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In the Forum: Analog Playback
In the Thread: The last phonocorrector: “End of Life" Phonostage
Post Subject: A few comments.Posted by Romy the Cat on: 9/1/2011
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1)      Be very careful with use Halco resistors. They were very good 15 years back but they turned south very aggressively. I bought a party of Halco in 2005 and I forced myself to trashed them as they were very noisy. You do not use then in critical location, still I would be very watchful with them.

2)      I do not know about the SS stabilizers in filament supply. Why do you need them? Chokes stabilize current well and if you have some voltage jump then .1-.-2V on filament would not do any deferments.  None of the stabilizers that I heard sound as good as no stabilizers. I have made a very good tube and ultra fast stabilizers on tube but it was not as good as no stabilizers. I truly do not see use of them if they are not necessary.

3)      The common mode filter you have at the PS’s input- why do you use them? They do eat some dynamics. As many time I removed them from all imaginary components as many time I witnessed better sound.

4)      The values of the air caps. Stick to 330p and 110pF BUT it would be depends from your mounting of the caps, the assembly techniques and so on. Do not be afraid if you need to change the values for +/- 5%-10% in YOUR case. What you need to do. After you will be done, take YOUR cartridge with your typical load for that cartridge and play frequency sweep record into a RTA with resolution of .25dB. Then adjust the value of your caps. You might use a tested inverted RIAA filter and run the sweep from CD player. I still fill that you will end up with 330/110pF but it might be 335pF and 105pF as well.

The real wet dream of mine, something that I would like to have but never went for is to have in the axis of the air caps a high precision step motor and a remote control that would allow me to modify the phono equalization based upon the given label, vintage and pressing.  I would like to note that it would be absolutely problem free EQ, I just never had a chance to do…

Rgs, Romy the Cat

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