b1 buffer preamp suitable voltage

mass1363 · 13th May 2013, 08:16 PM

Hello everybody,
I was reading that the suitable voltage for the B1 buffer preamp from Nelson Pass is between 18V and 24V.
I'm wondering if I'll have catastrophic results if I power it with only +15V ...?

Thank for answers

Zen Mod · 13th May 2013, 09:16 PM

not catastrophic , but thd will rise

AndrewT · 14th May 2013, 10:35 AM

A 2.2Vac signal will be ~7dB below maximum output. That's still an adequate headroom to help avoid excess distortion.
Normal signals through the B1 will more likely be <<1Vac

Superstrand · 16th May 2013, 06:32 PM

I have run mine with a single nine volt battery as an experiment, no catastrophe. I do run it at 18 volts, though, because that's what papa said to do. Here is a picture of the build, notice the empty Guiness and dinner in the crockpot. (This construction method is not recommended if your spouse is home).

13th May 2013, 08:16 PM	#1
mass1363 diyAudio Member Join Date: Jan 2012	b1 buffer preamp suitable voltage Hello everybody, I was reading that the suitable voltage for the B1 buffer preamp from Nelson Pass is between 18V and 24V. I'm wondering if I'll have catastrophic results if I power it with only +15V ...? Thank for answers

13th May 2013, 09:16 PM	#2
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	not catastrophic , but thd will rise __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

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14th May 2013, 10:35 AM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	A 2.2Vac signal will be ~7dB below maximum output. That's still an adequate headroom to help avoid excess distortion. Normal signals through the B1 will more likely be <<1Vac