Ron’s New System

[Ron Resnick]

too small a cable cross-section and too high a capacitance 124 pf /m. search for a cable 50-60 pf /m otherwise there is a rolloff below 20khz.

David Karmeli of Vintage Audio Specialties recommended this specific cable in my specific application. You'll have to take it up with him.

 

[Ron Resnick]

JA100s have three transformer tap options:

"1 ohm"

"4/8 ohms"

"up to 8 ohms"

These JA100s currently are set at the "up to 8 ohms" position.

"4/8 ohms" I assume would be the best setting for my 6 ohm speakers, but apparently changing the setting is a bit of a project. So "up to 8 ohms" it is.

Does anybody know what is the practical difference in power transfer or sonic results between "4/8 ohms" and "up to 8 ohms" for a 6 ohm loudspeaker load?

 

[microstrip]

David Karmeli of Vintage Audio Specialties recommended this specific cable in my specific application. You'll have to take it up with him.

IMO you are the owner and the listener - we are responsible for our enlightened choices, as any audiophile. I also found bizarre the idea of choosing a quad star cable for a very long length of single ended interconnect - my aim would would also be low capacitance. Star quad is usually used for balanced mode. How are you strapping it for single ended?

 

[Another Johnson]

JA100s have three transformer tap options:

"1 ohm"

"4/8 ohms"

"up to 8 ohms"

These JA100s currently are set at the "up to 8 ohms" position.

"4/8 ohms" I assume would be the best setting for my 6 ohm speakers, but apparently changing the setting is a bit of a project. So "up to 8 ohms" it is.

Does anybody know what is the practical difference in power transfer or sonic results between "4/8 ohms" and "up to 8 ohms" for a 6 ohm loudspeaker load?

Your speaker impedance is not a constant. It is a complex impedance with frequency dependent resistance and reactance.

The best way to decide which is best is to try both. Listening is the only way to decide.

 

[microstrip]

I would not see why it's a problem. Brian Berdan thinks it's no problem.

Why do your two preamps not allow it?

It can be a problem in your specific case. The non inverted phase will see a high capacitive load twice as high as that of the the inverting phase. This harms the intrinsic common mode rejection ratio of the balanced mode, that asks for equal loads in both phases. Was Brian Berdan aware of all the details of your long IC system?

 

[Ron Resnick]

 

[Argonaut]

David Karmeli of Vintage Audio Specialties recommended this specific cable in my specific application. You'll have to take it up with him.

And his technical reasoning being what exactly Ron ?

 

[Hi-FiGuy]

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Jadis make good looking and fantastic sounding equipment. I am not a tube guy but was always blown away by them every time I heard them at the other Berdan store.

 

[Ron Resnick]

IMO you are the owner and the listener - we are responsible for our enlightened choices, as any audiophile. I also found bizarre the idea of choosing a quad star cable for a very long length of single ended interconnect - my aim would would also be low capacitance. Star quad is usually used for balanced mode. How are you strapping it for single ended?

I am using the Belden 1192A as a balanced cable.

My personal initial cable choice was Mogami 2791, not a star quad cable, for lower capacitance.

 

[Ron Resnick]

And his technical reasoning being what exactly Ron ?

You would have to ask David. He told me he listened to Belden and Mogami and other similar cables and liked the sound of 1192A best.

 

[Ron Resnick]

It can be a problem in your specific case. The non inverted phase will see a high capacitive load twice as high as that of the the inverting phase. This harms the intrinsic common mode rejection ratio of the balanced mode, that asks for equal loads in both phases. Was Brian Berdan aware of all the details of your long IC system?

Is your point that the TL-7.5 Series III inverts the single-ended outputs but does not invert the balanced outputs?

 

[Ron Resnick]

The Sorbothane-footed (which everybody loathed) walnut blocks are back in service under the JA100s!

 

[christoph]

I would not see why it's a problem. Brian Berdan thinks it's no problem.

Why do your two preamps not allow it?

Good for you that it works.
I have no clue why mine aren't allowed to be used simultaneously.

 

[Ron Resnick]

Good for you that it works.
I have no clue why mine aren't allowed to be used simultaneously.

I won't know if it works until I actually try it.

 

[DasguteOhr]

David Karmeli of Vintage Audio Specialties recommended this specific cable in my specific application. You'll have to take it up with him.

I bow to Lord Vader but even he can't override physics. If I understand you correctly, each channel is 50ft Belden 129pf/m+ Mogami 89pf/m for amp and bass tower correct? This results in a capacitive load of 3.4nf. Vtl says with 20ft /900pf a linear frequency range has no audible influences. What happens at almost 4 times the capacitive load. I could now use formulas to calculate exactly what is happening. I want to teach someone as long as you are happy. I would use the sommercable for both.

 

[Ron Resnick]

I am not defending David's cable selection. David's disciples, Peter and Tim, are welcome to do that if they wish.

I engaged David for his amazing turntable expertise, nothing more. Left to my own devices I would have used Mogami 2791.

Once I figure out whether I can, and if I can, if I want to, convert the panel interconnect runs to single-ended I will try Cardas Clear Beyond or maybe Iconoclast interconnect.

 

[tima]

I am not defending David's cable selection. David's disciples, Peter and Tim, are welcome to do that if they wish.

I engaged David for his amazing turntable expertise, nothing more. Left to my own devices I would have used Mogami 2791.

Once I figure out whether I can, and if I can, if I want to, convert the panel interconnect runs to single-ended I will try Cardas Clear Beyond or maybe Iconoclast interconnect.

David is a dealer who gives options to his customers and never tells them what to choose. Ron makes his own choices.

I tried various audiophile, Gotham, Mogami, Gepco, and the same Belden IC at 24ft in my system. I chose the Belden based on listening. There is nothing to defend.

 

[Argonaut]

For those longer runs A.R.T sell their DIY cable in 50m and 100m rolls :

A.R.T. Hi-Fi

art-hifi.com

 

[bonzo75]

Oh, one more small thing.

I have always described my introduction to high-end audio by Michael Kay of Lyric Hi-Fi in New York when he ushered me into his main listening room with Infinity IRS V, Goldmund Reference turntable, Benz Ruby cartridge and Jadis JA200s as my first religious experience of an audio nature. He played Reference Recording's Symphonie Fantastique, and I was hooked!

Flemming conscientiously designed the Pendragons to be a reimagined and simplified Infinity IRS V.

So there is an elegant and almost emotional closing of the circle for me to try Jadis amplifiers on the Pendragons.

cool, very nostalgic experience with current system

 

[jadis]

I am picking up the Jadis JA100s today!

I am going to try using the single-ended VTL outputs (run side-by-side with the balanced cables going to the woofer towers using the VTL balanced outputs at the same time).

The amps are arriving with Electro Harmonix KT90 tubes. I am working on finding NOS Siemens EL34s. NOS Mullard EL34s might be "too much of a good thing" with Jadis.

I am not sure which transformer taps the JA100s presently are set for.

Hi Ron,

Nice to hear you about your Jadis amps. Have you checked the user's manual if the supplied KT90s can be switched with EL34s on the fly? Long ago, when I had the JA200 monos my dealer told me there needs to be some adjustment to be done when moving from KT88s to EL34s. I just am not sure what adjustment was needed. Jadis with EL34 should be really sweet sounding. I heard them only once , with a JA30.