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My favourite USB battery power Pack

This is the excellent USB power pack I use when I travel.

2 x 2.1amp outputs. 8400mAh capacity.

Two digit Led display shows battery level

 

What SD CARD should I buy?

If you want an SD Card for your camera - these are the ones I use and recommend. 

I'd strongly recommend not to buy any SD cards off ebay - I've heard about too many issues with counterfeit cards - often sold on by unwitting resellers. My inbox regularly gets messages from people who bought a £150 camera then cheaped out and bought a £3 memory card on ebay - Then when it doesn't worth they blame the camera! It doesn't make any sense. Good memory is cheaper than it's ever been - see the links above.

A lot of HD cameras will not work properly with cards larger than 32GB (cards over 32GB are usually SDXC rather than the SDHC standard used by 32GB cards. SDXC cards use the ex-FAT system rather than FAT32 - in short they are a different standard). - so don't just buy the biggest card you can afford - read the specs in the manual to see what it accepts.

UK & US LINKS & PRICES BELOW

RECOMMENDED CARDS (for action cams - see dashcams below)

CLASS 10 UHS-1 CARDS (For HD Cameras)

 

U3 CARD (For 4K cameras)

 

 

SPECIAL DASHCAM CARDS

The SD card in a dashcam is re-written over, more frequently than in other types of cameras. Some manufacturers void their guarantee if an SD card was used in a dashcam. So, no surprise, there are special High Endurance SD cards made just for dashcams...here's some.

 

VERY IMPORTANT. These links take you to the product, however Amazon have three different ways of selling. There's Amazon Direct - This means that you are only dealing with Amazon themselves, then there's other sellers that use Amazon's facilities - these show as Fulfilled By Amazon and finally there's Market Place sellers that advertise on Amazon, but operate independently.  I strongly recommend that you only use the first...the Amazon Direct - Sold By Amazon option. Even if it appears that you are paying a couple of £/$ more it is more than likely you are comparing the price of a real item against the price of a fake.

To give you an idea of the extent of the fake goods problem. In a 2016 survey by Apple - 90% of the 'Apple' chargers sold through Amazon - using the other the two methods..which includes the "Fulfilled by Amazon" option -  were found to be counterfeit....90%! 

 
« The Laserdock - The laser show for your home | Main | My fave £99 action camera from 2013 is now £23 - is it still worth it? »
Thursday
Sep222016

RCA Cartridge: The fail that shaped the future

In this video I'm looking at another forgotten format. This one is the RCA Victor Tape Cartridge, also known as the Sound Tape Cartridge and the Snap Load Cartridge.

I'll try to find out what RCA got right and wrong, attempt to repair a machine and finally demonstrate this 1950's cartridge system that introduced a number of new ideas which went on to become standards.

After you've watched the main video, you may want to listen to the Bel Canto demo tape in full - so that can be heard here.

You can also watch the 1958 RCA Cartridge introduction film which also contains an introduction to stereo which explains how a record can hold two tracks read by one stylus. 

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Reader Comments (9)

Actually I'd say that the tubes may be bad. Also since it was a basic recorder, it might actualy just be so bad. The "secret" to high quality amplification is the feedback principle. Essentially you compare the output of the amplifier to the input and regulate out any imperfections.

Actually "carts" were used well in the 2000s by some poorer radio stations in the US.

September 22, 2016 | Unregistered CommenterChristian Berger

I unsuccessfully attempted to source replacement tubes. However I've done what I wanted to do with this format now...I've moved on to my next project.

September 22, 2016 | Registered CommenterTechmoan

i bet the 1960's Walkman was a rather large contraption :@)

September 23, 2016 | Unregistered Commenterpaul

I wonder who those voices are on the demo tape - the woman sounds a lot like Dottie Evans, best known from her collaborations with Tom Evans on the Singing Science Records, although I suspect that was just because people in the era all tried to have a particular sound when they spoke.

September 24, 2016 | Unregistered Commenterfluffy

Mat regarding perished belts, you can get “polyurethane drive belts”, in various diameters off eBay. Cut to the length required then simply melt both ends with a hot knife and join quickly. Finish by cutting off any excess.

September 25, 2016 | Unregistered CommenterEW

I bought some of those...but they aren't stretchy enough to move into rewind mode.

September 25, 2016 | Registered CommenterTechmoan

I find so interesting all your videos (please excuse me for my bad english). CONGRATULATIONS!! Greetings from México!!

September 29, 2016 | Unregistered CommenterAndy Solares

TM, I own a ~100 year old Edison Diamond Disc player. I hadn't even heard of the format until my 80 year old neighbor was about to move and offered it to me. They stopped producing them just before the crash of Oct 1921. Right up your alley given that it uses VERTICAL grooves and (still to this day) produces impressive sound. Hope to see a post soon!

September 30, 2016 | Unregistered CommenterRandall J

I heard about these many years ago but other than a couple of pictures of the cartridges in reference books had never actualy seen one or the machines that played them. Great video!

March 29, 2017 | Unregistered CommenterSebastian Sekinger

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