ADC ZLM compliance?

the thin end of the wedge
dewiseman
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ADC ZLM compliance?

Post by dewiseman » 14 Jan 2019 04:07

I can't seam to find the compliance on this cartridge.

2002afan
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Re: ADC ZLM compliance?

Post by 2002afan » 14 Jan 2019 19:13

This is all I could find on it. From LP gear (see blow). I also found an old article from THE Canadian Stereo Guide that stated output per cm/sec of groove velocity (at 1kHz) 1.125mV

ADC ZLM Cartridge Details
- Frequency response: 20Hz - 20kHz ± 1.0dB; 20Hz - 26 kHz ± 1.5dB
- Output: 3.5 mV
- Stylus type: Nude Aliptic diamond tip
- Diamond tip dimensions: 0.0002" scanning radius × 0.0015 bearing radius
- Tracking force: 0.5 - 1.25 g ± 0.25 g
- Output balance: 1dB max difference
- Channel separation: 30 dB at 1kHz; 20 dB at 10kHz
- Inductance: 580 mH
- Resistance: 820 ohms
- Load resistance: 47,000 ohms
- Load capacitance: 275 pF
- Cartridge weight: 5.75 grams

Hope this helps.
Cheers.

2002afan
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Re: ADC ZLM compliance?

Post by 2002afan » 14 Jan 2019 19:31

Found the compliance. 30cu. No other values shown. Hopes this help too.
Cheers

abril
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Re: ADC ZLM compliance?

Post by abril » 14 Jan 2019 19:41

The last article here suggests the ZLM had an arm resonance at 9.8Hz on an SME3009 (presumably a fixed headshell model).
https://www.voenixrising.com/pdf/adc_zlm.pdf
https://www.vinylengine.com/cartridge_r ... mit=Submit

Assuming a cartridge mass of 6g this seems to imply a compliance of about 22cu

2002afan
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Re: ADC ZLM compliance?

Post by 2002afan » 14 Jan 2019 19:53

Having difficulty attaching the ADC chart I found this info on.

2002afan
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Re: ADC ZLM compliance?

Post by 2002afan » 14 Jan 2019 20:27

The chart (ADC Specification Chart) was originally provided on V/E on January 28, 2018 by V/E member audiodk during a forum discussion. During the discussion, it was stated that it was only good for original stylus. The chart did not take any turntable arms into account.
The compliance value of 30cu was given for the following Gold body ADC carts:
Astrion
ZLM
XLMIII
XLM Improved
The compliance value of 50cu was given for:
XLMII
XLM
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dewiseman
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Re: ADC ZLM compliance?

Post by dewiseman » 09 Feb 2019 22:08

Thanks so much everyone. This cart is a ZLM imp. omnipivot. Are these MM or MI carts?

2002afan
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Re: ADC ZLM compliance?

Post by 2002afan » 09 Feb 2019 22:42

dewiseman wrote:
09 Feb 2019 22:08
Thanks so much everyone. This cart is a ZLM imp. omnipivot. Are these MM or MI carts?
Moving magnet. You can find information in the Database section.
Cheers,
WillO

dewiseman
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Re: ADC ZLM compliance?

Post by dewiseman » 10 Feb 2019 02:31

That's what I thought but I read a post that listed ADC carts as Moving Iron. This post all started because I saw that LP Gear has Shabatta stylus for sale and wondered if it would be much of an upgrade over the Aliptical stylus. I wanted to check with them as to the compliance of that stylus.

2002afan
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Re: ADC ZLM compliance?

Post by 2002afan » 10 Feb 2019 03:11

The database showed that the made a few induced magnet ones, series 10E.
Cheers,
WillO

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Re: ADC ZLM compliance?

Post by BMRR » 11 Feb 2019 16:17

dewiseman wrote:
10 Feb 2019 02:31
That's what I thought but I read a post that listed ADC carts as Moving Iron.
They are Induced Magnet, which is similar to Moving Iron but slightly different because most Moving Iron carts have the magnet inside the cartridge body, whereas the ADC ZLM, XLM, etc. have the magnet in the stylus housing, sort of hovering above the cantilever. The similarity to Moving Iron is that the magnet is stationery and does not move -- hence, these cartridges are not Moving Magnet.

2002afan
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Re: ADC ZLM compliance?

Post by 2002afan » 11 Feb 2019 18:05

BMRR wrote:
11 Feb 2019 16:17
dewiseman wrote:
10 Feb 2019 02:31
That's what I thought but I read a post that listed ADC carts as Moving Iron.
They are Induced Magnet, which is similar to Moving Iron but slightly different because most Moving Iron carts have the magnet inside the cartridge body, whereas the ADC ZLM, XLM, etc. have the magnet in the stylus housing, sort of hovering above the cantilever. The similarity to Moving Iron is that the magnet is stationery and does not move -- hence, these cartridges are not Moving Magnet.
Someone needs to update the Database. :lol:
Cheers,
WillO

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Re: ADC ZLM compliance?

Post by wolfie62 » 12 Feb 2019 06:17

MI= Magnetic Induction, in the case of the ADC models.

But yes, it has a very thin soft iron sheath (armature) placed in the magnetic field of the stylus frame's bar magnet. ADC made good on its claims of having the least amount of moving mass of any MM or MC carts in its day, 1976-1982. It still has a valid claim over a vast majority of MM and MC carts today. That is why the XLM/ZLM/Astrion carts are still sought after today. They have a unique effortless sound that is quite neutral and flat. Trouble is, most aftermarket styli have not paid attention to the fine details in replicating the ADC styli. They get the cantilevers too long, the armatures too heavy and long, or the pivot blocks use substandard rubber compound.

dewiseman
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Re: ADC ZLM compliance?

Post by dewiseman » 14 Feb 2019 04:44

I was thinking of getting the LP gear shabatta stylus, anyone how they compare?

wolfie62
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Re: ADC ZLM compliance?

Post by wolfie62 » 14 Feb 2019 07:17

Of the aftermarket styli I have tried, LP Gear and Jico are the closest to OEM in sound performance.

I usually go small; I try the elliptical first, and do a listening test against an original stylus. If it measures up, then I go big for the exotic cuts. But that’s me.

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