My DIY Pre/phono Pre/Active XO/tube buffer

hoosier21

just frigging cool,

ben62670

Boards came in yesterday. The UPS guy stuck them behind a down spout It rained. I am glad the boards were sealed in plastic. Today I should have about 700 1% resistors, a dozen or so OpAmps, and a fistful of little caps. I am making three of these. An ugly one for me to experiment with, and a nice one to do a swap program so Polkies with a good rep can try it out. What I want most with this is I want feedback to let me know how it works with different systems(or if it sucks:eek:). A couple guys have already volunteered:cool: One thing this brainiac forgot on the board was mounting holes:o All the time I spent working on circuit design, research, and layout I forgot to put four stinken hole in the damn thing I am starting to thing maybe sleep might do some good. I don't know. Just a thought.
Ben

ben62670

I am going to kill. I spent almost 3 hours prepping my order for DigiKey. I went all the way through. I entered every single part. Definitely over 700 pieces. I choose how to ship. Everything. They gave me an order number. They said they were going to email my total. Everything was done. Not only has it not shipped, but they can't even pull up the order. I complained saying that nearly everywhere else If I even start an order it is saved in my cart. Her answer was they just changed systems. Sorry. I am so pissed that I could smash something. Their are so many items to reorder it isn't funny. Anyone who has ordered many pieces from here know how much of a pain it is. I think I am going to wipe my A$$ with their catalog when it gets here. I really wanted to be able to have some burnin time on the Pre/XO/phone/tube buffer before PFGA.

ben62670

1145 items were in the list.

ben62670

All I can say is WOW. I got it fixed with DigiKey. They found the order, and its processed, and packed already. The guy(or gal) that got my order must have been a little irritated when they saw how many different pieces they had to dig up:eek:
1 40 47.5KXBK-ND 0.09800 $3.92
2 20 681XBK-ND 0.09800 $1.96
3 20 2.21KXBK-ND 0.09800 $1.96
4 10 110KXBK-ND 0.09800 $0.98
5 200 750KXBK-ND 0.03705 $7.41
6 20 33.2KXBK-ND 0.09800 $1.96
7 200 0 1.00KXBK-ND 0.03705 $7.41
8 20 100KXBK-ND 0.09800 $1.96
9 200 10.0KXBK-ND 0.03705 $7.41
10 20 1.50KXBK-ND 0.09800 $1.96
11 20 15.0KXBK-ND 0.09800 $1.96
12 20 100XBK-ND 0.09800 $1.96
13 10 47.5XBK-ND 0.09800 $0.98
14 1.21KXBK-ND 0.09800 $1.96
15 20 182XBK-ND 0.09800 $1.96
16 200 22.1KXBK-ND 0.03705 $7.41
17 20 P2.7W-3BK-ND 0.47600 $9.52
18 10 MPR5-0.1J-ND 0.64000 $6.40
19 10 OPA2134PA-ND 2.43000 $24.30
20 20 495-1091-ND 0.12400 $2.48
21 10 495-1131-ND 1.51800 $15.18
22 10 495-1094-ND 0.12400 $1.24
23 10 495-1121-ND 0.51200 $5.12
24 10 495-1103-ND 0.12400 $1.24
25 2 296-13996-5-ND 0.80000 $1.60

ben62670

One more day and my iron will be on for some serious soldering. I feel like a kid before Christmas

ben62670

Well my parts came early! Yeah. So....

Yes the tube stage is still going to be in the mix, just not the pic

Systems

ben62670 wrote: »

Well my parts came early!

I bet you where as giddy as a little school girl when the delivery truck showed up.:D

Cool, looks like a rotary encoder -relay setup for source selection.Nice;)May I ask where you found this little gem?

ben62670

GV#27 wrote: »

I bet you where as giddy as a little school girl when the delivery truck showed up.:D

Cool, looks like a rotary encoder -relay setup for source selection.Nice;)May I ask where you found this little gem?

YES I WAS!
Which little gem?

Systems

ben62670 wrote: »

Which little gem?

