EAR 834P Impedance?


Hi everyone, Happy Thanksgiving Day!

What impedance does an MC see when I use the MC input on my EAR 834P? It uses tranformers in that setting, so is it something other than 47K? Does anyone know of a way to change the loading?

Thanks
frogman

Showing 2 responses by palmnell

It's 515 ohms in the MC position......

.......a decision made by the designer in order to tame high frequency resonances in MC carts. Unfortunately I discovered it really compromises the performance of the Koetsu and Linn cartridges that I use.

I mainly use a Koetsu Black, which like all the Koetsus performs best seeing 10 ohms. The transformer boosts the signal by 10 and decreases the impedence by the same ratio, so I installed high quality 100 ohm Rikken resistors. The result compared to the stock resistors producing 515 ohms was a much tighter bass, a less recessed midrange and a much smoother and melodic top end.

Unfortunately this isn't something you can change with the flick of a switch. I had to unsolder the existing resistors and replace them. At the same time I replaced six of the stock capacitors with massive Hovland Musicaps.

The design of the EAR has so much potential, but it's built to a price point. You can make it a cost-no-object design and unleash the true potential of this phonostage by replacing the stock components with high-quality alternatives.

You can go as far as your wallet will allow. You can replace every resistor and capacitor in the EAR virtually creating a new phonostage with the same schematic. Do a search on this website and Audio Asylum to see what Thorsten, a British user has done to his 834P. It bears little resemblance to the original.

But even my small mods have increased the performance radically. I have also replaced the stock Russian tubes with
vintage Telefunken tubes. A huge improvement right there.

So if you are handy with a soldering iron do your own mods. If not, do as the previous poster suggested and contact Mitch at EAR USA. He will happily hot rod your EAR at a reasonable price.

Have fun,

Mark

Hi Frogman,

What cartridge are you using ?

When I was loading the Koetsu at 515 ohms the sound was downright boring. I experimented with 250 ohms, 200 ohms, 150 ohms, 100 ohms. 50 ohms and finally 10 ohms. Each change brought an audible improvement. At 10 ohms everything just gelled. You may be surprised at how a small change in loading can make your cartridge sound a lot better.

All the best,

Mark