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LX521: introduction

When your cathometer indicates it is too warm for modeling there’s only one thing left to do: building your own speakers. HMS Hood had to wait for a few months.

I previously posted the progress on my Orion speakers and initially wanted to build a few more. I had collected the 20 amplifiers channels and five filters ready to hook up the remain three. One beautiful day in 2017 my Siamese cat Blair mistook my stack of amplifiers for a tree and decided claim it as its own by marking it. At first we heard a cackling sound from the speakers, followed by the amps bellowing large amounts of white smoke. Finally the mains shorted out. I tried cleaning them as best I could but only one out of three Rotel 1077s would come back to life.

I brought them to the repair shop and they concluded that one mainboard had certainly to be replaced and one separate channel as fried. After a brief (not really) period of financial mourning I abandoned the upgrade path.

Meanwhile the Orion were updated a few times and not all components were available anymore; the electronics I built could not be modified easily to get the last update. Also, a new design appeared for the same designer, replacing the Orion: the LX521. I decided to switch projects and continue.

LX521: introduction
LX521: deriving the digital filter
LX521: building the analog filter
LX521: building the power amp
LX521: building the speaker
LX521: results

Gallery: HMS Warspite

Bits of interbellum HMS Warspite after her major refit of 1934-1937, many Wright & Logan images that popped up on lamentable, wretched ebay.


After her refit; no pompoms or 4″ guns present yet.

March 1937

March 1937


July 1937

July 1937

July 1937

July 1937

Note the Walrus above the barrel of X-turret.

Now hear this

A few very large speaker are dotted around Hood;s superstructure (Tannoy system?). These speakers were added late in Hood’s career and do not show up in most photographs. The one at the breakwater is the most prominent but others were more difficult to spot. I managed to find one near the conning tower and one attached to the fwd bulkhead near the second funnel.  One pair appears to be fixed to the aft searchlight platform below the two upper searchlights? I could not find any on the quarterdeck region where one would expect at least one; I may add one as random detail to the aft bulkhead where the ship’s bell was mounted. A small selection of speakers was built using rod, an etched part, and finished using Magic Sculpt.

The launch of HMS Prince of Wales

HMS Prince of Wales was launched at Cammell Laird’s shipyard in Birkenhead on Merseyside  on the 3rd of May 1939. A number of photographs of the launching ceremony is being held by the Wirral Archives service; a number of these images show the keel laying ceremony as previously posted Laying the keel of HMS Prince of Wales.

A brief press clip can be viewed at British Pathe.I find this clip of particular interest as it mentions other nations not keeping to their treaty limits as well as the Royal Navy soon receiving three more ships of the same class Duke of York, Jellicoe and Beaty, (the latter renamed Anson and Howe), plus, the Lion-class battleships Lion and Temeraire. The keels of both of these ships would be laid a few months after HMS Prince of Wales was launched but work on both ships was suspended in 1940.

Please note these images have been reproduced with the permission of both BAE Systems and the Wirral Archives.

“Copyright © 2018 BAE Systems. All Rights Reserved. This work is reproduced with the kind permission of BAE Systems. BAE Systems is a registered trademark of BAE Systems plc”

I would like the express my gratitude to both the Wirral Archival Service and BAE systems both for their assistance and for making it possible to publish these photographs.

You can visit the Wirral Archival Service here:https://www.wirral.gov.uk/libraries-and-archives/wirral-archives-service


Note the many cameras in the background recording the launch.

Although some welding was applied in HMS Prince of Wale’s hull construction, most of it was still riveted. The overlapping hull plates were caulked and then a sealing compound called Aranbee was added to vertical raised plate edges (roughly perpendicular to the flow direction), between butt ends, and, in the bow and stern region—outside the region of the main armoured belt—to all raised plate edges in steamwise direction, giving the hull a smooth appearance

In the background the foremast and funnels of RMS Mauretania, launched a year earlier, are visible (not to be confused with RMS Mauretania from 1906).

The Princess Royal prior to her commissioning speech.













HMS Prince of Wales takes her place in Cammell Laird’s wet basin next to the RMS Mauretania.


A particularly striking view. Note that the side armour has not yet been fitted.

This collection contains only one well-known image of HMS Prince of Wales during her fitting-out. HMS King George V was the only of the class to have square scuttles at the Admiral’s dining and day cabin located in the stern. Although the scuttles here are clearly round, six rectangular cut-outs appear to be visible in the hull; the yard considered the square scuttles ‘incapable of watertightness‘. At right, next to the ladder, the storage rack for the night lifebuoy can be seen. This rack was removed before she sailed for her historic Atlantic Charter meeting.

Thrown in for good measure; the launch of HMS King George V. Note: the scuttles of the Admiral’s dining and day cabin are not yet present.

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