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Old 6th November 2009, 07:12 PM   #11
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How about this one ...
How about that one? How did you modify the B1? Did you simply stick in the Cinemag's before the pot?
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Old 6th November 2009, 07:17 PM   #12
Beftus is offline Beftus  Netherlands
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Originally Posted by dsavitsk View Post
How about this one ...
Right Miss Moneypenny, file under crude yet effective.
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Old 6th November 2009, 07:28 PM   #13
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Originally Posted by Bas Horneman View Post
How about that one? How did you modify the B1? Did you simply stick in the Cinemag's before the pot?
Pretty much. This was a hastily thrown together buffer using whatever fell out of the proverbial coffee can for someone who needed something as a stopgap while we work on something else for him. It actually started out using BJTs (similar to this), but the bias resistors had to be so small due to the base current that the input caps needed to be too big, and in the end it evolved into a B1.

The Cinemags allowed balanced input which takes advantage of the higher output from the balanced connection on his cd player -- I wasn't sure how much gain his F1 had so I figured using the full output was a good idea. Only other real difference is that I biased it slightly differently, though I doubt that matters.
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Old 6th November 2009, 07:40 PM   #14
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Here's mine.
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Old 6th November 2009, 10:05 PM   #15
njepitt is offline njepitt  United Kingdom
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Well here's mine. I put it in the case of an old ATX power supply that burned out (OK, OK, I mean, that I blew up....) It was one of the better high -power ones, so the box is nicer than usual. And free... And came with IEC connector and switch already installed... (admittedly in a funny place for a preamp...) I dug up the retro knobs in the usual scrap places. Four switched inputs on the middle one, left and right volume on each side.

My friend's wife saw the photo and asked if it was something to cook on....

I'm planning a new preamp - either another B1 or juma's BF862 preamp, so I'm interested to see all your designs. I particularly like 400's design above. Very slick indeed...

Cheers

Nigel
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Old 7th November 2009, 06:27 AM   #16
400 is offline 400  Germany
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@ grufti

I don´t no your circuit in the moment.
The layout I have used is based on the original schematic from Nelson Pass. For the layout I have had a look on some layouts I found in the internet.
Below you can see the layout I have designed (lettering is mirrored for assembly print)
I have posted the layout somewhere in the forum, but unfortunately there where no hints or remarks for me.
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Old 12th November 2009, 08:43 AM   #17
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@ 400
do you have more info/pics on your F5 build somewhere?
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Old 12th November 2009, 04:46 PM   #18
400 is offline 400  Germany
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@martinschki:

Post your Solid State pics here.

Platinen von cviller
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Old 13th November 2009, 02:42 AM   #19
max426 is offline max426  United States
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Here is my B1. This is my first audio diy audio project (F5 built in parallel), so go easy on me. The first pic is the old well worn Bogen amp that I started with. All parts are from the B1 article except the nichicon caps.

Many thanks to Mr. Pass, and all on DIYA

First impression of the sound of B1/F5........
I am loving 55


jim
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File Type: jpg DSCN3787small.JPG (267.0 KB, 1185 views)
File Type: jpg DSCN3795small.jpg (133.3 KB, 575 views)
File Type: jpg DSCN3857small.jpg (193.9 KB, 814 views)
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Old 13th November 2009, 01:13 PM   #20
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Nice jobs, Max426!

Especially your power amp is very, very cool

Karsten
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