Search found 15788 matches

by Nick
Mon Jun 04, 2007 8:24 pm
Forum: Everyones Projects
Topic: DTBs 6B4G
Replies: 361
Views: 222454

This is what I had suggested Dave builds. Its very similar to the circuit originally posted by James.

Image
by Nick
Mon Jun 04, 2007 2:58 pm
Forum: Everyones Projects
Topic: DTBs 6B4G
Replies: 361
Views: 222454

Yes, that generates the bias voltage for the valve. It will be passing about 60ma, and creating about 45v, so you might get away with 63v, but 100v might be better.
by Nick
Sun Jun 03, 2007 10:02 pm
Forum: Everyones Projects
Topic: Darren 212 / 833 SE amp
Replies: 109
Views: 97587

Due to limitations of my current output trans I run at 730v 140ma which is around 40-50W output.
You know, thats a nice place to work at, not high enough voltage to start making things hard, not excessivly high current, and a goodly amount of power.
by Nick
Sun Jun 03, 2007 9:59 pm
Forum: Headphones
Topic: what Headphone amp do you have
Replies: 105
Views: 140669

I should pay attention here. I use headphones at work, and I keep thinking about building an amplifer to use there. So I shall watch with interest to those that have gone before :-).
by Nick
Sun Jun 03, 2007 8:55 pm
Forum: Everyones Projects
Topic: Darren 212 / 833 SE amp
Replies: 109
Views: 97587

very impressive looking bottles.
More a demijohn :-).
by Nick
Sun Jun 03, 2007 7:49 pm
Forum: Everyones Projects
Topic: Darren 212 / 833 SE amp
Replies: 109
Views: 97587

Just so you can sleep at night Nick there are now no clip leads in the HT. All soldered joints. That a relief, I was running out of fingernails :-) What I want' to know is why we always end up doing this stuff in the summer. Winter should be 212, GM70 and now 833's, summer should be 45's and the li...
by Nick
Sun Jun 03, 2007 9:45 am
Forum: News
Topic: Headphone amp section
Replies: 2
Views: 5646

There you go :-)
by Nick
Fri Jun 01, 2007 11:42 pm
Forum: News
Topic: Welcome to Audio Talk
Replies: 62
Views: 166651

Ahh well, it won't be the first time I was talking tosh :-).
by Nick
Fri Jun 01, 2007 9:55 am
Forum: Everyones Projects
Topic: Darren 212 / 833 SE amp
Replies: 109
Views: 97587

The feedback link will be for the regulation. Its so you can apply the point the supply regulates at remote from the box. ie. you run the leads to the thing being powered, then run a lead from the feedback to the end of the leads. That way it will compensate for the losses in the leads. I would gues...
by Nick
Thu May 31, 2007 8:24 pm
Forum: Everyones Projects
Topic: Darren 212 / 833 SE amp
Replies: 109
Views: 97587

Not to worry, I will get around to it myself some time. I should have done that before suggesting someone else tried anyway.
by Nick
Thu May 31, 2007 4:26 pm
Forum: Everyones Projects
Topic: Darren 212 / 833 SE amp
Replies: 109
Views: 97587

Its not working becuae there is no path to ground from the cathode. only connect one end of the interstage to one end of the cathode, the other end of the interstage to 0v, and the fill supply as before with no connection to anything else. Like this: http://www.lurcher.org/nick/images/833_draw.jpg
by Nick
Thu May 31, 2007 1:07 pm
Forum: News
Topic: Welcome to Audio Talk
Replies: 62
Views: 166651

I would try the change first, I wonder if the path through to tha cathode could be part of the problem thats causing the instability.
by Nick
Thu May 31, 2007 9:35 am
Forum: News
Topic: Welcome to Audio Talk
Replies: 62
Views: 166651

Simon, have you tried that small change I suggested with the VR tube current path?

I know it helped in the case of the driver I was using.
by Nick
Wed May 30, 2007 10:15 pm
Forum: News
Topic: Welcome to Audio Talk
Replies: 62
Views: 166651

Thats alright Paul, I am used to reading creative typing, I do enough myself. My worst problem, is the definite article always comes out a teh.

I found I am not alone http://en.wikipedia.org/wiki/Teh
by Nick
Wed May 30, 2007 10:10 pm
Forum: Everyones Projects
Topic: DTBs 6B4G
Replies: 361
Views: 222454

Great, that seems a good price.

Certainly simpiler (and cheaper) than my capacitor array :-).