Fortunately I found these 10nF 2000V🙂
I'm also interested about the virtual GND connexion.
Those might be good to bypass the shunt´s output zobel cap (only bypass the cap ... not the zobel)
Of course you use much better film caps there than myself so it might not sound the same... In my case a 10nF // 4u7 on the output zobel enhances mids and highs.
10pF // 4u7 only affects the extreme high freq.
Of course you use much better film caps there than myself so it might not sound the same... In my case a 10nF // 4u7 on the output zobel enhances mids and highs.
10pF // 4u7 only affects the extreme high freq.
System grounding is a specific, takes analysis & experimentation. Most usually the TT ground tail goes to chassis.
I'm using V1.2R regs & I have installed time ago 0.1uF teflon FT-3 in parallel with C1 & I like it so don't change, finally I decided to lower the VTF to 2.3 or 2.4gr depending recording. As I understood C3 can't be bypassed or yes with 10nF?
That is what I did.... Just bypass C3 with a smaller MKP cap.
You should NOT bypass the complete zobel or the output EL cap.
What type and value of C3 are you using ?
You should NOT bypass the complete zobel or the output EL cap.
What type and value of C3 are you using ?
Is it dangerous to lift the preamp -V from chassis/Earth ?
I experimented with a 10r and 100r.... 100r is better, lowering 50hz hum. I was wondering about too paralelled (oposing ends) rectifier diodes... Can this damage anything ?
Yin Yang they call them some times. No, you can't damage. If you got some equipment that hum when hooked up in a system and some that don't, its a complex issue, there are many threads on system grounding if you search the forum, and articles on the web. Usually its a loop through interconnect shields and mains ground returns, some times solved in the power amp with that diode bridge fail safe lift. It transcends the phono, its a general issue. My builds are fully grounded to chassis with mains earth attached too for instance. They never hummed in the few different systems I hooked them up by now.
Thank you Salas
I know the issue transcends the phono. My preamp has different inputs and depending on the input used, I sometimes get hum.
Using a "cheater" plug I completely eliminated hum because the loop closes in the mains earth wiring.
I will experiment lifting the phono -V with the Yin Yang diodes and report.
I know the issue transcends the phono. My preamp has different inputs and depending on the input used, I sometimes get hum.
Using a "cheater" plug I completely eliminated hum because the loop closes in the mains earth wiring.
I will experiment lifting the phono -V with the Yin Yang diodes and report.
Last edited:
Ok... perfect... Just experiment with a 10nF bypassing ONLY C3.
Let us know your subjective impressions.... I used MKP 1837 with very good results.
Let us know your subjective impressions.... I used MKP 1837 with very good results.
I also tryed an Auricap there and it also works wonders, leaving the auricap full sound and adding some fine trebble subtleties.
Yes I used the combo Auricap+FT-3 in Salas High Voltage Shunt Regulator with very good success.
I solved the slight hum by rerouting the TX cables inside the case.
Lifting -V is detrimental... I can distinctly hear better bass with -V connected to mains Earth and it does not improve hum at all.
Also experimented with a filtered mains inlet and it provides a lower noise floor but somehow mutes the highs. If I needed to use the filter, I probably would need to retune the shunts.
I would like to try this balanced mains filter from Ray´s site: http://www.raylectronics.nl/index_en.html
Another day, another lesson 🙂
Lifting -V is detrimental... I can distinctly hear better bass with -V connected to mains Earth and it does not improve hum at all.
Also experimented with a filtered mains inlet and it provides a lower noise floor but somehow mutes the highs. If I needed to use the filter, I probably would need to retune the shunts.
I would like to try this balanced mains filter from Ray´s site: http://www.raylectronics.nl/index_en.html
Another day, another lesson 🙂
Last edited: