5 Watt Resistors on Aleph 4 and Holco Resistors

[diyman]

Wuffwaff,

I've been looking high and low for a source of these resistors. Does the vendor in Germany do international sales? I was given to understand that using these non inductive resistors in power amplifiers do make a significant difference in the sound. Anybody else know a source for these resistors?

ckt

[tvi]

<a href="http://www.thlaudio.com/"><b>thlaudio</b></a> (Taiwan) list the MPC71 as wirewound, can't find any prices.

Regards
James

[wuffwaff]

ckt,


try http://www.schuro.de for info on these resistors. You can call them at +49 561 16415 or fax +49 561 770318.

william

[arsa]

Originally Posted by wuffwaff

nicharis,

do you mean the white rectangular resistors often used in Japanese amplifiers?
They are MPC71 types, 5W, induction free.

You can get them in all sort of values from 0,1 to 1 Ohm with a 10% tolerance.

I´ve ordered them for the Aleph 5 I´m building.

The alternative is using metal oxide resistors of 1-2 watts and use a few in parallel. I did this with my current power amp (5x1Ohm) cause when I build it the resistors mentioned above were not available and the amp definitely did not like wirewound types (oscilation).

I don´t know where you live but the MPC71 are available in Germany for 0,60€ a piece.

william

Hi Wuffwaff,

please write where in Germany can I find this MPC71.

thanx

[generg]

Here

5W Metallband 10% MPC71

[jameshillj]

Shuro (diy4you, etc) won't even talk to you outside Europe, same as Buerklin - can get the similar product (MCP74) from a guy in China via his "tubeshunter" monica on eBay - get a few and measure them on a good meter - reasonably accurate, and consistent.
These reistors use a Ni-Chr-Al compound and are reasonably detailed without being too bright, unlike many metal power resistors.

[triode_al]

I have used Fukushima for my F5 (source degradation). Indeed, they do not all measure very accurately, but I could match them enough. And the wires get loose quickly if you twist them. But they are great because you can bolt them with a washer to a heatsink (such as in my powersupply). I am ordering MPC71 types now for replacement in my Le Monstre and in a Le Classe A. I also bought BPR56 types.

As to sound - my finished F5 is marvelous in details even on a hard to drive electrostatic speaker.
albert