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B1 Rev. 2
B1 Rev. 2
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Old 27th May 2018, 08:52 PM   #151
Zen Mod is offline Zen Mod  Serbia
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B1 Rev. 2
match them , while enjoying in coffee and beer

then set output offset with 20R trimpot,while enjoying in coffee and beer

then enjoy in plenty of music , with or without coffee and beer

remember - you're not making life supporting equipment ....... at least not commercial one

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Old 27th May 2018, 09:02 PM   #152
WalterW is offline WalterW  Netherlands
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B1 Rev. 2
I knew you would give an answer like this
Anyone else?


BTW: it is thee and wine
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Old 27th May 2018, 09:15 PM   #153
radule is offline radule  Serbia
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In this arrangement AC and DC parameter of circuit is not separated, so
you must to trim offset to minimum and you have what you have.
No freedom for sound adjustment.

Much more funny is to place coupling cap to output and extend potentiometer shaft to front plate In that case you can adjust sound with pot.....
..... positiv 2nd, negativ 2nd, nulling...
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Old 27th May 2018, 09:30 PM   #154
Kim Bay Smidt is offline Kim Bay Smidt  Denmark
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While waiting for the B1 Nutube edition I put the B1 rev 2 together.

I followed Mr. Pass' general rule: 'use what you have'.

I only had 500 Ohm trimmers so each leg is paralleled with a resistor to bring the resistance down.

The PSU is made of one SilentSwitcher (see the store) followed by a pair of Hypex regs to bring the voltages down to +/-12V. The SilentSwitcher is powered by a USB power bank.

I'll be delighted if the B1 Nutube is any better than this one 'cause its damn good as it is. Go Build 1 yourself.
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Old 28th May 2018, 12:26 AM   #155
woofertester is offline woofertester  United States
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Quote:
Originally Posted by ludkokanta View Post
Click the image to open in full size.

it is a "JFET input Cascoded Buffer Board" for a few $ from ebay.

It should be a piece of cake to use for the b1 rev 2 (with an external supply pcb), but there are a few parts more on this pcb. What do you thing about those?
I bought some of these for amusement. The objective performance is good. -3dB at around 1.8 MHZ. Output impedance around 1k ohm. These could easily be operated at the +/- 24V rails of the First Watt amplifiers. I will test these with the Edcor transformers purchased for the M2X.
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Old 28th May 2018, 08:03 AM   #156
Zen Mod is offline Zen Mod  Serbia
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something is fishy there

Rout needs to be roughly (1/Yfs)/2 , if you got genuine JFets
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Old 28th May 2018, 09:58 AM   #157
wdecho is offline wdecho  United States
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(QUOTE\ I'll be delighted if the B1 Nutube is any better than this one 'cause its damn good as it is. Go Build 1 yourself.[/QUOTE])


The B1 v2 is my go to volume control for all my amplfiiers. I have the Pete Millett Nutube version and it and NP Nutube pre are what NP calls sound effect devices which introduces some 2nd harmonic for those that like such. I rarely use the Nutube but it was fun to build and I am glad I have it.
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Old 28th May 2018, 12:17 PM   #158
woofertester is offline woofertester  United States
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Quote:
Originally Posted by Zen Mod View Post
something is fishy there

Rout needs to be roughly (1/Yfs)/2 , if you got genuine JFets
Thanks for the formula. I will take measurements again and post the procedure and results. I can also do the procedure an a matched set of Punkydawgs genuine K170/J74.
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Old 10th July 2018, 02:52 PM   #159
zek is offline zek
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Has anyone made a board for B1 Rev.2 with a complete power supply?
Some pictures, please.
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Old 10th July 2018, 04:08 PM   #160
mikebarney is offline mikebarney  United States
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Default Pass B1R2 buffer with power supply

I've made a PCB with an LT1086/1033 regulator and Pass B1R2 buffer, details here:
Pass B1R2 Buffer - mpbarneyamps
Mike
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