John Curl's Blowtorch preamplifier part II - Page 388

Joachim Gerhard · 9th March 2010, 08:25 PM

I hope you find a good one that is not so expensive.

Speedskater · 9th March 2010, 10:53 PM

Quote:

Originally Posted by simon7000

I have managed samples of the naked Vishays, and the old stock Roderstein, where do I get 4 1K corning greys? I haven't seen any Corning's for 30 years.

I have some Corning 1001F, NA55, RN55D resistors.

But they look more Blue than Gray.
I also have some Green Cornings.

1audio · 9th March 2010, 11:42 PM

Simon:
PM me with your address and I'll send a few resistors for you to try on your fixture. I'll be happy to put anything you want through my equipment. Fortunately resistors are small.
-Demian

john curl · 10th March 2010, 01:31 AM

Grey only.

john curl · 10th March 2010, 04:05 PM

It is important to understand that Corning has made MANY precision resistors over the decades. The Corning Resistors that we first found that sounded pretty good, were GREY
in color. In the early '80's Corning switched to GREEN and Blue. Both new models are a compromise over the GREY. This is when we switched over to Roderstein in making Vendetta Research products and still use them, today, when possible.

Speedskater · 10th March 2010, 07:06 PM

I found a few GREY from about 1980 to 1983, but the value is way wrong 150K.

NA60
RN60D
1503F

john curl · 10th March 2010, 07:12 PM

Jocko will send 1K Corning greys, if asked.

john curl · 11th March 2010, 04:00 PM

About 25 years ago, I compared Corning Grey resistors with Corning Green and Blue resistors. I had the help and advice of a promising colleague, Scott Wurcer, in doing so, because he showed me how to make a adaptor for my Quan-Tech Noise Analyzer so that it could measure EXCESS noise. Green and Blue resistors were distinctly inferior with 10V DC applied to them, compared to the Corning Grey. This is but one difference, but at least it was measurable.

john curl · 12th March 2010, 03:24 AM

Tried a dual 10K 10 turn wirewound pot today. Works very good as a load for MC cartridges. No partition noise that I could hear, but then I am 68 years old.

Joachim Gerhard · 12th March 2010, 03:45 AM

Invite my son. He is 16 and still hears to 20kHz.
He is not a big party animal so exposure to high volume was limitted.

9th March 2010, 11:42 PM	#3873
1audio diyAudio Member Join Date: Mar 2004 Location: SF Bay Area Blog Entries: 2	Simon: PM me with your address and I'll send a few resistors for you to try on your fixture. I'll be happy to put anything you want through my equipment. Fortunately resistors are small. -Demian __________________ Demian Martin Product Design Services

10th March 2010, 07:06 PM	#3876
Speedskater diyAudio Member Join Date: Sep 2002 Location: Lakewood, Ohio	I found a few GREY from about 1980 to 1983, but the value is way wrong 150K. NA60 RN60D 1503F __________________ Kevin

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9th March 2010, 08:25 PM	#3871
Joachim Gerhard diyAudio Member Join Date: Mar 2009	I hope you find a good one that is not so expensive.

10th March 2010, 01:31 AM	#3874
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Grey only.

10th March 2010, 04:05 PM	#3875
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	It is important to understand that Corning has made MANY precision resistors over the decades. The Corning Resistors that we first found that sounded pretty good, were GREY in color. In the early '80's Corning switched to GREEN and Blue. Both new models are a compromise over the GREY. This is when we switched over to Roderstein in making Vendetta Research products and still use them, today, when possible.

10th March 2010, 07:12 PM	#3877
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Jocko will send 1K Corning greys, if asked.

11th March 2010, 04:00 PM	#3878
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	About 25 years ago, I compared Corning Grey resistors with Corning Green and Blue resistors. I had the help and advice of a promising colleague, Scott Wurcer, in doing so, because he showed me how to make a adaptor for my Quan-Tech Noise Analyzer so that it could measure EXCESS noise. Green and Blue resistors were distinctly inferior with 10V DC applied to them, compared to the Corning Grey. This is but one difference, but at least it was measurable.

12th March 2010, 03:24 AM	#3879
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Tried a dual 10K 10 turn wirewound pot today. Works very good as a load for MC cartridges. No partition noise that I could hear, but then I am 68 years old.

12th March 2010, 03:45 AM	#3880
Joachim Gerhard diyAudio Member Join Date: Mar 2009	Invite my son. He is 16 and still hears to 20kHz. He is not a big party animal so exposure to high volume was limitted.