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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: Please stop (nt) posted by sony6060 on February 1, 2015 at 11:25:14:
My power amps are PPP differential IT and OT transformer coupled. Input stage is a 6SN7 LTP, current source tail with a CT plate choke load direct coupled to a 6BX7 LTP, CCS tail loaded by the primary of the IT. 3:1 step-down to four KT120s that operate as a LTP with CCS tail. Original PS configured as LC (output stage), LCRC (driver), LCRC-CCS feeding a shunt resistor (input B+ developed by the amount of current shunted) bypassed with a cap (input).
I first replaced the shunt resistor with an active shunt reg. (120V, modified Salas design). NIce improvement in sound. Next I added a CCS fed shunt reg. to the driver stage (434V, modified Salas design). More improvement in sound quality. These were not subtle changes but very noticeable.
Trying to shunt reg. the output stage at 600V and 300mA proved too challenging. :~) (see photo)
Everything in my system, input to output, is PP differential: phono stage, line stage, and power amps. I added individual CCS fed shunt reg. to every gain stage except the power amps output stage, in all eleven total shunt reg. supplies. For every one that I added there was a noticeable increase in sound quality.
Needless to say, I am a big fan.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
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Follow Ups
- my experience with shunt reg. - JKT 02/1/1512:09:02 02/1/15 (1)
- RE: my experience with shunt reg. - sony6060 12:24:10 02/1/15 (0)
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