I've ordered Khozmo attenuator and gathering another components to build B1 amp. It looks very nice ^^.
It looks as though you are using the first set of inputs, but the bypassing of the switch connections is for the second input. Also, from your leads it looks as though you are testing the right channel, but the input volume pot is connected to the left channel, and I can't see the right channel connected.
Hope this helps.
Hope this helps.
Heresy, perhaps, but as I'm way to lazy to read the entire 406 pages of this thread and have a thick enough skin to withstand the heckling, here's a question - would there be any reason not to use a SMPS such as those by Mean Well etc intended for digital amps for a B1?
NES200-24 Adjustable 20-24 V 200W regulated supply $43
NES200-24 Adjustable 20-24 V 200W regulated supply $43
No heresy nor problems with that at all... it was originally designed around an external supply much less official than that.
Just use a cheap 19v laptop brick similar to this - http://www.amazon.com/LAPTOP-ADAPTER-POWER-SUPPLY-ASPIRE/dp/B000GZSMTU
Just use a cheap 19v laptop brick similar to this - http://www.amazon.com/LAPTOP-ADAPTER-POWER-SUPPLY-ASPIRE/dp/B000GZSMTU
Even with that many steps I still felt I missed out on fine tunikg the volume. I like a good ALPS pot better.
Interesting Attenuator.
But why give up the Balance function of separate Pots?
Used such for years and can't imagine a pre Without such an elegant balance ability
But why give up the Balance function of separate Pots?
Used such for years and can't imagine a pre Without such an elegant balance ability
Because it can be a PIA to change the volume. I installed separate pots in my B1, and everytime I changed the volume I found myself fiddling with the pots to regain the balance I had before changing the volume. When I built my Mezmerize B1 I installed Glassware's A3 Mini Stepped Attenuator.
I agree it can be a PIA until you get the hang of using two pots but if you compromise with a dual pot the central point will be off to one side of the other. No two recordings are exactly the same and or your listening chair is off to one side. I like having the balance ability of two pots. I have tried it both ways multiple times and I like having two pots much better. Anyway I need the exercise of getting the central point exactly to my liking.
It can come down to how much you are willing to sacrifice not have vocals exactly centered. I get irritated when vocals are too far to the left or right.
It can come down to how much you are willing to sacrifice not have vocals exactly centered. I get irritated when vocals are too far to the left or right.
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Erm. IF.. there are sophistications such as markers/numbers on the dials or unit face.
Then..it's a fair No Brainer to match the numbered positions 😉
Ersatz Balance using 3 pots is an old (and proven) idea.
Can't believe it's actually necessary.
That glassware gizmo looks as a bit Agricultural.
Does it perform better than the schematics' suggested Pots ?
Not that I'd fit one, Mere curiosity..is all.
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Mine had numbered positions, but the adjustments were very fine to try and get the right balance. I probably should have used a higher value pots.
So far, I am happy with it. Balancing doesn't seem to be such a chore as it was with dual pots. I have only been using it for a few weeks so maybe the novelty will wear off after awhile 😛
I gave up a balance adjuster way back in the late 1970s or very early 80s. None of my subsequent systems have had any balance control.
Working on my B1 Buffer now. I need to order three 1uf caps and Nelson Pass says in his DIY PDF that he uses three of Digikey BC2076-ND for C3, C100 and C200.
However I've seen it recommended to just use the above cap for C3 and get the Jantzen 1uf caps from Parts Express for C100 and C200.
(http://www.parts-express.com/jantzen-audio-10uf-400v-crosscap-capacitor--027-910)
Which way should I go?
However I've seen it recommended to just use the above cap for C3 and get the Jantzen 1uf caps from Parts Express for C100 and C200.
(http://www.parts-express.com/jantzen-audio-10uf-400v-crosscap-capacitor--027-910)
Which way should I go?
I say go for the jantzens, but some might say they all sound the same. Jantzen makes a good product.
I used v-caps, obbligatos and Jupiter caps. Due to their size, it's a minor disaster in the looks department but sounds great. 🙂
I used v-caps, obbligatos and Jupiter caps. Due to their size, it's a minor disaster in the looks department but sounds great. 🙂
Yeah they are bigger. I'd have to leave the leads extra long and angle them down into the holes.. the cap would be sticking up like 1/2" higher than the board. Don't know if this is okay or not. But is it worth it sonically speaking? The Jantzen sound better than the ones Nelson Pass recommended?