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Old 17th January 2012, 07:20 AM   #1121
juma is offline juma  Germany
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Quote:
Originally Posted by audionut View Post
... so this pre amp is not suitable where you need to swing voltage up to 2v into a lowish gain amplifier ??
If you don't mind 5% THD at 2V output, you'll be fine.

Quote:
Originally Posted by mhouston View Post
My BoZ and BoZSE produce 17V p2p of swing before any degeneration of sine wave. I run mine on 27V. I'm using the BL series of jFets.
I suppose you mean JBOZ. If that's so, 17V p2p is 6V RMS. JBOZ puts out 2V with 5% THD at 16V PS. I don't know how much THD you'll get with 27V PS at 6V RMS output, but if you like the sound, everything is fine.

If you mean the old BOZ (with MOSFET) that's another pair of socks...
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Old 24th May 2012, 06:39 PM   #1122
TB is offline TB  United States
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Hello,
Is it possible to use 1.2k input resistor instead of 1k and 470 Ohm output resistor instead of 475 one without ill efects?
I want to build original pre based on schematic posted by Mr. Pass in post #2 with 16 Volts PSU.
Thanks
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Old 24th May 2012, 07:15 PM   #1123
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Absolutely... And I'm in Nova too, why don't I know you ;-)

Roscoe
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Old 24th May 2012, 08:52 PM   #1124
TB is offline TB  United States
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Hello Roscoe,
Thanks for the answer.
Where are you located in Nova?
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Old 24th May 2012, 10:23 PM   #1125
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Out near Warrenton. We have a DC area DIY group that gets together about monthly. Unfortunately most of them are in MD, we could use some more in VA ;-) We're going to have two rooms at the Capitol Audio Fest this year . See HiFi Heroin for commentary on our room from last year.

Roscoe
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Old 29th May 2012, 04:18 PM   #1126
TB is offline TB  United States
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Hello Roscoe,
I am in Arlington. Warrenton is nice and higher altitude is better for HiFi sound
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Old 24th August 2012, 08:17 PM   #1127
tfender is offline tfender  Thailand
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Very Good
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Old 22nd September 2012, 09:42 PM   #1128
tinitus is offline tinitus  Europe
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hey, I can report that I have got a simple jfet boz test amp up and running for my bass guitar

+17.5V before Drain resistor
7.1V measured over it (1250ohm)
-82mV measured over source resistor (15ohm)
carbon film resistors
signal resistors are metal film

needs volume att and buffer
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Old 22nd September 2012, 09:50 PM   #1129
6L6 is offline 6L6  United States
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How are you using it? To put the instrument into your stereo? As a gain pedal? Driving a amp? (Combo or head) ?

Just curious.
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Old 22nd September 2012, 09:57 PM   #1130
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by 6L6 View Post
How are you using it?
only one jfet so far
so its just mono, but split to 2 outputs/RCA going to a 2 channel stereo preamp

but hope to have more of them later

dont know if this is of any use to you guys
but for my particular project its clear to me that every gain stage must have its own attenuator to control the gain, and as a result, additional buffer

so to those who have a B1, but desperately needs the additional gain, just put the simple jfet in front of the B1
could be there will be minor grounding issues to deal with
or could just a small ad-on with its own battery supply( I think Nelson also suggested battery)
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