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 NEW  Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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PostPosted: 28 Nov 2011, 15:35 
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Joined: 14 Feb 2010, 13:13
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Location: Lisbon, Portugal
Did anybody also experienced the audio "bump" when you disconnect the pre-amplifier.

Is it due to the 1uF output capacitor?

My SS amplifier doesn´t like it, and enters in safe-mode / protection. What can I do? Maybe an output relay?

Cheers,
Miguel


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PostPosted: 08 Dec 2011, 12:01 
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Location: Lisbon, Portugal
Anybody?


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PostPosted: 25 Feb 2012, 01:54 
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Joined: 19 Feb 2012, 15:25
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Location: Virginia Beach
Bought a Boozhound phono preamp kit today. http://boozhoundlabs.blogspot.com/p/jfet-phono-preamp-kit.html. I will post my build build up when I get it together. This will be my first Audio DIY project. I also have a tube amp kit on order. Supper excited to get my system together and experience music the way it is supposed to heard.

Thanks for all write ups and comments on this project. It help me make my decision.

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PoddWatt with Belden 83803 Mains Power Cable Cord driving Klipsch B-20s and Polk Audio PSW111 Sub,Boozhound phono preamp, Sony TT.


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PostPosted: 25 Feb 2012, 07:22 
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What modification is requiered to run a moving coil pick-up into this wonderful pre-amplifier?


Cheers,

Miguel


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PostPosted: 25 Feb 2012, 17:40 
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Location: Australia
You could use a step-up transformer but I would go for the Le Pacific MC PrePre. This will connect straight into your jFET phono preamp. Its dead simple to make and even run it from batteries as I have.

I have made three Le Pacifics and one Hiraga Bipolar MC stage. I prefer the Hiraga though friends with good ears claim they are close in performance, for the extra work and cost for the Hiraga it may not be worth it.

http://www.diyaudioprojects.com/Forum/viewtopic.php?f=10&t=3633

http://www.diyaudioprojects.com/Forum/viewtopic.php?f=10&t=3046

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Projects: "Parley" - Tube preamp with Pass B1 buffer | "Sanguine" - 6AS7 Headphone amp with Sophia Mesh Plate 274B rec. tube | "Black Lace" - all Ozzie tube 6V6 Power amp - old school
Website: [ retro-thermionic ]


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PostPosted: 06 May 2012, 06:16 
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BierBurner wrote:
Bought a Boozhound phono preamp kit today.


Any progress on this?

I got the last kit in the current batch. Will throw in some pics when its here.


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PostPosted: 06 May 2012, 12:34 
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Location: Virginia Beach
BierBurner wrote:
Bought a Boozhound phono preamp kit today.

mteinum wrote:
Any progress on this?
I got the last kit in the current batch. Will throw in some pics when its here.

Yeah. Finished the kit a while back. Test run went well. Now putting the finishing touches on the chassis and then I will be ready for some project pics to post up

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PoddWatt with Belden 83803 Mains Power Cable Cord driving Klipsch B-20s and Polk Audio PSW111 Sub,Boozhound phono preamp, Sony TT.


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PostPosted: 06 May 2012, 14:13 
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I´m sure you´ll love it!

It´s quiet, very low noise.

I found it a bit "bright", but it seems OK now...

Maybe I got used to it?

Let us know your review.


Cheers!


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PostPosted: 06 May 2012, 19:18 
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Location: Virginia Beach
Yes it is a bit bright. But so much cleaner of a sound than my temporary phono prepamp I was using. The difference is almost night and day. Even the bass notes where brought out.

So my build went a little like this:
-First I did the research on the forums and DIY site. The bang for your buck and simplicity you can't beat. Great customer service and excellent directions. I was sold almost purely on the price of the kit itself. For those of you who are familiar with the HiFi phono preamps you will understand.
-Second was the base build. This is strait forward and you just need to follow the inclosed directions.
-Third and here is where your decisions and creative thinking come in. Since the kit is not sold with a chassis, your configurations are limitless. Finding the right chassis to fit your needs should be an important step in the process of any DIY build. A few things I kept in mind went I decided what chassis to use.
-What will be your power source
-What finish do you plan on putting on it(To many to list)
-What equipment I already had
-Keeping it simple and price low

I went with a Hammond Chassis http://www.parts-express.com/pe/showdetl.cfm?Partnumber=320-820 This provided me the room to place my two 8 pack battery enclosures, my RCA in and out, power switch, and LED

The rest of the items for this build I picked up from my local electronics store and parts express.

I am a Navy mechanic by trade so the chassis build was my favorite. Remember prep is key when doing any machine work and painting. Always measure twice and use the best quality paint. I chose wrinkle black. The pictures really don't do it justice. I figured this finish would match any audio equipment I have or obtain in the future. I used metal bondo to fill in the chassis seams.

So it all comes together and you are ready to flip the switch. I always test builds momentary not hooked to any equipment. A quick go no go test. This was done three times for me. I built the base circuit board and tested. Then drafted the chassis up and place components in. Tested again, and then pulled components out for chassis finishing. Final test after finial assembly. Because this build was so simple it was easy to disassemble and build again in the chassis.

Here are some of the pictures from my build.
Finished chassis
Image

Image
Placing components in and final solder up
Image
All in
Image
My set up. TT on second rack. Stayed with green LED to match PODDWATT
Image

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PoddWatt with Belden 83803 Mains Power Cable Cord driving Klipsch B-20s and Polk Audio PSW111 Sub,Boozhound phono preamp, Sony TT.


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PostPosted: 07 May 2012, 12:10 
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Joined: 28 May 2008, 21:53
Posts: 4245
Location: Winnipeg, CANADA
Hi Uriah, you have put together a nice system. Congrats everything looks great. I hope you are really enjoying the system.

Cheers

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[ DIY Mains AC Power Cable Cord ] - [ K-12 Tube Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


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