Source for resistors for an acoustech/sutherland phono preamp


Could someone give me a link to buy resistors 47k and under. I bought some but they are much bigger than what they replaced. I have an Ortofon black that I’m tweaking by using resistors under 47k. I’m trying to expand the bottom end. The ortofon specs call for 50k to 200k loading. I’ve read that under 50k is optimal. I know this sounds wrong and contradicts Ortofon but I can't  get the bottom end that my Dynavector 20x2 had. The resistors are an easy switchout but the ones I got from Parts Connexion are huge. About 10 times or more larger. Would the size affect performance?

128x128blueranger

Size does not affect performance only space.

Most likely you ask for 50-200ohms for mc loading.

Check metal films like, takman, holco, or if you want something more expensive charcroft & vishay both z foils.

A good place to check is Hifi collective and Parts connexion.

 

The wattage determines the size of the package and today's resistors are made in much smaller package size. I'm thinking a 1/4 watt metal film resistor will be plenty small. What exactly did you order?

 

BillWojo

Sounds like you didn’t pay attention to the wattage. Phonos need very low wattage. 0.25 would be plenty.

Yes, it matters but not in your work right now. :)

If you’re in the US, Mouser, Digikey, and others sell resistors by mail order. For phono you want high quality. Michael Percy Audio has them. Texas Instruments TX2575 ( from TI on line) or Caddock TF020 (from Percy) are both excellent. So are the brands mentioned above. Even 1/4 Watt is overkill for this. I question the wisdom of what you’re planning to do and the rationale for it but have fun.

Thanks for the responses! I ordered some lower wattage resistors to play around with .

Changing loading isn't going to help your bottom end much. It basically just changes the top end. 

Perhaps play with VTA and VTF instead? 

Changing loading isn't going to help your bottom end much. It basically just changes the top end. 

This statement is misleading.

Changing the top end response can in some instances alter the perception of the bottom end by changing the balance - everything is related - even a low bass note has fundamentals, harmonics that reach up into the higher frequencies.

     Plus a BIG ONE for ordering from Michael Percy AND, "high quality"!

     For a pittance: he was matching components to within 1% tolerance for me.

     Began our transactions 20+ years ago and never a moment's disappointment.

                                   https://www.percyaudio.com/

Vishay metal foil are the resistors of choice for cartridge loading, or at least they were last time I paid any attention. I do think though that getting VTA and VTF tuned in properly with a shibata stylus should be your first priority. I assume it’s a 2M black and not a quintet or cadenza, there’s more at stake with resistive loading of a moving coil.

Nude Vishays took over from the ones that are potted. These days Texas Instruments is the US source for what look like nude Vishay, series TX2575, at about $12 each. Caddock TF020 from M Percy sound just as good for more like $5 each, but the form factor can be a little tricky to install. My opinions of course.

I just reached out to Michael Percy regarding some high quality 47k, 100K, 100R, 1000R rca plugs for my JLTI that I'm finally using after 3 years. It had a terrible hiss, so I put it in the closet. Recently Chakster helped me get the Luxmann up with arms and carts, JLTI is loaded and sounds great. No hissing. Still need those MM plugs!

Expensive resistors are not going to cure hiss, unless an existing resistor is "broken", in which case any fully functional resistor of the same value and equal or better voltage and wattage rating will also cure the hiss.  What I am saying is that cheap or run of the mill resistors that are fully functional at their rated value in ohms are not the cause of hiss.

But apparently putting your JLTI in the closet for a few years did cure the hiss.

is it true that using Shunyata Black Mamba and Audioquest King Cobra together changes the hiss level?