heres the link cos I'm not sure how to get more than one big photo on a post...
Vitalstates- Amplifiers
Ed
Vitalstates- Amplifiers
Ed
Here's My B1, 1st DIY
Hi to one and all, with special thanks to Mr. Pass:
A couple of photos of my B1. Finished it last Thus./Friday and have been listening pretty much constantly since.
Note the "fabricated from billet magnesium knobs"
and the hickory case made from a tree that fell in my father-in-law's woods 25 years ago.
Am hearing things I've never heard before, and some things that used to be prominent are farther back in the mix than before. Bass is clearer, not as resonant. High end is much softer and more like I remember records sounding like.
Note that I am powering a GFA 555 amp that I bought in 1986... It sounds a lot more linear at both lower and higher volumes--less "confused." Would have never been able to afford a new preamp, so this was really a great treat to get such an improvement for little or no money! Thanks for your generosity Mr. Pass, I have really enjoyed my Adcom gear that you designed, and now I can afford some of your other stuff (if I build it myself!)
Jonathan Smith
Hi to one and all, with special thanks to Mr. Pass:
A couple of photos of my B1. Finished it last Thus./Friday and have been listening pretty much constantly since.
Note the "fabricated from billet magnesium knobs"
and the hickory case made from a tree that fell in my father-in-law's woods 25 years ago. Am hearing things I've never heard before, and some things that used to be prominent are farther back in the mix than before. Bass is clearer, not as resonant. High end is much softer and more like I remember records sounding like.
Note that I am powering a GFA 555 amp that I bought in 1986...
It sounds a lot more linear at both lower and higher volumes--less "confused." Would have never been able to afford a new preamp, so this was really a great treat to get such an improvement for little or no money! Thanks for your generosity Mr. Pass, I have really enjoyed my Adcom gear that you designed, and now I can afford some of your other stuff (if I build it myself!)Jonathan Smith
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Batteries...
The clerk at Radio Shack _did_assure me that the batteries were audiophile grade.
The preamp is now sporting a brand new hewlett packard regulated 20 V power supply from Wal Mart, currently on sale.
I think it sounds just as good, and particularly better than when the circuit is running on 6 volts, like when your audophile batteries are giving up the ghost.
The clerk at Radio Shack _did_assure me that the batteries were audiophile grade.
The preamp is now sporting a brand new hewlett packard regulated 20 V power supply from Wal Mart, currently on sale.
I think it sounds just as good, and particularly better than when the circuit is running on 6 volts, like when your audophile batteries are giving up the ghost.
Here's my take on the B1. It will be the input-buffer of an integrated amp I'm building for a friend of mine. I somehow like to p2p and make connections with the components' leads. Half the solder joints.
Today I'll add the resistors. Cute amp.
Edit: In the hand-drawn schematic half the caps (Panasonic FC 2200uF50V) have wrong polarity, yes. I was used to draw bipolar supplies, so...
But they were installed correctly as you can see in the pic.
Today I'll add the resistors. Cute amp.
Edit: In the hand-drawn schematic half the caps (Panasonic FC 2200uF50V) have wrong polarity, yes. I was used to draw bipolar supplies, so...
But they were installed correctly as you can see in the pic.
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And here's the data from matching the 100 2SK170BL.
First histo shows I_dss abundance with bins 0.04mA wide.
Second shows same with bins 0.01mA wide.
Third pic shows data.
The JFETS used have (7.68,7.68,7.67,7.66)mA I_dss.
Edit: I ended up with 26 unmatched JFETs, the others are matched within 0.01mA up to 0.04mA, so 37 pairs in total.
First histo shows I_dss abundance with bins 0.04mA wide.
Second shows same with bins 0.01mA wide.
Third pic shows data.
The JFETS used have (7.68,7.68,7.67,7.66)mA I_dss.
Edit: I ended up with 26 unmatched JFETs, the others are matched within 0.01mA up to 0.04mA, so 37 pairs in total.
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Banned
Joined 2002
Here is my build.
Been running for a few months now, I do enjoy it very much.
The PS is a regulated 18V wall wart. PassDiy board and pretty much stock parts.
Thank you Mr. Pass and associates that are leased/rented or otherwise indebtured.
The downside is that now i need a new phono amp.......
Been running for a few months now, I do enjoy it very much.
The PS is a regulated 18V wall wart. PassDiy board and pretty much stock parts.
Thank you Mr. Pass and associates that are leased/rented or otherwise indebtured.
The downside is that now i need a new phono amp.......
Attachments
Banned
Joined 2002
If you mean mine, thanks. Yes i did, i went looking for a ackDAC case at Ikea, but they were all too small, i found this in the toy section. My kids got the oversized mecano bits, and i got the box. It all comes apart, and is easy to mod, just plastic and wood. Would like to use them for an F5 but not sure about the heat.
Banned
Joined 2002
I thought i would post some pictures of my B1 Case, ( for now ) Till i can afford the one i really want.
This case was built for me 4 years ago, it lived in a padded box, the metal came from a old recycled sign that is why it still has the reflective material on it, i will remove it off soon
I have ordered my self a nice hand full of gold Rca connectors 18 flip switches the nice 10uf caps, ( cheap ones for now till i can afford a set that are 60$ ) a nice 25K noble pot from ebay and i have a nice 18V regulated laptop psu ill use for now till i build one.
Noble pot was 19$ on ebay for a 25k one, there is one left from the seller.
This case was built for me 4 years ago, it lived in a padded box, the metal came from a old recycled sign that is why it still has the reflective material on it, i will remove it off soon
I have ordered my self a nice hand full of gold Rca connectors 18 flip switches the nice 10uf caps, ( cheap ones for now till i can afford a set that are 60$ ) a nice 25K noble pot from ebay and i have a nice 18V regulated laptop psu ill use for now till i build one.
Noble pot was 19$ on ebay for a 25k one, there is one left from the seller.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Been waiting for rca-sockets for over a week
starting to feel frustrated.Banned
Joined 2002
Banned
Joined 2002
I ordered the boards from peranders on this forum, the rca's were from ebay(sent 11th. of december), last time I'll order something urgent from ebay
Gota love snail mail eh ?
I think i'm going to order a dozen or so pairs of these, I really like them.
4pcs Top CMC 805-2.5AG RCA Sockets Silver Plated New - eBay (item 270503645139 end time Jan-17-10 20:55:58 PST)
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