Builders got about 15dB. Nelson appears to sum top andbottomportion of PP Fe. Dont know why, and if you did the same to F5, you woyld find they are back to being similar again, in this respect. Iam more than happy to talkabout it in the BA3 thread.
We want to see the goods. Where is the pic of the top? Have you listened on main system more?
ok, lets stick to that 😉
maybe because in BA-3 FE the signal is summed into one, like a preamp (F5 jfets are not)
Tinitus,
Go to the BA3 thread. Look up Generg. He specifically addresses the issue after building his. You are probably right and I am wrong. What you say makes sense. Shows my ignorance. I concede.
Bas,
On my end, it is saying the video is private.
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thanks for that redirect 🙂
seems the guys worked it out, in the end, 30db, and what the boss said (Nelson😀)
cheers
Basman,
WRT the noise you're experiencing... could it be your smallish choke is hitting saturation? Cuz your first cap is only 2uF (from memory) the PS behaves like a choke-in filter. Loading thoose 150uF pulls lots of current...
Perhaps you can experiment with a resistor of equal resistance in parallel with the choke to see what happen at half the power? Or replace it altogether 😉
WRT the noise you're experiencing... could it be your smallish choke is hitting saturation? Cuz your first cap is only 2uF (from memory) the PS behaves like a choke-in filter. Loading thoose 150uF pulls lots of current...
Perhaps you can experiment with a resistor of equal resistance in parallel with the choke to see what happen at half the power? Or replace it altogether 😉
Discoman,
The choke is per channel. So about half of it's current is drawn. Should be ok?
Btw the noise is actually not so bad. It sounds like white noise. Soft white noise...Not audible from my listening spot. Still. Not something I expected.
The choke is per channel. So about half of it's current is drawn. Should be ok?
Btw the noise is actually not so bad. It sounds like white noise. Soft white noise...Not audible from my listening spot. Still. Not something I expected.
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Currents can be examined in PSUD, of cause. I'd suspect those mini chokes for the reason I gave. 40mA is for AC and DC current simultaniously -and besides, they suck. 😉
All the best!
All the best!
Choke in general? Or the ones I have?
I'll try Salas's suggestion first. Replace grid stopper carbon film with metal film.
OK, but grid stoppers should ideally be neither magnetic nor reactive.
Chokes are all right if used within current range. I suspect that's going wrong here.
Chokes are all right if used within current range. I suspect that's going wrong here.
I'll try without 😉
Maybe it's not the linestage at all. Since I can't hear the noise with headphones or on my computer room system.
I've been used to playing directly from my DAC to power amp. (Volume control digitally via my Squeezebox Touch)
Perhaps the gain of the preamp is now making the DAC (6N6P output stage) white noise audible?
An estimate:
An externally hosted image should be here but it was not working when we last tested it.
without the 2uF:
An externally hosted image should be here but it was not working when we last tested it.
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Very likely. Not getting it on headphones is a strong hint it may be a push to source hiss. If you can FFT the chain rings you would see exactly. Are the big system's speakers highish sensitivity or horn even? Multiways with dedicated HF units?