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About VanArn

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  • Birthday 25/07/1941

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  1. The speaker will certainly require new surrounds to be fitted in the process of cleaning up the patchy repair work. The cone material is a carbon fibre blend and it may need to be treated with a dye to hide any remnant stains after removing the black adhesive. In most cases, neat repair work involves removing the cone assembly from the frame as the first step , then a clean up of old glue and surround material followed a by a check up of the working parts. Replacing parts as required, re-assembly and testing, complete the process.
  2. The cantilever assembly is held in place by latex strips at the top and bottom of the vertically set coil armature. These perish with age. The stylus material for this model would have been sapphire.
  3. The Ortofon pickup cartridge is the Type A and the green badge indicates it is intended for 78 RPM recordings. The numerals on the base plate is for the serial number and as it a moving coil , when a stylus became worn, repair was by way of a factory refurbished replacement from Denmark. Items in the past had to go through H .M.Customs and different rates applied to brand new and repaired goods. I am not familiar with that particular CE turntable and I suspect that the 15'' diameter would allow a cueing arrangement to be fitted to the platter to enable an instant start fo
  4. Tannoy only supplied replacement cone assemblies for their speakers. The vintage models are considered obsolete and the supply of new spare parts has been discontinued. You can source a generic voice coil ( ribbon wire ) from The Speaker Exchange in Florida but it is a component from a repair kit and you may have to delve through the listings to identify the individual parts. Remember to order two of everything you need as you need to closely match your speakers. It is precise work so I hope you have the required skills.
  5. Atilla Tanka or Garry Cawsey are the usual candidates for speaker repairs. Be warned the cost of the special Tannoy surrounds is on the high side and they should be coated with a special sealant coating when they are replaced. The corrugated cloth 'spiders' may also require attention.
  6. How long have you had the equipment ? If it only recently then there is the possibility of a induced beat frequency caused by mains coupling or a cabling hum loop. How close are the Bryston amplifiers to each other or any of the digital source equipment ? The inter connecting cables could also be suspect.
  7. I would suggest contacting Garry Cawsey or Attilla Tanka. From past experience, the cause of the midrange speaker going open circuit is caused by the lead out flat tinsel wire from the voice coil becoming fatigued. This is delicate repair work.
  8. Your choice is between obtaining secondhand Yamaha dome midrange units or having the originals repaired. I would suggest the latter course as there is always a risk with used items and they are usually not cheap to purchase. You may have to send the faulty speakers to Melbourne .
  9. What is shown is a power supply and a push pull modulator for an RF transmitter.
  10. The Glanz (it also appeared under the Astatic brand name) cartridge utilizes the moving flux principle patented by the manufacturer Mitachi. It corresponds to the moving magnet principle and does not require a step-up device.
  11. The JS 8060 transformer has a step up ratio of 20:1 and the matching impedances are 1.5 Ohm to 600 Ohm. I am assuming that Fidelity Research MC cartridge is a 10 Ohm model with a typical output level of 0.1 mV. The combination should enable a sufficient output level to drive a modern phono preamp. A standard input impedance of 47 kOhm will appear as an approx. 117 ohm load for the cartridge, so added resistors should not be needed. The only precaution is the low frequency response as the inductance of the transformer has to be considered. The Jorgen Schou step up transformer
  12. Replacement diaphragms are available from the USA, from sources such as Simply Speakers. .
  13. Start your build plan by obtaining the T & S parameters of the speaker by measurement or if you trust the manufacturer's specifications, use those. The enclosure internal volume and the Fb figures will then assist in determining the port diameter and a suitable length. A 10 cm diam. port is on the small side to match a 15'' woofer as it is approx. 1/10th of the cone area. The length of the port tube also needs some consideration. If it is too long it can cause unwanted pipe resonances and chuffing effects to be heard .
  14. Possibly Rage Audio in Sydney could be contacted, otherwise you may have to send your amplifier to Melbourne.
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