New Audio-gd R-7, R-7HE R-8, R-27, R-27HE, R-28 Flagship Resistor Ladder DACs and DAC/amps

[dougms3]

This looks like them..

https://talema.com/products/low-profile-pcb-mount-toroidal-transformers/

My mistake, I should have known better than to question Fred

 

[FredA]

This looks like them..

https://talema.com/products/low-profile-pcb-mount-toroidal-transformers/

Yep. It is a 15VA unit (2x7.5).

 

[FredA]

It's still odd, since on the 1st version of the clock the website says "linear power supply" but on the 2nd version it doesn't say that.

Whoever is in contact with Alvin/Vinshine might ask for a clarification on the PSU section and suggest maybe the website could be updated.

Still a linear psu, don’t worry.

 

[Jake2]

Well will you look at what turned up on the doorstep this arvo...

Yes, not quite the OCK-2 but its close relation the SW-8 in the same chassis and also sporting a Talema toroidal. It's beautifully built and weighty for its size. A bit of Jay's design trickle down starting to happen. Alas aesthetically it puts the OCK-1 in the shade and is a rather better match for its bigger brother. Hmm, what to do eh...?

I started to remove the base plate then paused as a friable assembly sticker is over one of the screws. I've seen photos of the interior already but there's nothing like doing so in the real eh? Will likely do so later once I confirm it works.

Edit- I realise this going even further off topic so can move elsewhere if need be... maybe the Master Clock thread.

 

[bodiebill2]

I still find it confusing. If you look at the connector differences, 50 vs 75 Ohm, not only the dielectric (the white plastic material) is different, but also the size of the pin.
Somewhere I read that a 75 Ohm cable does not snugly fit on a 50 Ohm connector and vice versa. So what if I order the OCK-2 as 75 Ohm and the connectors remain as they are (50 Ohm)?

Alvin of Beatechnik explained that the OCK-2 BNC Connector is actually designed for 75Ω but compatible for 50Ω applications.

 

[gimmeheadroom]

Alvin of Beatechnik explained that the OCK-2 BNC Connector is actually designed for 75Ω but compatible for 50Ω applications.

Hilarious, now I have seen it all

 

[DACLadder]

Alvin of Beatechnik explained that the OCK-2 BNC Connector is actually designed for 75Ω but compatible for 50Ω applications.

What are the default impedance jumpers set to inside the OCK-2? Thinking they may default 75 ohm from above comment. Are the instructions clear on how to set the impedance switches? I think the OCK-1 is 50 ohm default.

Really liking the OCK-1. The HE7 mk2 has tremendous bass when compared with the Mutec Ref 10. Tonally thick and juicy. Historically on Kingwa's DACs lower jitter provides better bass among other benefits (staging, depth, vocals, etc).

I found this on OCK-2 jumpers. Impedance select plus GND/ Isolation switching,

 

[PeterCraig]

The default is 50 ohm per the Gzbotolave Aliexpress seller.

I noticed free shipping isn't included anymore on his store. It seemed a bit generous to include free DHL shipping.

 

[OCC7N]

Buying the R8HE mk2 I should get 75Ohm clock input right?

 

[gimmeheadroom]

Buying the R8HE mk2 I should get 75Ohm clock input right?

It depends on the rest of your system. Seems like any hifi gear lately that needs a 10 MHz clock is using 50 ohm, while all pro gear since the 1980s uses 75.

 

[bodiebill2]

Buying the R8HE mk2 I should get 75Ohm clock input right?

Correct if you mean clock output, as the R8HE Mk2's BNC connection is 75 Ohm.

 

[OCC7N]

Correct if you mean clock output, as the R8HE Mk2's BNC connection is 75 Ohm.

Afaik the connector is 50(native) if I decide to use 75 a change needs to be done.

Well Im not as patient as I thought I was, so I want it to work with my matrix spdif2 to start with(i2s)…later on DI20HE.

Its just that everywhere I look I see 75Ohm more than I see 50. Specially cables.

 

[OCC7N]

I see this on the matrix spdif2 manual and trying to figure what it means regarding the connection i2s to the r8he mk2

 

[bodiebill2]

Afaik the connector is 50(native) if I decide to use 75 a change needs to be done.

Well Im not as patient as I thought I was, so I want it to work with my matrix spdif2 to start with(i2s)…later on DI20HE.

Its just that everywhere I look I see 75Ohm more than I see 50. Specially cables.

To be precise (according to Alvin): the physical connector is 75 Ohm but compatible with 50 Ohm. The default setting inside (dip switches controlling the resistors) is 50 Ohm but can easily be switched to 75 Ohm. If you do not want to open the case, you can ask the seller to do that before shipping. However I see it as a benefit that a connector' impedance can be changed when (in my case) a 50 Ohm device is added.

 

[gimmeheadroom]

Afaik the connector is 50(native) if I decide to use 75 a change needs to be done.

Yeah this is just bizarre. It's bad enough that lately hifi gear has gone with 50 ohms. But mix and match connectors and impedance from Audio-gd? It seems incredible

Its just that everywhere I look I see 75Ohm more than I see 50. Specially cables.

Yep, 75 ohm digital interconnects started in the 1980s and go to this very day. There are zillions of cables, adapters, fittings, etc. and devices!

I have no idea who the genius was that decided to go with 50 ohm clock setups.