Progress on my JE Labs 300B - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 20th October 2002, 12:53 AM   #1
diyAudio Member
Join Date: Sep 2002
Location: Memphis, TN
Talking Progress on my JE Labs 300B


Just wanted to say that I am progressing well on my 300B project. Here is a link to my site showing my progress. Just thought you might be interested. Pardon my site, this is my first attempt..

My site:

Best regards,
  Reply With Quote
Old 20th October 2002, 12:13 PM   #2
diyAudio Member
Brett's Avatar
Join Date: Jan 2002
Default Walton amp

When you turn it off, does it say "Goodnight John-boy"?

Sorry, couldn't resist.

It's looking good, and you work pretty fast. Thanks for showing us how it's going.
One comment would be, if you're going to mount the trannys on rubber grommets, use a grommet, or small O ring top and bottom of the chassis plate, with a bolt that runs right through (brass is nice). Then get a crimp/solder connector in an O shape (like a table tennis bat) and attach it to one of the bolts with a wire taken to your earth (do it from underneath). This way vibration from the trans is not mechanically shorted to the chassis by the screw you mentioned you were planning to use in the mount. The top of the bolt should be on to the trans' foot. Make sure there is an electrical connection to the transformer, ie no paint in the way.

Looking forward to seeing more of it as it comes along.

  Reply With Quote
Old 20th October 2002, 12:44 PM   #3
diyAudio Member
Join Date: Sep 2002
Location: Memphis, TN

Thanks for the comments! Though I didn't explain it that well that is exactly how I planned to ground the tranny. Will post more as I do it!

  Reply With Quote
Old 20th October 2002, 05:19 PM   #4
diyAudio Member
Join Date: Dec 2006
Hello CK,

Very nice indeed ! I am building the same amp. Still collecting some parts, tranny's are done, ( electraprints ) and are on thier way here.

I like the circle cutter idea. I am/was? going to use copper plate for the tops ( 1/8 =.125 ). How thick is your aluminium plate? What are the L x W dimensions of the plate? whole base?

Also, would it be possible to see the bottom sides of your chassis?
Just more information.

Please keep me informed and I WILL! keep you informed of my progress.

  Reply With Quote
Old 21st October 2002, 12:47 AM   #5
diyAudio Member
Join Date: Sep 2002
Location: Memphis, TN

Thanks for the comments. I had seen your earlier posts and know what you are going through. I have been gathering parts most of this year and am now starting to see this thing come together. I still lack some of the resistors and caps of which I plan on ording sometime next week.

The chassis top is .09 inch thick and measures 10" x 16". Here is a link to the site with more specifics; I purchased two #3 chassis.

Welborne Labs Chassis

Yes, the circle cutter worked out better than I had expected. Perfect holes. Just remember to run the drill press at a very slow speed (350 rpm) and to have the chuck as tight as possible. Also, find some scrap and cut a few practice holes.

I plan on doing more pictures this week, I spent today working on one of my Fishers and ran out of time

More later.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: for 300B (JE Labs 300B SE) builders cartman Swap Meet 2 29th October 2008 01:13 PM
300B bias of a JE Labs? harbin Tubes / Valves 2 3rd August 2006 11:28 PM
Gain of JE labs 300B? jaykick Tubes / Valves 2 26th June 2006 02:13 AM
JE Labs 300b round 2! layout TubeHound Tubes / Valves 12 13th May 2003 08:46 AM
Je labs 300b DIY project for NG? TubeHound Tubes / Valves 23 1st October 2002 04:58 PM

New To Site? Need Help?

All times are GMT. The time now is 03:53 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2