Using RN65Ds on both plate and Cathode?

Joost · Post by **Joost** » Sun Apr 10, 2011 8:59 am

I ordered my parts for a 124 build and saw in the schematic that the cathode resistors should be 1% metal film Mepco/Electra. But since I couldn't find them, I also got RN65D resitors for the cathode. Is that ok? Would it matter, metal film is metal film right?

Mark · Post by **Mark** » Sun Apr 10, 2011 11:43 am

I could be wrong, but you wouldn't think so. Metal films are metal film resistors.

Joost · Post by **Joost** » Sun Apr 10, 2011 1:41 pm

Mark wrote:I could be wrong, but you wouldn't think so. Metal films are metal film resistors.

Yeah, I thought that too, but what trips me up is that HAD used different metal films for the plate and the cathode

ChrisM · Post by **ChrisM** » Sun Apr 10, 2011 2:07 pm

Joost wrote:I ordered my parts for a 124 build and saw in the schematic that the cathode resistors should be 1% metal film Mepco/Electra. But since I couldn't find them, I also got RN65D resitors for the cathode. Is that ok? Would it matter, metal film is metal film right?

That's fine cathode resistor's aren't a huge deal.
I usually use some brand of metal fim there.

The Mepco/Electra he used there are long gone, so good luck finding them.

glasman · Post by **glasman** » Sun Apr 10, 2011 2:13 pm

The primary reason for using a metal film in the cathode is for temperature stability. Just use a decent quality MF resistor, Dales, Koa etc. Stay away from Xicon MFs, just my experience, but I find they add a nasty edge to the sound.

ToneMerc · Post by **ToneMerc** » Sun Apr 10, 2011 2:16 pm

glasman wrote:The primary reason for using a metal film in the cathode is for temperature stability. Just use a decent quality MF resistor, Dales, Koa etc. Stay away from Xicon MFs, just my experience, but I find they add a nasty edge to the sound.

I like to use the Dale CCF60 there.

TM

ChrisM · Post by **ChrisM** » Sun Apr 10, 2011 2:21 pm

ToneMerc wrote:
glasman wrote:The primary reason for using a metal film in the cathode is for temperature stability. Just use a decent quality MF resistor, Dales, Koa etc. Stay away from Xicon MFs, just my experience, but I find they add a nasty edge to the sound.
I like to use the Dale CCF60 there.

TM

My choice too! Nice resistors!

Joost · Post by **Joost** » Sun Apr 10, 2011 3:34 pm

glasman wrote:The primary reason for using a metal film in the cathode is for temperature stability. Just use a decent quality MF resistor, Dales, Koa etc. Stay away from Xicon MFs, just my experience, but I find they add a nasty edge to the sound.

Yeah, that's what I thought too. But apparently, on the anode side, the brand of metal film does influence the sound (which makes sense), so I just wanted to make sure.

thanks!

Structo · Post by **Structo** » Sun Apr 10, 2011 4:10 pm

I like the CCF60 resistors as well.

Don't get any of those PR01 resistors. Even though they are spec'd for 1 watt they are tiny and about the size of a normal 1/8 watt resistor.

Drumslinger · Post by **Drumslinger** » Sun Apr 10, 2011 6:57 pm

+1 as well for the CCF60s.

tele caster · Post by **tele caster** » Mon Apr 11, 2011 2:39 am

Any opinions on the CMF60's, that the tubedepot sells?

ToneMerc · Post by **ToneMerc** » Mon Apr 11, 2011 3:10 am

tele caster wrote:Any opinions on the CMF60's, that the tubedepot sells?

Yeah, I've used those micro RN65D like resistors a couple times at the cathode location, no complaints. Matter of fact, at my most recent TD order I picked a few of the 1.5k's again for that purose.

thyx · Post by **thyx** » Mon Apr 11, 2011 2:52 pm

glasman wrote:Stay away from Xicon MFs, just my experience, but I find they add a nasty edge to the sound.

Even when bypassed?

The Amp Garage

Using RN65Ds on both plate and Cathode?

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