Search found 5599 matches

by simon
Fri Oct 01, 2010 9:11 pm
Forum: Buying and Selling
Topic: Scopes job lot local pick up South West region
Replies: 153
Views: 39302

Mike H wrote:Also, type "oscilloscope tutorial" in Google, I got 123,000 results


I think life is too short to look at all that lot
Mmmm, that's why I wondered if anyone had any recomendations.

Do you think Google got fed up counting at 123,000?
by simon
Thu Sep 30, 2010 8:56 pm
Forum: Speakers
Topic: Supertweeter Filter Fine Tuning
Replies: 12
Views: 6139

I'll try that Mike.

L Pads now ordered.
by simon
Thu Sep 30, 2010 8:43 pm
Forum: Buying and Selling
Topic: Scopes job lot local pick up South West region
Replies: 153
Views: 39302

Mike H wrote:Nuffink on the web takes your fancy? Or you want a real paper one? :D
Can you recommend any good ones for a (scope) numpty? Sort of an ABC for those of us, well me anyway, that doesn't really know how to use a scope?
by simon
Thu Sep 30, 2010 1:18 pm
Forum: Speakers
Topic: Supertweeter Filter Fine Tuning
Replies: 12
Views: 6139

:lol: I wasn't expecting that!

Right, I'll give them a go then chaps. Thanks for the feedback.
by simon
Wed Sep 29, 2010 11:21 pm
Forum: Speakers
Topic: Supertweeter Filter Fine Tuning
Replies: 12
Views: 6139

Supertweeter Filter Fine Tuning

I thought I'd got the filter for my supertwatter just right. I'd spent a long time with various values of capacitor finally settling on 2u2. The L Pad attenuation I worked out from an online calculator and the values seemed to work fine. So I finally soldered it all together instead of having messy ...
by simon
Wed Sep 29, 2010 11:10 pm
Forum: Everyones Projects
Topic: 26 10Y KR300BXLS
Replies: 470
Views: 152508

Ah the eternal 300B debate ~ should it be 2.5k, 3k, 3.5k, 5k, 6.8k ...... This 'ere Madness amp has had 5k amorphous, 2.5k c core and now Bud's 4.545k OPTs. I think quality of the OPT is probably more important. That said Bud is a really interesting guy to correspond with as he talks about minutiae...
by simon
Wed Sep 29, 2010 7:28 pm
Forum: Everyones Projects
Topic: 26 10Y KR300BXLS
Replies: 470
Views: 152508

Honestly we have nothing better to do :D And for that you earn the highest order of recognition "No idea why I do this anymore" 8). In comparison I am simply not worthy. A mere fiddler. These Onetices have 4 hours on them now and I have to say they're very interesting. Detail retrieval is...
by simon
Tue Sep 28, 2010 6:15 pm
Forum: Everyones Projects
Topic: 26 10Y KR300BXLS
Replies: 470
Views: 152508

"plugged the IC back in to the switcher", what's that about then? http://livinginthepast-audioweb.co.uk/kbf/th_scratchhead.gif Er, it's a passive pre I use with the WE91s which I'm also using with Madness so I can easily switch between sources. It was superfluous to the story as I proved ...
by simon
Mon Sep 27, 2010 11:00 pm
Forum: Everyones Projects
Topic: 26 10Y KR300BXLS
Replies: 470
Views: 152508

Yeah, work really gets in the way of my social life. Actually, work for most of the time is life. Oh well. So, update time. I was hoping to have a bit of time this evening to play but work (grrr) saw an end to that. I did find 10 minutes before cooking tea to dig the old sig gen out and follow Capta...
by simon
Sun Sep 26, 2010 6:58 pm
Forum: Everyones Projects
Topic: 26 10Y KR300BXLS
Replies: 470
Views: 152508

Yeah, that's why it's going to be something simple and silly :). And why I first suspected the source. Hmmm.
by simon
Sun Sep 26, 2010 3:39 pm
Forum: Everyones Projects
Topic: 26 10Y KR300BXLS
Replies: 470
Views: 152508

The IT did cross my mind. Voltages look okay but I might have to try replacing with a cap. But why would both ITs go down? :?

Think I've got a signal generator somewhere, but this is getting technical now :D.
by simon
Sun Sep 26, 2010 2:45 pm
Forum: Everyones Projects
Topic: 26 10Y KR300BXLS
Replies: 470
Views: 152508

Tapping the 300B gives a little sound through the speaker, but not the 10Y or 26 as far as I can tell. Putting the meter probe on the anode of each valve produces a little crackle through the speaker. Hmmm. The source works cos I've checked it on a different amp, and touching the first valve's anode...
by simon
Sun Sep 26, 2010 2:30 pm
Forum: Everyones Projects
Topic: 26 10Y KR300BXLS
Replies: 470
Views: 152508

Good idea Steve, I'll try it. I suspect the problem's in the amp somewhere though as I've just connected the sources and switcher in to different amps and they work fine. Before this I fed the grid of the 300B directly from the source and this didn't work either. Back in a bit.
by simon
Sun Sep 26, 2010 1:40 pm
Forum: Everyones Projects
Topic: 26 10Y KR300BXLS
Replies: 470
Views: 152508

Yep, the heaters are on and voltages correct, HT's right as is voltage on top of each valve. It's going to be something very simple and silly I think!
by simon
Sun Sep 26, 2010 11:49 am
Forum: Everyones Projects
Topic: 26 10Y KR300BXLS
Replies: 470
Views: 152508

Don't think so. The amp voltages are fine andthe only change is the OPT secondary ground, unless the earth has gone in both ICs.