Anyone using 1 watts instead of 1/2 watts?

[Cantplay]

I'm going to be using AMRG resistors for the next build.

http://www.amtrans.co.jp/products/amrgj/index_e.shtml

John

[gingertube]

You need to be VERY careful where you use 1/2 watt metal films. Most of them are rated at no more than 300V maximum.
I use 2 watt routinely, for their voltage rating, plus it helps the "old fart" eyes when reading component values.

I have used 1/2 watt metal films as a last resort when the component bin was empty of what I needed BUT always use 2 resistors of 1/2 the required value in series to make sure they survived the voltage.

Cheers,
Ian

[renshen1957]

You need to be VERY careful where you use 1/2 watt metal films. Most of them are rated at no more than 300V maximum.
I use 2 watt routinely, for their voltage rating, plus it helps the "old fart" eyes when reading component values.

I have used 1/2 watt metal films as a last resort when the component bin was empty of what I needed BUT always use 2 resistors of 1/2 the required value in series to make sure they survived the voltage.

Cheers,
Ian

Hi Ian,

I use 2 resistors of twice the required value in parallel to survive the voltage. I like the shared voltage idea of series method, and it looks cooler, too.

Best regards,

Steve

[renshen1957]

The Dumble forum turned me on to the MF that Alexander Dumble used in his amps, which are also available Mouser

Steve which brand or type is available to use in Dumble builds?. The PRP are good resistors.

Hi,

The 1W Dale miltary spec metal film resistors are the most commonly available and still in production.

Best regards,

Steve

[Structo]

I usually use 1W resistors for the bigger size and voltage rating.

[renshen1957]

Steve, what are PRP resistors? I'm not up to speed on these. In fact completely unfamiliar. Thanx much, LG

Hi LG,

Others have commented before I could reply (12 hour rode trip from LA into Phoenix and back), but here are my reasons

PRP resistors were a Hi-Fi cross pollination or that's where I first came across them. Company claims that their "formula, etc. was designed for low noise audio path, bla bla bla...."

Well I take most Hi-Fi advertising copy with a grain of salt, but the company is a US company, the lead lengths work for me, the build quality is excellent and when tested were very quiet (I know MF are quiet), plus there's that red color and the component value on the side.

I've found a number of companies that niche market or specialist manufacturers produce very high quality products.

These resistors aren't something you'd find being used in consumer grade products.

Have you ever purchase parts from Mouser? (Rhetorical question for most). I do, especially for my company as well as for some parts (KOA "Kiwame" 2W Carbon Film, etc) for amp builds.

The country of origin is printed on the box or plastic baggy. So one day when repairing a Fender PCB amp, I look at the supposed made in the USA (or so Fender claims) MF resistors and it looks exactly the same/clone as the resistors from Mouser that have a from a third world country. I measure both with a micrometer, spot on the same diameters.

So I get to thinking, if a big manufacturer who justifies that their products are made in the USA (I believe the percentage is over 75% US country of origin to meet this threshold) wanted to cut corners, who is going to know or be able to tell?

Enter the PRP resistors. Wow, there's no mistaking who made these, the company is from the US.

And yes, there are people who want 100% US made products. Which can be tricky, I have a stash or US Military surplus tube sockets, I'm almost out of US Reverb pans, some surplus stores have the electrical switches, etc. But frankly, the US doesn't make very much electronics or electrical parts any more, or mechanical parts, something as common as a stainless steel screw. Does a screw make a difference, sonically? No, but if I produce something that is made in the USA, it better be 100% sourced or I am misleading the customer.

Well in a repair or new build, I can point to the PRP resistor and confidently say, made in the USA, and not be fibbing.

Ironically, these are considered cheap resistors among the the Hi-Fi DIY crowd for bargain builds.

I primarily use these for cathode resistors in my builds. When the build is predicated on purchasing the very best available parts country of origin not an issue, I still use the PRP MF resistors.

Ironically, these are considered cheap resistors among the the Hi-Fi DIY crowd.. I primarily use these for cathode resistors in my builds when the country of origin is not an issue.

Best regards,

Steve

[renshen1957]

I'm going to be using AMRG resistors for the next build.

http://www.amtrans.co.jp/products/amrgj/index_e.shtml

John

Hi John,

I've used their CF resistors to replace Riken resistors (no longer in production).

Best regards,

Steve

[renshen1957]

Randall, I've been using Xicon 1-watt MF resistors in my recent builds. Mouser series 294-[value]-RC. Example 100K. $0.15 each for 10 or more, $0.08 for 100!

Just posted a photo of my finished 18-watt Stout using these resistors.

Hi,

I am under the impression that Xicon is just Mouser's house brand name for components sourced from different manufacturers purchased overseas in Asia. The company address for Mouser and Xicon are the same, 1000 N Main St Mansfield, TX 76063.

I tried to purchase 1/4 watt MF in China, and my agent over there had great difficulty finding the values I required outside of Shanghai. When I pointed out that China produces electronics ect, that use this Watt value resistor, the suppliers chuckled and said 1/4 watts are sourced from other Asian countries in bulk, it's cheaper. I went up to 1/2 watt and 1 watt resistors made in China, but its easier to just order in bulk from Mouser.

The company address for Mouser and Xicon are the same, 1000 N Main St Mansfield, TX 76063.

Best regards,

Steve

[hbamp]

http://www.hificollective.co.uk/compone ... stors.html

I use Arcol and I realy think they are a very good alternative for the AB's.
500V.

[renshen1957]

http://www.hificollective.co.uk/compone ... stors.html

I use Arcol and I realy think they are a very good alternative for the AB's.
500V.

Hi,

I use RCD 1/2 watt CC resistors (made in the USA) for a new construction resistor in place of the ABs, when it has to be RoHS
compliant, and has a temperature rating to 150C. I purchase these from www.justradios.com in Canada.

The 1/2W RCDs are 5% CC. RCD has 1 Watt resistors rated for 500V, too. http://www.rcd-comp.com/rcd/rcdpdf/CC-FA001.pdf

The Arcols are rated to a top heat of 125C for heat. The resistor is from Japan as opposed to Kamaya which is from China which most vendors stock.

Arcol resistors I have purchased are quality build on their Carbon films. I would say the same for any product out of Japan.

Just radios picked up a Carbon Film Flame proof resistor in 1W and 2W values. They stock 330K ohms to 22M ohms (depending on wattage).

Just Radios's resistor page lists Flame Proof Metal Glaze 1W resistors in 30M, 40M, and 50M, I am tempted to try the 40W value in a Dumble Build instead of four 10M Carbon Film resistors. http://www.justradios.com/resistors.html

Their order page contains simple tables, and is a bit hard to find the new stuff above either of the above. If interested you may want to email the owner for assistance.

Just Radios carries a variety of capacitors, too. No, I am not related; the company is a smaller specialty firm which I found to have excellent, personalized service.

I purchase most of my metal film and carbon film resistors from PartsConnexion.com, also in Canada.

I will have to check these out the Arcol CC.

Best regards,

Steve