The remote control volume ,relay controler and relay board.The red boards would have me quessing China?I could use something like this.

ben62670

GV#27 wrote: »

The remote control volume ,relay controler and relay board.The red boards would have me quessing China?I could use something like this.

Your close on that piece.

ben62670

Lasareath wrote: »

Very Cool Ben, Put me on the list to test out your stuff!

Sal

Will do. I am very excited. I am going to put power to it this evening. All the pieces are highly recommended by the DIY community. Most of my research is reading reviews on caps, resistors, PS's, OpAmps.....
You think cable debates are bad. Try going through same cap, but different voltage.... It'll make your head spin.

engtaz

Looking very good. Fred is a great source of info. His tube pre was very very nice. Too bad I had to return it. LOL

engtaz

ben62670

engtaz wrote: »

Looking very good. Fred is a great source of info. His tube pre was very very nice. Too bad I had to return it. LOL

engtaz

Yep His help in the ADOTC thread has inspired me to get my ears on tube Pre's. I need to modify it some. The gain is to high for this app. It doesn't play well with variable resistance so the tube part will take some time. I am hoping the rest is right first shot.

Face

Done putting it together yet?

Systems

Face wrote: »

Done putting it together yet?

Leave him alone, he's busy soldering.:D

jerryj12

Looks very cool man. I cant wait to hear it.

ben62670

jerryj12 wrote: »

Looks very cool man. I cant wait to hear it.

I am sure your are going to be the second after me;)
Thanks Jerry
Ben








BTW don't blow my tweeters:D

heiney9

Ben, put me on the list to "sample" your final product. You are responsible if it damages my system :D.

Very Cool.

H9

engtaz

me too

engtaz

ben62670

You guys are on the list. I'll save this thread, and we will do a swap. I reserve the right to tell unknown members to get bent:eek::D:p
Thanks Guys
Ben

Systems

whats in the secret box?

Chuck

ben62670

A secret:)



Only one Polkie has seen it, and there will be no eyes on it till after the fella's have heard my speakers;)

Systems

Jerry, whats in the secret box?

Chuck

ben62670

Guess what I have been listening to. Well I can go to bed now;) BTW the phone is better than the Outlaw990's.

Systems

Great...box up MY 990. I'll be coming for it next weekend. And I'll be letting you play with a little 5 tube design passive pre I'm not using.

Chuck

ben62670

Will do Chuck. I have been playing this thing non stop since 6am or so. It's starting to come into bloom. At first I was disappointed, but there are some nice caps in the signal path that need some time. The PS sucks. I didn't have the money to use a toroid, but I should have one on the way. The remote is real flimsy, but I programed my one for all. I may implement a switchable sub sonic filter(rumble filter) for when I am cranking it. With my big speakers I am getting feedback in the platter, tonearm or what ever. Also I am building a separate PS with an earth ground. Tying the phono ground into the ground in the PS doesn't cut it for the gain this has compared to the Outlaw. Also I am going to increase the gain in the Pre. It goes almost high enough, but the dial is at near full, and I am going to be driving my GFA-585, and 565's with the same circuit. I did however install a pot(volume control) on the highs to match the high pass to the low pass. My gainclone amp that I built for the highs is a lot more sensitive than the big Adcom's. The gainclone reaches full out with around 1v, and the Adcom's need a little more than 2v each. I need to get some 6pdt switches to implement the passive Pre section, and the tube section. Right now it is full SS.
Ben

ben62670

Well I moved the PS to an external box. Actually I just built another one. This time I snubbed it properly, and chose to do the regulation inside the Pre. There is 4000uf unregulated, and 440uf regulated. The rectification is in the PS box, and also an earth ground is located there for the phono Pre. Now everything is dead quiet:)

The case is an old JVC tuner that I gutted. I picked up some 2x36x.125 aluminum flat stock so I could setup decent jacks on the rear, and clean up the face plate.

Ben

hypertone

Wow, that's awesome. Where did you get the remote volume board?

Stew

Cool project Ben! What tube/tubes are you using?