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Old 16th September 2011, 05:55 PM   #1991
Jogi is offline Jogi  Germany
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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.
Maybe you could try to get your voltage down by lowering the first filter cap to something around or below 1µF. This drops the voltage significantly, and gets more of a choke input characteristic. And simultaniously to put in a second choke after the second cap instead of the big resistor; perhaps you can lower the value of the caps then and use good PIO or film caps instead. The "last" cap of the supply is the most important sonically.
This should give a significant improvement in dynamics and "flow", as you don't burn energy in the resistor anymore and the whole supply becomes faster.
I always use cheap inductors from old radios for testing, they can be quite goo as they knew how to wind these properly back in the 40ies/50ies.


And for the WE274A: Sadly I am not a German dentist

Last edited by Jogi; 16th September 2011 at 05:57 PM.
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Old 16th September 2011, 06:02 PM   #1992
Salas is offline Salas  Greece
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Originally Posted by dvb-projekt View Post
One thing is clear, that 5UC3 Black Plate stays

This rectifier was the biggest SQ step i've ever made !
It looks like the bigger plates you use the better it goes for you subjectively. There is much difference between 5Y3WGT and 5U4GB in current spec. Tubes were not made with CCS draw in mind, they will behave and get old in a different manner than usual.
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Old 16th September 2011, 06:04 PM   #1993
Salas is offline Salas  Greece
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Originally Posted by Jogi View Post


And for the WE274A: Sadly I am not a German dentist
That's a lampizator's punch line? The Shuguang ain't a bad copy for the money BTW.
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Old 16th September 2011, 07:00 PM   #1994
Jogi is offline Jogi  Germany
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Yup, I liked that quote a lot, since I have the equivalent of several 274A built in orally.
My Dentist stopped working at the age of 48 btw Something must be wrong...
Anyway, I have some of the Shuguangs, but they collect dust.
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Old 16th September 2011, 07:29 PM   #1995
Salas is offline Salas  Greece
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Having a WWII AZ1 mesh plate I would not bother myself substituting untill it expires.
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Old 16th September 2011, 07:54 PM   #1996
Jogi is offline Jogi  Germany
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Thatas exactly what I'm doing; although to my surprise I prefer the solid plate, better bass and more coherent, less treble extension though. But the meshies are so nice to look at, piece of art: Jimmy’s Junkyard 2011 February
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Old 17th September 2011, 03:10 AM   #1997
regal is offline regal  United States
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Quote:
Originally Posted by Jogi View Post
Maybe you could try to get your voltage down by lowering the first filter cap to something around or below 1µF. This drops the voltage significantly, and gets more of a choke input characteristic. And simultaniously to put in a second choke after the second cap instead of the big resistor; perhaps you can lower the value of the caps then and use good PIO or film caps instead. The "last" cap of the supply is the most important sonically.
This should give a significant improvement in dynamics and "flow", as you don't burn energy in the resistor anymore and the whole supply becomes faster.
I always use cheap inductors from old radios for testing, they can be quite goo as they knew how to wind these properly back in the 40ies/50ies.


And for the WE274A: Sadly I am not a German dentist
For the last cap (zobel) I did swap to the russian K75 bypased with the russian teflon, big improvement.

Haven't given the prefilter much thought, butI do still measure a bump at 120hz (also 60, 180 and 300), all under -100db. I assumed grounding causing this, but maybe your suggestions would improve this. Thanks
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Old 18th September 2011, 01:14 PM   #1998
tim845 is offline tim845  Hong Kong
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Any body had tried the very first version and the latest version yet? How is the comparison?

My version is the very first one, but I found myself seems to be lazy to dismantle it for the latest one.......
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Old 18th September 2011, 02:53 PM   #1999
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What about the quality of AZ1 Siemens?
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Old 18th September 2011, 07:28 PM   #2000
Stixx is offline Stixx  Germany
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Quote:
Any body had tried the very first version and the latest version yet? How is the comparison?
My version is the very first one, but I found myself seems to be lazy to dismantle it for the latest one.......
When you mean the different versions of the SSHV reg I pretty much answered that in post 1951. Although
the improvement to my ears is more due to the better parts quality, esp. the caps as discussed in this thread before.
I did not compare both versions with the exact same parts so its hard to say.
When I was you I would play with the Vref cap and the Zobel cap... a very worthwhile field for experiments.
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