Search found 10585 matches

by Cressy Snr
Wed Jul 11, 2007 10:05 pm
Forum: Everyones Projects
Topic: EL509 OTL Amplifier
Replies: 83
Views: 79276

Aww come on lads; you know me better than that. :D The aluminium plates are actually subchassis sections which facilitate the modular construction technique. They will be stood off the underside of a varnished birch top plate and the valves will poke up through the wooden surface with sufficient spa...
by Cressy Snr
Wed Jul 11, 2007 5:22 pm
Forum: Everyones Projects
Topic: EL509 OTL Amplifier
Replies: 83
Views: 79276

So now we have heaters! http://homepage.mac.com/scress1958/.Pictures/OTLhtr.jpg The driver stage heaters have been wired up and the whole thing tested with raw AC from the 20V heater transformer. http://homepage.mac.com/scress1958/.Pictures/OTLvolts.jpg The rig has been on soak test for the past thr...
by Cressy Snr
Wed Jul 11, 2007 10:23 am
Forum: Assorted Stuff
Topic: safety and speed of operating systems nick?
Replies: 84
Views: 62486

Well that's the first time I've seen the Windows OS product range and the Microsoft Windows EULA described like that :D Don't get me started on the Microsoft Windows server convoluted licensing crap. When I was IT coordinator at my previous school we had to include the Key Stage One Macs in our seat...
by Cressy Snr
Tue Jul 10, 2007 10:40 pm
Forum: Everyones Projects
Topic: EL509 OTL Amplifier
Replies: 83
Views: 79276

The output stage module is completed

Image

Input/driver stage is next on the list.
Steve
by Cressy Snr
Tue Jul 10, 2007 11:12 am
Forum: Assorted Stuff
Topic: safety and speed of operating systems nick?
Replies: 84
Views: 62486

Linux can be a bit geeky but it is well worth persevering with. Once you get it working it just keeps going with very little need to even shut down the machine. I have to come back to that a bit. Having set up multiple boots on a mac thats not that much fun either, and Darren has tried to use a USB...
by Cressy Snr
Tue Jul 10, 2007 8:43 am
Forum: Assorted Stuff
Topic: safety and speed of operating systems nick?
Replies: 84
Views: 62486

Here is Ubuntu running on my MacBook pro. It is a nice OS and very secure. As Nick says there is no need for antivirus software. The system gets out of the way and allows the operator to simply get on with what they want to do. http://homepage.mac.com/scress1958/.Pictures/screen.jpg One small proble...
by Cressy Snr
Mon Jul 09, 2007 10:50 pm
Forum: Everyones Projects
Topic: EL509 OTL Amplifier
Replies: 83
Views: 79276

Well I've gotten started on the OTL. I've decided to take a modular approach to the build. This means that each bit can be built and tested before putting it into the finished circuit. I don't want any spectacular stuff when I fire it up. http://homepage.mac.com/scress1958/.Pictures/OTL6.jpg The fir...
by Cressy Snr
Mon Jul 09, 2007 9:11 am
Forum: Assorted Stuff
Topic: safety and speed of operating systems nick?
Replies: 84
Views: 62486

I would have tought there wound be an option to make the ubuntu install format the disk partition and start from scratch. If you can get the CD to boot up to it's desktop then it does give the option to partition the hard drive during the installation process. You can do all the usual stuff like pi...
by Cressy Snr
Sun Jul 08, 2007 9:57 pm
Forum: Assorted Stuff
Topic: safety and speed of operating systems nick?
Replies: 84
Views: 62486

Hi Paul You may think the machine has hung but it might not have. You get the Ubuntu logo then are asked to choose install or boot plus a list of other stuff. Just hit enter which means you have chosento boot. You should get a bit of text going past then a black screen. The black screen lasts for se...
by Cressy Snr
Sun Jul 08, 2007 3:27 pm
Forum: Assorted Stuff
Topic: safety and speed of operating systems nick?
Replies: 84
Views: 62486

Hi Paul I would suggest getting a Mac but this would involve buying new hardware With your existing hardware Ubuntu Linux is one of the best Linux distributions for the home/smal business user. You get OpenOffice free with the installation, which should take care of all your office needs including a...
by Cressy Snr
Fri Jul 06, 2007 3:35 pm
Forum: Everyones Projects
Topic: EL509 OTL Amplifier
Replies: 83
Views: 79276

Thats a mighty big TX you have there steve for the bias supply. What current are you expecting to provide? Exactly Nick.:wink: It was the only one I could find in my box with the right output voltage and cheapskate that I am I thought I might as well make use of it. It is a bit big but it'll do for...
by Cressy Snr
Fri Jul 06, 2007 1:27 pm
Forum: Everyones Projects
Topic: Nicks Aikido 300b amp
Replies: 45
Views: 46405

simon wrote:Which reminds me, I should start a thread about the ECL82 spud amp.
Definitely Simon

The more construction threads we get going on here the better. There seems to be a bit more of a constructive (forgive the pun) atmosphere on here than the WD forum at the moment.

Steve
by Cressy Snr
Fri Jul 06, 2007 1:18 pm
Forum: Everyones Projects
Topic: EL509 OTL Amplifier
Replies: 83
Views: 79276

Changed my mind now.

Image

This looks better and I reckon the 12ax7 is still far enough from the mains transformer.

6C33s like those Joule Electras?

"Throw the switch Ygor"

"Yes Master" :D
by Cressy Snr
Fri Jul 06, 2007 12:38 pm
Forum: Everyones Projects
Topic: EL509 OTL Amplifier
Replies: 83
Views: 79276

OK After a bit of thinking in engineering rather than visual terms I came up with this alternative layout. Not quite as visually appealing but it places the input valve (12AX7) as far away from the power supply as possible http://homepage.mac.com/scress1958/.Pictures/OTL3.jpg Andrew, the heat put ou...
by Cressy Snr
Thu Jul 05, 2007 2:04 pm
Forum: Everyones Projects
Topic: EL509 OTL Amplifier
Replies: 83
Views: 79276

Right it seems to be working now Sorry about that. Here is a pic of the preliminary layout of the OTL amp At the rear is the mains transformer, which supplies the driver and output stage B+ The middle transformer is for the series heater chain The front transformer is the negative bias supply. http:...