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Old 15th November 2012, 04:20 PM   #3431
Salas is offline Salas  Greece
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Quote:
Originally Posted by king4joy View Post
Salas...if you remember, with your help, I have added a SSHV2 to my CCS (C4S) loaded VT-25A line amp. Adding the SSHV2, all hums are gone....however, a light zzzzzssssszzzz....takes over....(which I can live with, although my friends cannot....)....I think this could be because of old tubes.....Salas, what you think??
And with the SSHV2 added, I feel that the music has become a bit restricted...less lively....less fluid.....what I think is I should get rid of the C4S, and instead going back to use resistors to load my tube with your SSHV2.....with a good quality resistor after your board, it should act like a CCS anyway, with the added avdvantage of setting the loading current (voltage across the resistor) easily with your board......
Your board opens up opportunities for me to fine tune my amp with much less fuss and more joys.
Will report back further later....thankyou....
zzzz means you gotta sort out some small ground loop somewhere or some tube problem that surfaced better after the hum blanket has gone.
Try the resistor indeed.
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Old 15th November 2012, 04:22 PM   #3432
Salas is offline Salas  Greece
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Quote:
Originally Posted by CSlee View Post
OK, I think there is still room for improvement so I will look at the layout etc.

I thought it is worth trying out better regulated supplies on classic valve compressors, why should you hifi guys have all the fun!

Hopefully getting some studio time this week so I will report it's performance.

Thanks
Photos from the compressor in the studio would be nice!
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Old 15th November 2012, 05:21 PM   #3433
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Quote:
Originally Posted by CSlee View Post
Yes, I think I was just expecting to see an improvement. It is clear that the previous PS was good enough for the circuit with respect to ripple. I will try to improve on the -80dB by changing the layout.
There may be improvement in sound quality, while there is no improvement in measured SNR. Measured SNR isn't all that affects sound quality.
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Old 15th November 2012, 05:25 PM   #3434
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Yes I understand that, thanks. I wonder whether it is worth reworking it or settling for the noise as is. If it isn't noticable in the studio then maybe I will leave it.
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Old 15th November 2012, 05:47 PM   #3435
Salas is offline Salas  Greece
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Input stage tubes usually affect the noise floor the most, given a design. There can be several dB differences between batches and brands and select groups for the same type. Also susceptibility to heaters effects and their PSU feeds.
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Old 15th November 2012, 11:27 PM   #3436
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Originally Posted by Salas View Post
zzzz means you gotta sort out some small ground loop somewhere or some tube problem that surfaced better after the hum blanket has gone.
Try the resistor indeed.
With resistors loading the tubes, do you think it is better to use 2 SSHV2 boards??
My PSU box only has space for one SSHV2 board....what would be the best way to connect the 2 resistors please??....I am sure you always have something up your sleeves....
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Old 15th November 2012, 11:39 PM   #3437
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Would replacing the cathode resistors with LED have anything to do with the zzzz (insects like) sound???
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Old 16th November 2012, 08:38 AM   #3438
Salas is offline Salas  Greece
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Open a thread in tubes forum showing the circuit diagram and revealing photos of the build. Explaining what you need to sort out. There many can inspect and investigate/contribute. I will look into it too. Its much more of a topic than a PSU matter alone.
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Old 16th November 2012, 12:37 PM   #3439
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Originally Posted by Salas View Post
Open a thread in tubes forum showing the circuit diagram and revealing photos of the build. Explaining what you need to sort out. There many can inspect and investigate/contribute. I will look into it too. Its much more of a topic than a PSU matter alone.
Strange as it may sound....I will need you to walk me through as how to open a thread......

I welcome your thoughts the most.....
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Old 16th November 2012, 12:45 PM   #3440
vgeorge is online now vgeorge  Greece
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Go to the tubes/valves directory and on forum tools choose post a new thread.
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