Goodbye decks…

Lack of DJ skillz and impending middle age forces sale! ;-(

There’s a story behind me and decks, which I can tell now that the 10 year non-disclosure agreement has expired. In my final year at university, I took the “Innovation For Engineers” class, which taught how to be an entrepreneur. Myself and another student, Andy Williams, decided that we would have a go at entrepreneurship for real. Andy knew I was a mad inventor, and he lent me money to develop one of my inventions, in exchange for half of the profits. (lesson 1 in entrepreneurship: never give anyone half of the profits)

The invention I chose was an improved crossfader for DJ mixers. I’d just fixed a DJ mixer for a friend, his crossfader had worn out, and I thought I could invent one that would last for ever. I soon had a prototype together, and we took it to music industry trade shows in Manchester and London to attract interest. The first interest we got was “Company G” who offered us £10k to bury the thing, a la everlasting lightbulb. (In hindsight we should have taken that.)

After a lot of board treading, we got the attention of “Company N” who agreed to buy the invention off us and fund the patent. Enter endless messing around with contract and patent lawyers. All went well until a substantive patent search found that I had reinvented a mechanism first patented by RCA in the 1970s. Game over! We walked away with £5k each, after a year’s work, for a net hourly rate comparable to flipping burgers. But it was certainly an interesting experience.

Company N launched the new fader anyway, in their Pro SM-3 mixer. Sales were so-so and the model was discontinued after a while, the company choosing to get out of analog mixers altogether and go to a digital solution.

Fast forward to 2 years ago, when I finally decided to buy some decks of my own. I bought a second-hand pair of Technics 1200s, only to discover to my surprise that I’m a crap DJ! I can match beats, but I can’t be bothered shopping for records, and have no idea what sort of records I’d want to buy anyway. And if I ever do buy any, I can’t remember the right places to mix them into each other.

The decks had their finest hour at my 30th birthday party, where I persuaded a friend of a friend to come and spin drum’n’bass on them. My flat was well and truly rinsin’! Unfortunately the rest of us got completely drunk, kicked him off the decks and started to play Blondie. He didn’t drink, and left in the huff. The party was still going at dawn the next day. Sorry, Chris.

Now I think it’s time to move on. Feel free to bid on my decks on Ebay! 🙂

decks for sale!

Transformerectomy!

No, it’s not some sort of futuristic android sex change.

I’ve lived happily with the Crown SXA for about a year now, and by and large, it’s been a pleasure. It sounds great, has more than enough power for me, and now winter is coming, I can warm my feet on it!

My main worry, though, was always the power transformers. Not only are they something like 50 years old, but they were never designed to handle 50Hz power, which is what we have in the UK. So, even with RG Keen’s Vintage Voltage adaptor installed inside the chassis, they hummed really loudly, got really hot, and gave off worrying smells.

My first port of call was Sowter Transformers, a custom winding company in Ipswich. I sent them the dimensions of the original trannies, and got the reply: “We don’t do metric sized transformers”. They were made in Indiana in 1960. How can they possibly be metric? But none of Sowter’s standard core sizes were even close.

So I thought, maybe “metric” just means “Not British”. A quick peek in the Hammond catalogue (sorry, catalog!) and sure enough, there were several transformers of the right size. I settled on the 290KX, which is Hammond’s replacement for the Marshall JCM900 guitar amp, and Bluebell Audio in Dundee supplied me with a pair.

After purchasing some end bells from TAD and some M4 threaded rod from “boltmeup”‘s Ebay store, it was time to pull the poor Crown apart!

dismantled!

This took most of the day. The new trannies had lugs sticking out of their bobbins, and needed some trimming to get them through the chassis holes. “It’s just like trimming a toenail”, as Philip from Bluebell told me, but much more expensive if you get it wrong!

New vs. old

After much fiddling, rewiring the rectifier to a bridge, wiring one of the transformers up backwards (thank goodness for the old light bulb limiter trick!) and pulling out the redundant Vintage Voltage unit, she was good to go!

done!

The bad news is, the new trannies still hum a bit. They’re quieter than the old ones, but not silent. They also still run fairly hot. The good news is, they don’t smell!

I finally painted the OPTs black to match