pics, see if you can decipher it yourself; and let me know the circuit. I'm not just being lazy, following circuit diagrams gives me a headache.
The diodes are 1N4007, red caps are .01uF/300v, yellow cap .022/1500v, and the big green cap is 15uF, high pass for the audio out. Several components were removed over 20 years ago. The transformer is marked "Douglas"and is 65mm between the screws.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
John, I've managed to work it out, I think. Here's the circuit, and the original instruction leaflet. I will put a larger blocking cap on the audio input, as I will be using an active xover.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Oops, made a mistake with the circuit! Hopefully this one is correct. I would delete the first one, but I don't know how to.
An externally hosted image should be here but it was not working when we last tested it.
Hi Thanks, i've been busy and hadn't had time to really look at it, the transformer looks about the same as on those i had i do have a photo of all the parts and will try and post them when i have time,
my own ideas are a bit simpler than those your planning,
but this looks like it would be ideal for what i have in mind,
so once again thanks for the information and diagram,,
John s
my own ideas are a bit simpler than those your planning,
but this looks like it would be ideal for what i have in mind,
so once again thanks for the information and diagram,,
John s
I would be interested in any info/advice about replacement transformers. I believe they are 100:1 ratio, but not certain of that.
Many of the Dalesford drivers sold in the U.S. market were far different than the versions sold in the U.K. The specs were far different than the Kef drivers. One example are the Fried oem 10" that used a 135 mm diameter magnet and a extended pole piece.
Dennis Jaeger was the sole U.S. importer and distributed them to the vendors.
Dennis Jaeger was the sole U.S. importer and distributed them to the vendors.
For Sale 2x Shackman Dynastat MHT-85
I am the original poster of this thread and owner of the Shackman electrostatic units.
Moving home is forcing a clearout and the realisation that my DIY speaker days are sadly over.
So if anyone is interested the two drivers, plus two very tatty but working power supply/cross overs are up for sale if anyone is interested.
I am the original poster of this thread and owner of the Shackman electrostatic units.
Moving home is forcing a clearout and the realisation that my DIY speaker days are sadly over.
So if anyone is interested the two drivers, plus two very tatty but working power supply/cross overs are up for sale if anyone is interested.
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I lived in New Barnet, and I went into his shop/house once, on a Saturday lunchtime on my way back from a school orchestra rehearsal. Probably about 1979. Although I was a teenager, I had already spent a long time fixing and experimenting with numerous pieces of commercial and home made equipment. I had some understanding of what sounded good and why, and I had a good ear.
He put a violin concerto on the record player. I was amazed. It truly was a revelation. There was a violin player in the room with us.
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