We are having a small Giveaway! The prize is the popular book Building Valve Amplifiers by Morgan Jones.

See the DIY Audio Books and Manuals page for a brief overview of the book.

To enter the contest, all you need to do is post one message in this thread with one or more photos attached and a brief description of the photos. The photos should be of something you have built and related to audio or electronics. There will only be one winner and the winning entry will be chosen at random (random number related to message #).

PS - uploaded photos need to be less than 250kB.

Questions or comments related to the photos or the contest should be posted in this thread: Discussion - diyAudioProjects.com Giveaway #1.

Rules:

• Please do not enter if you will not use the book.
• Only one entry per person (do not post more than once in this thread).
• Contest Ends January 15, 2009 at 18:00 (CST) (UTC-6).

We will announce the winner here and make contact via email to get the mailing address.

Good luck!

I am in. My plan is to rebuild and re-case this 50eh5 amp for my son to use with his ipod. Once I get started on it I will start a thread because I will have some question I am sure. I thought it would be kind of cool to head off to college with a Tube Amp for your ipod. For his 18th birthday I will have to work out a true dock and charging station.

Alan

Okay, I am going after they psychology of the contest and of the humans running it Who can resist this photo?!?
Super cute kid and a few hundred MyRefC LM3886 amp boards !!
Contest is ON. Compete with that!

Here's my entry that I just got up and running. Its a small mono amp that I built for use at my desk at work.

Based on the 6197 Spud Amp by Jeff Larson at Abraxas Audio.
http://home.att.net/~abraxasaudio/projects/6197info/kit.html

Solid state rectification, Filter cap from an old Heathkit, other various scavenged parts. Mallory L-pad volume control (still need to trim down the shaft), all crammed into a nice little wooden box that a micrometer came in.

Mono, because i didn't have parts for two channels, and stereo is just a gimmick.

Hooked up to a Scan 15W free air, who's frequency response probably does a nice job matching that of the output tranny.

Take it easy,
John

Hello, I will definitely use this book. I am restoring a guitar amplifier, as well as an Otari 5050 BIIHD, and have modified and plan on modifying more microphones.

Attached is a photo of the guts of my tube amp.

Thanks!

Thanks for the chance to be a part of the Giveaway! I follow your blog via RSS and also administer the The Tube Amp Network, a Ning site for guitar amp enthusiasts. I would love a copy of this book

Here are some pictures of my first amp build: The Two-Stroke Amp from a design by Dave Hunter in his book "The Guitar Amp Handbook" and my second build, "The Firefly" :a push-pull 1.5 watt tube amp utilizing two 12AX7 preamp tubes and a 12AU7 preamp tube in a self-split power tube configuration.

Thanks for hosting this forum!

Gio I want the book. I love valves and though I'm near 57 years old I don't mean heart valves. Love to have the book though.

Here is an image of the layout for Woody Pro. Woody Pro is the single 2N3055 on a timber block preamp. You can see the 2 X 10uf X10 output caps, the engine block and the daul power supplies. Nearly finished the PSs then a case drill and assemble.

i post this

gainclone LM 1875... spent half a day to build, burnt the rest for listening iPod on it..

This got me thinking that I really should get some new books. Last year I bought a stack of old magazines from the 1930s. One thing led to another and I ended up building a copy of the Wireless World Quality Amplifier, a British amplifier design from 1934 that remained the gold standard for British audio until the Williamson in 1947.

This amp was completed on Saturday, so it's only had a few hours use, but I can find no fault with it so far.

My notes on the project are here -
http://mike.wepoco.com/retro-geekery/va ... -Amplifier

Here is my contribution, it has been around already but tube all together. The book will be nice as I have been studying I can finally have a better perspective. Great thread as well, more ideas!

Rogers