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JFET BOZ Preamp
JFET BOZ Preamp
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Old 4th May 2012, 03:54 AM   #1
john65b is offline john65b  United States
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Default JFET BOZ Preamp

2SK170 JFET BOZ Preamp in nice Aluminum Case.

Built per the schematic by Nelson. But instead of 25k volume pot, I have a 100k stepped attenuator, and the 10uf cap is a Wima 1.5uf. Preferred the sound of the 1.5uf Wima over any 10uf cap I had...

The "stop" at Max Volume has worn down, and can rotate full turn - there is slight resistance from full volume to min volume...

Overall very clean sound with lots of gain (too much for anything I needed)

Powered by 19 VDC Laptop power supply (included).

How does $140 sound?
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Old 11th May 2012, 04:12 AM   #2
john65b is offline john65b  United States
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$130? Offers/trades considered...
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Old 19th May 2012, 01:38 PM   #3
john65b is offline john65b  United States
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$120??
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Old 19th May 2012, 03:45 PM   #4
jmillerdoc is offline jmillerdoc  United States
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I am interested....will this run on 12v? Is it a split rail voltage? What is the minimum voltage it will run on?
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Old 19th May 2012, 04:54 PM   #5
john65b is offline john65b  United States
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The circuit should work with 12v. It is not dual rail - singe rail with PP Cap output.

According to the thread, if I remember correctly, 16V was the optimim with teh proposed circuit.

I can drop price if you don't want the PS
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Old 29th May 2012, 03:22 AM   #6
john65b is offline john65b  United States
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Still available...
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Old 9th June 2012, 02:15 PM   #7
john65b is offline john65b  United States
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