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Old 16th September 2011, 12:19 PM   #1981
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Besides the cap testing, i had ordered 4 Mundorf Supreme 1F,
i made some unexpected experiances with tube rectifier rolling.

Click the image to open in full size.

More in my blog.


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Old 16th September 2011, 12:27 PM   #1982
Salas is offline Salas  Greece
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JAN CRC 5R4GY did you ever try?
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Old 16th September 2011, 01:50 PM   #1983
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No, only the 3 i have here. In the meantime i have listen to some tracks like:

Santana - Milagro
Kenny Loggins - Outside: From the Redwoods (live)
Oscar Peterson Trio - We get requests
Peter Gabriel - So (Remastered)
Sara K. - Water Falls
Simple Minds - Street Fighting Years

I really dont know what happened... Whatever i play,

I never ever heard my rig sound that good !

Not with the Discrete Diamond Non-Feetback I/V stage from Pedja Rogic nor with -ecdesigns- MK7 I/V stage.

I only change that damn tube rectifier for the HV of the Tube-I-zator. I am absolute speachless.

Unbeleavable
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Old 16th September 2011, 03:41 PM   #1984
regal is offline regal  United States
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Quote:
Originally Posted by dvb-projekt View Post

I only change that damn tube rectifier for the HV of the Tube-I-zator. I am absolute speachless.

Unbeleavable
Do you mean in concert with the SSHV? I am surprised the rectifier tube choice has much influence?
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Old 16th September 2011, 03:51 PM   #1985
Jogi is offline Jogi  Germany
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Yes it still has big influence, whysoever. I much prefer tube rectification over SS, and from the tube rectifiers the best I tried was the venerable old AZ1, as I don't need more than 80ma current. But the AZ1 has 4V filament supply, which can be a problem with existing transformers. And it has funny sockets, too.
The RCA 5AR4GY Salas mentioned is the best from the bigger rectifiers to my ears.
And film caps in the power supply do noticable better than electrolytics, and the quality of the choke, if used, is clearly audible. All this with the shunt...
Its fun to try all these different choices..

cheers,

Juergen
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Old 16th September 2011, 03:52 PM   #1986
Salas is offline Salas  Greece
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Each tube rectifier changes the impedance before the CCS loop, they are much different between them than modern diode bridges. Before passive filter PSUs they are much more influential even.
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Old 16th September 2011, 03:55 PM   #1987
Salas is offline Salas  Greece
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Quote:
Originally Posted by Jogi View Post
Yes it still has big influence, whysoever. I much prefer tube rectification over SS, and from the tube rectifiers the best I tried was the venerable old AZ1, as I don't need more than 80ma current. But the AZ1 has 4V filament supply, which can be a problem with existing transformers. And it has funny sockets, too.
The RCA 5AR4GY Salas mentioned is the best from the bigger rectifiers to my ears.
And film caps in the power supply do noticable better than electrolytics, and the quality of the choke, if used, is clearly audible. All this with the shunt...
Its fun to try all these different choices..

cheers,

Juergen
A choke input WE274B is nice also.
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Old 16th September 2011, 04:08 PM   #1988
regal is offline regal  United States
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Quote:
Originally Posted by Salas View Post
Each tube rectifier changes the impedance before the CCS loop, they are much different between them than modern diode bridges. Before passive filter PSUs they are much more influential even.
I understand, but my prefilter CLCRC has a huge R value simply because I needed to a lot of drop voltage to use the transformers I had on hand, obviously this made the prefilter "output impedance" quite large and I thought you said earlier this wouldn't hurt as the SSHV ultimately gives a the very low output impedance regardless of its feed. That is why I am surprised that the rectifier is influencing the sound.
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Old 16th September 2011, 04:23 PM   #1989
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Quote:
Originally Posted by regal View Post
Do you mean in concert with the SSHV? I am surprised the rectifier tube choice has much influence?
As you perhaps see in my blog, i use only Mundorf film caps in my psu.

3,9uF Supreme silver/oil - 10H amorph choke - 47uF TubeCap - 100R - 100uF TubeCap

Perhaps that part choice is is able to show the sound differences between the tube rectifier better than electrolytics.

One thing is clear, that 5UC3 Black Plate stays

This rectifier was the biggest SQ step i've ever made !
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Last edited by dvb projekt; 16th September 2011 at 04:31 PM.
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Old 16th September 2011, 04:37 PM   #1990
Salas is offline Salas  Greece
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Quote:
Originally Posted by regal View Post
I understand, but my prefilter CLCRC has a huge R value simply because I needed to a lot of drop voltage to use the transformers I had on hand, obviously this made the prefilter "output impedance" quite large and I thought you said earlier this wouldn't hurt as the SSHV ultimately gives a the very low output impedance regardless of its feed. That is why I am surprised that the rectifier is influencing the sound.
It does not have to do with the impedance of the output loop, and won't hurt that aspect. Each rectifier type along with the filtering scheme chosen will deliver the current asked by the CCS in different efficiency and high order byproducts. They had been much less obvious than in fully passive, still they could be picked in my initial tests. More so if with Maida series reg. Soft recovery diode bridges were less differentiating subjectively by type, and had better bass. The tube rectifiers could be more pleasant, maybe less honest though.
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