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preamp for BA-3
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Old 19th May 2020, 03:42 PM   #1
diyiggy is offline diyiggy
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Default preamp for BA-3

Hello,

I was advised the BA-3 amp as Nelson Pass amps introduction because I have low sensivity 3W speakers: 85/87 dB sensivity with loads from less than 3 ohms to 8 ohms. Have also loudspeakers with 4 ohms load rated relativly flat with no hard or steep break in the phase curve but full of drivers to drive nearer than 90 db sensivity starving for curent and my very simple understanding as no tech background is the more V*A=Watts, the better.

Before this advice I lurked about something not too much expensive introducing the SET sound without the hassle and my likings push me more to want learn about SS than tubes. So I thought about SIT/Vfet, alas F5 and BA-3 were said to be more realistic due to the load of my speakers . -But BA-3 or F5 still Ferraris, not the Aleph J, VFet2/Sit 250 GTO but at least a Ferrari yet -

Sorry for the long introduction of it, my question please is about not to ruin the BA-3 (and any FW NP designs) due to the volume control/preamp I could marry to it. I do not playback vynils and my DAC has no electronic digital volume control, so "good"volume control is mandatory.

What about a Muses control Kit for instance with or w/o Korg nutube kit to have a flavor of SET sound as the Aleph J or SIT/Vfet 2 are not advised with low efficienty classic speakers ?

My interest could be one day to use it in an active amps conf. My ref amp today is a nuclear central though has clarity : A Chord amp from the early 90s with sorted outputt Mosfet, SMPS powered- 200 W 8 ohms. So I have control but certainly no refinment.

Many thanks in advance for each of your answers, links.
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Old 19th May 2020, 04:34 PM   #2
Zen Mod is offline Zen Mod  Serbia
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preamp for BA-3
study BA3

with or without preamp based sugar, you can dial it (BA3) to your liking, once you grasp how to decode THD Spectra (decent sound card and few progs plus few resistors for attenuator)

logically, build BA3 , then build form that

of course , when you read recommendation for BA3, you were aware of fact that we were talking about ability to drive tougher loads, while - basically, with +/-24Vdc rails , you still have 25W/8R , and 50W/4R

do your homework and think - is it 50W enough for your needs....... , that's necessary starting point

with higher rails and accordingly set Iq ( thinkong of dissipation per device etc.) you can get higher output power, though everything must be well thought , starting backwards - preferred power, number of outputs in OS, rails, then cap banks, then VA of Donuts, then case(s)

it is Legoland if you don't want basic,, without straying from well known ...... when you want to improvise and stray out, be prepared to buy few bigger Lego packages and combine them

in any way, we are here to help ........ (and me, mostly to amuse and abuse and confuse )
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Old 19th May 2020, 04:39 PM   #3
diyiggy is offline diyiggy
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Thanks Zen Mod,

The complicate thing to understand with my limitd nowledge is how a loudspeaker tower is asking during transcients and sudden high spl playbacks. AT the average relativly low domestic spl volume I listen to, most of amplifiers are ok, while the weaker will distorss cause nearer from their limits I assume... I'm more woried by possible clipping due to bad marriage

I will google about that, yah !

Edit : I was a Lego fan as a kid... oh and always is

Last edited by diyiggy; 19th May 2020 at 04:42 PM.
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Old 19th May 2020, 04:44 PM   #4
TungstenAudio is offline TungstenAudio  United States
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Is is really necessary to put the CV-19 stuff in your signature?

I, for one, come here for a pleasant diversion from the 24/7 coverage and fear-mongering that is readily available everywhere else.
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Old 19th May 2020, 04:51 PM   #5
Dennis Hui is offline Dennis Hui  Canada
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preamp for BA-3
diyiggy,

It might be fun to try this to get an idea how much power/voltage swing
you are currently using:

A Test. How much Voltage (power) do your speakers need?
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Old 19th May 2020, 04:58 PM   #6
diyiggy is offline diyiggy
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Edit, thanks Dennis, I almsost forgett to thank you due to the post before yours. I'm going to read, thanks.





Quote:
Originally Posted by TungstenAudio View Post
Is is really necessary to put the CV-19 stuff in your signature?

I, for one, come here for a pleasant diversion from the 24/7 coverage and fear-mongering that is readily available everywhere else.

Uh... 2 answers for that : it comes from the time people were not so informed. Second, if ocasional reader (not necesarily from your State/country falls on it and it can save only one life, I hesitate to supress it for the moment.... oh a third, some may still think it's not real being in deny yet (and eventually don't think to others in their dementia).
So no diversion, don't be paranoid please. But if a mod asks me, for the moment I'm not prompt to remove these two good sources of daily updated informations source.

Last edited by diyiggy; 19th May 2020 at 05:02 PM.
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