and now for something completely different part 3

[audiostar]

What about mono blocks, putting both differential halves per channel in their own case on the left/right heatsink. This will give more space on the heatsinks for more transistors and more room in the mid of the case for a proper PSU.

[kevin gilmore]

its still 2 boxes. but sure if you want to build it that way.

[dip16amp]

Found a new ADC & DAC device for testing my CFA2 amps with RMAA.
The RME ADI-2 PRO FS R Black Edition has a recent price drop to $1699.
Here it is testing one foot XLR balanced cables.
It is much better than my older Benchmark ADC1 & DAC2.
I'll test my CFA2 dual balanced mono amps soon.

 

RightMark Audio Analyzer test _ RME ADI-2 Pro.pdf

[dip16amp]

Tested my balanced dynalo with the rme adi-2 pro today.

The balanced dynalo is built on dip 16 sockets in 2004.

Loos like the price drop of the rme adi-2 pro fs r be was only for 1 week, now it is $1999.

 

RightMark Audio Analyzer test _ dynalo RME ADI-2 Pro.pdf

[RudeWolf]

What did you load the Dynalo with? I find that 30/300 Ohm loads work nice and you need to come up with a voltage target that's relevant for headphones.

P.S. Am I the only one who can't download these reports? My browser just loads for a little bit and then nothing, the download doesn't start.

[audiostar]

1 minute ago, RudeWolf said:

P.S. Am I the only one who can't download these reports? My browser just loads for a little bit and then nothing, the download doesn't start.

Just tried and same for me.

[jamesmking]

1 minute ago, RudeWolf said:

What did you load the Dynalo with? I find that 30/300 Ohm loads work nice and you need to come up with a voltage target that's relevant for headphones.

P.S. Am I the only one who can't download these reports? My browser just loads for a little bit and then nothing, the download doesn't start.

Im using windows and chrome. I right click on the download, select open in new window and then hit enter in the url of that new window to download....

 

[audiostar]

Ok, right-click and then "save as" works, but then the file needs to be renamed to .pdf in order to be able to open it. Chrome saves it on macos as undefined. Must be something with the formatting thats wrong.

[jamesmking]

28 minutes ago, audiostar said:

Ok, right-click and then "save as" works, but then the file needs to be renamed to .pdf in order to be able to open it. Chrome saves it on macos as undefined. Must be something with the formatting thats wrong.

on windows chrome saves with correct extension....

[dip16amp]

4 hours ago, RudeWolf said:

What did you load the Dynalo with? I find that 30/300 Ohm loads work nice and you need to come up with a voltage target that's relevant for headphones.

P.S. Am I the only one who can't download these reports? My browser just loads for a little bit and then nothing, the download doesn't start.

These are just balanced XLR cables in and XLR cables out of the dynalo. No added loads.

I'll look into adding loads.

 

[dip16amp]

Here is the balanced Dynalo with 220 ohm loads RMAA test with RME ADI-2 PRO.

Signals levels set to RMAA test levels as before.

 

RightMark Audio Analyzer test _ 220dynalo RME ADI-2 Pro.pdf

[JoaMat]

On 11/26/2022 at 1:02 AM, JoaMat said:

Some progress with Tube Hybrid(something).

 
PSU; left – Board with filament transformer and transformer for GRHV style regulator (+100V). To the right is Connex SMPS, put it in top of the first board and you have PSU with 6.3VAC, +100VDC and +/-30VDC.

Amplifier board with a tube daughter board. The required -5V is done on the amplifier board with a smd 7905 and a few capacitors.

Will it work? Who knows?

The answer is No. It doesn’t work.

The bottom line is I’ve big trouble get it working. So, I'll put my version of a Tube Hybrid on hold. Probably for a looong time.

[dip16amp]

Here is a RMAA comparison of my full balanced Dynahi and full balanced CFA2.

 

RightMark Audio Analyzer test_ comparison.pdf

[dip16amp]

Here is the full balanced Dynahi RMAA.

 

RightMark Audio Analyzer test _ 48 DYNAHI Benchmark DAC2 ADC1.pdf

[dip16amp]

Here is the full balanced CFA2 RMAA.

RightMark Audio Analyzer test _ 48K CFA2 RME ADI-2 Pro.pdf

[RudeWolf]

Is this self-oscillation?

[dip16amp]

That was without the steel covers.

When I put the covers on, it looks like this:

 

[audiostar]

The resolution of these measurements look mind blowing precise down to 5 digits. Being able to tell the difference between lid open and lid closed is no joke. 

Have you ever compared your setup measurements with any other pro gear? Just wondering how really accurate and repeatable those are. 

[dip16amp]

I should test my Benchmark HPA4 or AHB2 on the RME.

 

[dip16amp]

Here is the HPA4 & RME RMAA.

 

RightMark Audio Analyzer test _ HPA4 RME ADI-2 Pro 48.pdf

[audiostar]

On 11/29/2022 at 5:58 PM, kevin gilmore said:

the idea is to drive jbl m2's with the amplification they deserve. not a pair of crown industrial amps.

Kevin, did you switch to M2's? No Wilsons anymore?

[kevin gilmore]

m2's owned by someone else. too big for my room.

 

[audiostar]

41 minutes ago, kevin gilmore said:

m2's owned by someone else. too big for my room.

I see

Is there a final version for the boards? 

[kevin gilmore]

here you go

 

cfp3largeT.ZIP

[migo]

On 1/10/2023 at 11:29 PM, dip16amp said:

I should test my Benchmark HPA4 or AHB2 on the RME.

 

Can you measure AHB2 too please?