New Arrivals in the Workshop

It’s been a busy few weeks and the following are just some of the latest amps in for restoration, repair and upgrades. A Radford STA25 is in for repair and upgrade and is having new main electrolytic caps fitted along with upgraded cathode bypass and coupling caps and new bias pots.

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I am doing a major restoration job on a Radford TT100. This is a very interesting solid state input /tube output hybrid producing 100watts a channel. A previous owner had made many mods, and left the amp in a dangerous state with 680v components held on with Blue Tack. There had a also been a major blow out on one channel which had taken out the driver transistors and bias pots on one channel. A further mod had been an attempted change to a choke input power supply but without changing the inductor. So the HT was around 100v down!

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A McIntosh MA 7000 came in for new main psu caps and rebiasing.

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Some Hashimoto step up transformers are in to be mounted in a decent case and wired up.

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A Mastersound Dueveinte is in for the addition of a tape out socket, and a few other upgrades.

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A Yaqin MC13 has been in for coupling capacitor upgrades.

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And again a few Audio Innovations S500 have been in for upgrades, repair and servicing. Finally, a Copland CTA401 has arrived for repairs and servicing.

 

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McIntosh MA7000

This amp had been leaking black gunge and the main power supply caps were the main suspects. A visual examination proved this to be the case, and new parts have been ordered from McIntosh to keep the original voicing.

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Radford TT100

Another really interesting amp has arrived needing a lot of tender loving care. The Radford TT100 is a hybrid solid state /valve amp. This one has been butchered over the years. While some components have been upgraded new components are held in place with Blue Tack, and others have been installed with no insulation so any movement or shock could potentially cause a major short circuit. Not the way I’d do any upgrades with 600v floating around inside! Thankfully all the transformers and chokes are in good order and having made the amplifier safe, it even made music on power up. Now for some restoration work to make this an everyday amp with decent sound quality and a lot of slam and dynamics!

 

 

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For Sale Troels Gravesen Illuminator 4

Your chance to own a unique pair of world class performing speakers. These were built by Troels Gravesen himself and were his personal speakers. Whilst they sound amazing they need a bigger room than I have to do them full justice so I am reluctantly letting them go. The woodwork is absolutely top quality as you would expect from Troels’ show speakers. I am including free delivery to anywhere in the UK or Northern Ireland. See the link below for images of these actual speakers and further details. The speakers use the top Scanspeak Illuminator drive units and sound as good or better than speakers costing £20,000 or more, giving true concert hall performance.Whilst nominally 89bd sensitive, they proved an easy drive for any different valve and solid states amplifiers. Click on this link to see Troels orginal description and photos of these actual speakers http://www.troelsgravesen.dk/Illuminator-4.htm

I am the first owner and have had these speakers 4 months. These speakers contain £4,000 of drivers and crossover components before you begin to count the hours involved in the exquisite workmanship of the cabinets.  £5,800 including delivery.frontsmall

Marantz CD 94-New Belts and Braces!

 

There are two common problems on the Marantz CD 94: the CD tray can often stop opening and closing, and the on /off switch breaking. The CD tray failing is normally down to worn drive belts or occasionally the commutator of the drive motor becoming clogged with grease.In this case, the motor checked out fine so the belts were replaced and all grease or scarf cleaned off the pulleys and other moving parts. Special plastic grease was then applied sparingly to the moving parts. However, the new belts did not cure the problem despite all parts moving freely as the small pulley wheel on the tray closure mechanism was still slipping. The solution was to add an extra drive belt to operate the tray closure solenoid. perhaps the pulley had become poised over the years, but two drive belts is now giving perfect, reliable operation.

The on /off switch fails because the plastic operating arm is very flimsy, despite the battleship build of everything else. So I re-fashioned a new end of the operating arm from epoxy and the on /off switch is now working reliably again.