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Offline patsuh  
#1 Posted : 25 March 2020 10:40:12(UTC)
patsuh


Rank: HIFI Newbie

Joined: 28/09/2010(UTC)
Posts: 9
Dominican Republic
Location: dominican republic

Thanks: 1 times
Dear Martin:
We are using a koetsu rosewood cartridge with sme309 installed in a thorens td550 turntable.
As far as we see the cartridge specs are :
Body: Rosewood
Type: moving coil
Coil wiring: copper
Magnet: Samarium cobalt
Cantilever: boron
Output: .4mV
Frequency range: 20Hz-100kHz
Channel separation: 25dB/1kHz
Inner impedance: 5 ohms
Channel balance: .5dB/1kHz
Recommended impedance: 30 ohms
Weight: 8.9g

Compliance: 5x10-6cm/dyne at 100Hz
Recommended Tracking Force: 1.8-2.0g
Recommended Load: 80-1,000 Ohms


SME tonearm total mass weight is 9.5 grams
We are using a naim superline phono stage with 1k resistor and hicap dr power supply

First: does this cartridge fits well with sme 309
And resistor value some people to use a 100 ohm value ?
How can we understand this parameters and get the best results?
Offline Martin Colloms  
#2 Posted : 26 March 2020 17:14:18(UTC)
Martin Colloms


Rank: Moderator

Joined: 15/07/2008(UTC)
Posts: 3,039

Was thanked: 48 time(s) in 47 post(s)
Dear Martin:
We are using a koetsu rosewood cartridge with sme309 installed in a thorens td550 turntable.
As far as we see the cartridge specs are :
Body: Rosewood
Type: moving coil
Coil wiring: copper
Magnet: Samarium cobalt
Cantilever: boron
Output: .4mV
Frequency range: 20Hz-100kHz
Channel separation: 25dB/1kHz
Inner impedance: 5 ohms
Channel balance: .5dB/1kHz
Recommended impedance: 30 ohms
Weight: 8.9g

Compliance: 5x10-6cm/dyne at 100Hz
Recommended Tracking Force: 1.8-2.0g
Recommended Load: 80-1,000 Ohms


SME tonearm total mass weight is 9.5 grams ( effective moving mass)
We are using a Naim Superline phono stage with 1k cartridge load resistor and Hicap DR power supply

First: does this cartridge fit well with SME 309

Answer: just fine I had one myself

Second : And resistor value some people to use a 100 ohm value ?

Answer The sound varies only a little with exact resistance load, 100 -1000 Ohms will not alter the sound much.
Too far below 100 Ohms and there will be some loss of output.

The Koetsu cartridge compliance and arm effective mass are well matched here.

Do not use arm damping unless absolutely neccessary

Martin
thanks 1 user thanked Martin Colloms for this useful post.
patsuh on 27/03/2020(UTC)
Offline patsuh  
#3 Posted : 27 March 2020 07:24:22(UTC)
patsuh


Rank: HIFI Newbie

Joined: 28/09/2010(UTC)
Posts: 9
Dominican Republic
Location: dominican republic

Thanks: 1 times
Hi Martin:
we always believe about your thoughts and findings as the best in audio
business, being honest we bought those naim products based on this.
perhaps, our only concern is why naim phono stage have their inputs in the unit and outputs in the power supply?
in terms of audio quality it has to suffer and the cable itself it looks pretty ordinary nothing special,
then it doesn’t make sense to use a high quality interconnects between power supply and preamplifier
we are using cardas golden reference but thinking of
getting a pr of transparent reference gen5 instead.

can you explain me why this?
Offline Martin Colloms  
#4 Posted : 27 March 2020 09:17:25(UTC)
Martin Colloms


Rank: Moderator

Joined: 15/07/2008(UTC)
Posts: 3,039

Was thanked: 48 time(s) in 47 post(s)
Hi Martin:
we always believe about your thoughts and findings as the best in audio
business, being honest we bought those naim products based on this.
perhaps, our only concern is why naim phono stage have their inputs in the unit and outputs in the power supply?
in terms of audio quality it has to suffer and the cable itself it looks pretty ordinary nothing special,
then it doesn’t make sense to use a high quality interconnects between the Naim power supply and my preamplifier
we are using cardas golden reference but thinking of
getting a pr of transparent reference gen5 instead.
can you explain me why this?

MC >>> A foundation of NAIM design practice is hierarchical grounding where the more delicate and sensitive sections , in this case the phono stage, begin the ground path, then on to the local power supply , then to the preamp and then to the power amp. Ground loops , e.g. more than one ground (power supply and/or signal) from one section to another, which then form a loop, have the potential to worsen hum and noise, here acting as single turn windings into which noise may be induced. The dynamic and timing musicality is dependant on avoiding loops. This matters more than niceties of cable type. A single central audio ground runs from the Superline through the power supply and then out to the signal cable. DIN sockets are preferred for their single grounding. Separated RCA connections almost guarantee a loop. Link stereo cable pairs together with ties to minimise a loop.
Also heavy duty audio cables may conduct vibration between units and lighter duty , thinner more compliant cables may sound better in this position .

Martin Colloms
Offline patsuh  
#5 Posted : 30 May 2020 05:03:29(UTC)
patsuh


Rank: HIFI Newbie

Joined: 28/09/2010(UTC)
Posts: 9
Dominican Republic
Location: dominican republic

Thanks: 1 times
Originally Posted by: Martin Colloms Go to Quoted Post
Hi Martin:
we always believe about your thoughts and findings as the best in audio
business, being honest we bought those naim products based on this.
perhaps, our only concern is why naim phono stage have their inputs in the unit and outputs in the power supply?
in terms of audio quality it has to suffer and the cable itself it looks pretty ordinary nothing special,
then it doesn’t make sense to use a high quality interconnects between the Naim power supply and my preamplifier
we are using cardas golden reference but thinking of
getting a pr of transparent reference gen5 instead.
can you explain me why this?

MC >>> A foundation of NAIM design practice is hierarchical grounding where the more delicate and sensitive sections , in this case the phono stage, begin the ground path, then on to the local power supply , then to the preamp and then to the power amp. Ground loops , e.g. more than one ground (power supply and/or signal) from one section to another, which then form a loop, have the potential to worsen hum and noise, here acting as single turn windings into which noise may be induced. The dynamic and timing musicality is dependant on avoiding loops. This matters more than niceties of cable type. A single central audio ground runs from the Superline through the power supply and then out to the signal cable. DIN sockets are preferred for their single grounding. Separated RCA connections almost guarantee a loop. Link stereo cable pairs together with ties to minimise a loop.
Also heavy duty audio cables may conduct vibration between units and lighter duty , thinner more compliant cables may sound better in this position .

Martin Colloms


Hi Martin:
We learn more with your thoughts, always extremely good, we use another brand for preamp ( VTL 5.5 series II tube preamp, can you recommend us a cable with Dini inputs and rca output which works extremely well with this sytem?


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