How important is ext. adj. for cartridge loading


Hello Folks,

A New Phono Preamplifier will soon be introduced - MSRP around $1750 - $2000

A small "focus group" questionnaire - On a Phono Preamplifier how important is it to you that MC cartridge loading is adjustable from the front panel of the amplifier? How often do you "fiddle" around with loading ? Enough to warrant the cost increase, probably about $200 for the additional switches faceplate machining etc. pricing the preamp towards the higher end of projected price?

Same goes for MM/MC switching Would external selection be preferable to a internal Jumper setting ?

Is a MUTE function desirable on the front panel as well?

MC loading is at 100, 220, 330, 500 Ohms and 47K Ohms, do you think these are OK or would you like other values?

We have designed the unit so it can be used as a fully differential unit as well with one balanced input and one balanced output, you'd need two of them for stereo, do you find this desirable? Would you prefer this mode of operation to be selectable from the outside (switch on back) or would internal jumper selection be enough?

Thanks in advance for your thought on these questions

Peter
128x128pbnaudio
Some form of loading options, whether front panel or not, is helpful. As far as convenience is concerned, switching by remote control is the best because you can make an instantaneous comparison (my Levinson No. 32 preamp allowed such change, the unit I currently use does not).

However, a switch of any kind is always less than ideal, even when it comes to loading. Companies, like Artemis, offer an internal spot to insert the chosen resistor which is then securely clamped. This is really NOT cheaper than a selector switch, but, it is better for the sound.

My current phonostage (Viva Fono) has no provision for loading change. What I have to do is open the chassis and very carefully solder in a resistor between the hot and ground at the back of the RCA jack (an area full of hair thin wires). This approach means I am loading on the primary side of the step up transformer. I suppose this is done for sound quality reasons; at this price level, I doubt that the lack of convenient switching is a cost saving measure. I have made my own external load resistors using radio shack resistors and RCA jacks to test different loading. When I find what works, I can then hardwire in better quality resistors and remove the extra jack.

I like the loading options offered in the new model described by the original poster-- 100, 220, 330, 500 and 47,000. It is more important to have smaller incremental steps near the most useful part of the range wich is around 100 ohms. Ideally there would be more choices in that range, such as 125 or 150, and maybe something near 1,000.
T bone, shoot me an email with your address and I will ship you a unit once we have one ready

Peter
I would be up for Beta testing as I am actually looking for a new phono stage at the moment and having a mono option is one of criteria.
Hi Nick

Shoot me an email with your ship to address as well and yo can be part of the group too

Peter