New Tim Mellows OTL project - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

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
Reply
 
Thread Tools Search this Thread
Old 30th January 2012, 03:08 PM   #21
diyAudio Member
 
Join Date: Oct 2008
Default Anodising the top panel

on my first attempt I tried unsuccessfully to seal the top panel in a steam box, I have tried a few test pieces and get better results boiling in de ionised water....
I just need to get a pan large enough to take a 300mm x 430mm panel.
Attached Images
File Type: jpg Anodise.JPG (333.2 KB, 750 views)
  Reply With Quote
Old 30th January 2012, 06:02 PM   #22
M Gregg is offline M Gregg  United Kingdom
diyAudio Member
 
M Gregg's Avatar
 
Join Date: Jun 2010
Location: UK
Quote:
Originally Posted by smith01793 View Post
on my first attempt I tried unsuccessfully to seal the top panel in a steam box, I have tried a few test pieces and get better results boiling in de ionised water....
I just need to get a pan large enough to take a 300mm x 430mm panel.
This is interesting...

Please give full info of how you are anodising ..chemicals and type of power and currents etc..just for fun of course..

What colour are you going to use?

On my visits to anodising the vats were open and heated to a specific temp. Coveyor feed...It is possible to burn the aluminium and get a speckled effect (over current)<<not good..

Regards
M. Gregg
__________________
What is the sound of one hand clapping?

Last edited by M Gregg; 30th January 2012 at 06:06 PM.
  Reply With Quote
Old 30th January 2012, 07:19 PM   #23
TheGimp is online now TheGimp  United States
diyAudio Member
 
TheGimp's Avatar
 
Join Date: Aug 2009
Location: Johnson City, TN
We used Rit Dye in college to get different colors. I don't know if the composition of Rit dye has changed since then (late 1970s) as I've seen reference to a liquid and what we used was in powder form.
  Reply With Quote
Old 31st January 2012, 07:36 AM   #24
diyAudio Member
 
Join Date: Oct 2008
Hi,

I am using sodiumbisulphate as the electrolite instead of the usual nasty sulphuric acid (this is used to lower the ph in swimming pools) so far with good results on small samples.

I have done a test on a small plate using yellow printer ink as the dye to test and this worked well but for my amp I want silver.
as for the current most on line diy info suggests 12 amps per square foot per hour with a max current of 6A to avoid overheating thus at max curent taking 2 hours to anodise.
. I have built a variable psu for testing but I used a car battery charger with a 10000 uf cap for the large top plate.
  Reply With Quote
Old 31st January 2012, 09:18 AM   #25
lechuck is offline lechuck  Netherlands
diyAudio Member
 
Join Date: Mar 2011
Location: Amsterdam
Smile Very interesting!

Quote:
Originally Posted by smith01793 View Post
Hi,

I am using sodiumbisulphate as the electrolite instead of the usual nasty sulphuric acid (this is used to lower the ph in swimming pools) so far with good results on small samples.

I have done a test on a small plate using yellow printer ink as the dye to test and this worked well but for my amp I want silver.
as for the current most on line diy info suggests 12 amps per square foot per hour with a max current of 6A to avoid overheating thus at max curent taking 2 hours to anodise.
. I have built a variable psu for testing but I used a car battery charger with a 10000 uf cap for the large top plate.
Hi,

This sounds very interesting! Would it be possible for you to open a new topic and describe the proces that you are using to anodize aluminum? I think allot of diy members (like myself) could benefit from knowing this information
  Reply With Quote
Old 31st January 2012, 09:30 AM   #26
M Gregg is offline M Gregg  United Kingdom
diyAudio Member
 
M Gregg's Avatar
 
Join Date: Jun 2010
Location: UK
Quote:
Originally Posted by lechuck View Post
Hi,

This sounds very interesting! Would it be possible for you to open a new topic and describe the proces that you are using to anodize aluminum? I think allot of diy members (like myself) could benefit from knowing this information
Yes please create a DIY anodising for dummies thread...

This sounds like I'm joking but I'm not..This would be brilliant for the DIY forum..

A few diagrams of the circuit and setup would be great...perhaps a few photos of your anodised parts and progress..Well with printer ink there are a few coulours
Magenta, Blue, Black, Cyan, it goes on..

Regards
M. Gregg
__________________
What is the sound of one hand clapping?

Last edited by M Gregg; 31st January 2012 at 09:37 AM.
  Reply With Quote
Old 31st January 2012, 01:34 PM   #27
diyAudio Member
 
dillmeister's Avatar
 
Join Date: Jun 2009
Location: Prince George
I am also interested in your anodizing process. I have several projects sitting around polished waiting for me to electrify a bucket of battery acid. +3 for a new thread.
__________________
I used to be indecisive, but now I'm not so sure.
  Reply With Quote
Old 5th February 2012, 11:49 AM   #28
diyAudio Member
 
Join Date: Oct 2008
Hi all,

I will start a new thread on my anodising antics when I get the time,
at the moment I am busy with the OTL project.
Attached Images
File Type: jpg start.JPG (328.9 KB, 634 views)
File Type: jpg tagstip.JPG (330.7 KB, 595 views)
File Type: jpg bar.JPG (329.8 KB, 592 views)
__________________
Any Progress is Progress
  Reply With Quote
Old 5th February 2012, 02:53 PM   #29
diyAudio Member
 
Join Date: Oct 2008
Finished fitting rails for all the caps ( 2 more 100/250 to find a home for )
notice the protection around the panel ...I have promised myself not to drop or dent this one while working on it

I have just managed to squeeze in big fat Russian PIO caps ,the panel is standard 430 x 300 (17x12) hi-fi size but still seems quite full, I don't know how Tim managed to fit it all in to his 12 x 9 inch chassis.

Well back to work... soon be time to fire up the soldering iron
Attached Images
File Type: jpg 2nd rail.JPG (330.3 KB, 574 views)
File Type: jpg caps.JPG (332.7 KB, 325 views)
File Type: jpg pio.JPG (326.1 KB, 317 views)
__________________
Any Progress is Progress
  Reply With Quote
Old 6th February 2012, 01:00 AM   #30
diyAudio Member
 
Join Date: Nov 2011
Location: Athens
Nice way to fitt the caps , and nice construction too .
  Reply With Quote

Reply


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
OTL designed by Tim Mellow with 4 6C33C? dwhitf Tubes / Valves 293 9th March 2014 10:04 AM
Preamp for Tim Mellow's 6C33C OTL flanagan Tubes / Valves 3 9th November 2010 08:13 PM
Simplest 6080 or 6AS7 OTL Project? Michael Rothacher Tubes / Valves 29 26th August 2010 09:05 PM
10 - 16 ohm project for Atma-Sphere OTL amp j.burtt Multi-Way 2 8th May 2006 06:34 PM


New To Site? Need Help?

All times are GMT. The time now is 05:46 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2