Search found 73 matches

by Laurence
Sat Mar 10, 2012 12:24 pm
Forum: Speakers
Topic: Something stirs in the Undergrowth
Replies: 2802
Views: 1147853

Marvelous.

What frequencies is the oris style front horn covering?

What is that bass? it looks like a pro bass cabinet style but taller.
by Laurence
Sat Mar 10, 2012 12:18 pm
Forum: Everyones Projects
Topic: A 2 or 3-channel SE 'Horn-amp'
Replies: 137
Views: 64772

Good design aims for a decade between -3dB point and final lower bandwidth limit so for the driver so we should design for 2Hz for a final 20Hz -3dB point and that puts us at 400H for the IT!!! Though this is a design aim for non inductive elements I understand the compromises of inductive componen...
by Laurence
Sat Mar 10, 2012 12:10 pm
Forum: Everyones Projects
Topic: j-FET / Triode Phono front-end
Replies: 287
Views: 173877

Just had a thought - Laurence might be onto something... If the Fet/pentode transfer curves curvature doesn't cancel for higher order harmonics then maybe a FET-U/L triode cascode can be tweaked to cancel higher order harmonics? And the compound stage might sound better than the alternatives.... Mu...
by Laurence
Sat Mar 10, 2012 12:01 pm
Forum: Everyones Projects
Topic: 2A3 Monoblocks
Replies: 400
Views: 119401

What about a hybrid half of the bias with auto the other half with fixed. I am fairly certain this was done somewhere on a classic circuit, I thought it was the ST70 but when I just looked it up there is only a 15 ohm resistor on the cathode, which I wouldn't have thought made a difference. But I am...
by Laurence
Sat Mar 10, 2012 11:55 am
Forum: Headphones
Topic: Headphone impedances
Replies: 5
Views: 13053

JamesD wrote:Oh dear I hate doing this...

James
That's fine James, you obviously have a lot more experience of these things, I was only saying what I had picked up. I am still learning many things, and just gave what I had, even if it was found wanting.
by Laurence
Tue Mar 06, 2012 2:54 pm
Forum: Everyones Projects
Topic: 26 10Y KR300BXLS
Replies: 470
Views: 152501

I find the Sovtek 2A3's to be very good and can handle more HT than NOS types. I cant recall where I read it or if its true that they use the plates from the Sovtek 300B...could be complete BS, but I run mine with 300v across them and have run much more without signs of distress. I remember that st...
by Laurence
Tue Mar 06, 2012 2:52 pm
Forum: Headphones
Topic: Headphone impedances
Replies: 5
Views: 13053

The higher impedance is an easier match so generally aim for higher impedance. The classic studio monitor the Sennheiser HD414 open back headphones were adopted wholesale when they came out because of their higher impedance in their day. They are close field monitors for the ears. Absolutely flat re...
by Laurence
Tue Mar 06, 2012 2:44 pm
Forum: General Vinyl
Topic: SP10 Troubles
Replies: 108
Views: 67690

I like the transcriptors; better top end. It's about preferences. No need to get all shirty over it.
by Laurence
Tue Mar 06, 2012 2:41 pm
Forum: Everyones Projects
Topic: j-FET / Triode Phono front-end
Replies: 287
Views: 173877

Is anybody else looking at this thread and at the same time reading what steve is doing with the U/L cascode and wandering when the penny will drop?
by Laurence
Tue Mar 06, 2012 2:38 pm
Forum: New Users
Topic: Another newby!
Replies: 9
Views: 7005

Good to have you on board. :D
by Laurence
Sun Feb 19, 2012 11:50 am
Forum: Your Fave Artists
Topic: Bob Cairns
Replies: 2
Views: 3995

What do you know about the guitar ed? sounds metal strung but very acoustic. Can't tell if the room echo thud which gives the 4th beat all the way through is a hand slap on the guitar or some type of percussion instrument. It says in the write up there is a drummer. Have you been to see him live? ca...
by Laurence
Mon Feb 06, 2012 8:21 pm
Forum: Assorted Stuff
Topic: The Market and emarketting
Replies: 47
Views: 19650

But then, our Greg, I'm getting a sniff here you might have been a plod yourself at one time. Am I mistaken? Correct? Just a hunch of course. Double-whammy!. Greg was a policeman and is now a social worker, but in his case for policeman think George Dixon rather than Gene Hunt. Then I have every re...
by Laurence
Mon Jan 23, 2012 1:02 pm
Forum: Beginners
Topic: 2a3 amp
Replies: 288
Views: 97525

Sorry to say the power supply hasn't the capability to kill a 500v cap connected properly. So either you didn't connect it properly or it was previously damaged. The hash terminal is minus the other two are plus.
by Laurence
Sun Jan 22, 2012 9:14 am
Forum: Everyones Projects
Topic: j-FET / Triode Phono front-end
Replies: 287
Views: 173877

I found this: http://www.platenspeler.com/background/riaa/schema_phonoclone.gif R1 R2 and C1 are what I am looking for. Why this writer has put his HF EQ second is an error right? So it seems with an OPAMP I could just copy that portion I want put it after my 12ax7 RC network and I have a hybrid rig...
by Laurence
Sun Jan 22, 2012 8:52 am
Forum: Everyones Projects
Topic: j-FET / Triode Phono front-end
Replies: 287
Views: 173877

a really good way is a hybrid split: passive on the 75uS and active on the bottom (feedback). that can be made to sound almost indistinguishable from an LCR. always roll the top first, at a lower signal level, then the bottom. you have to keep an eye on the clicks and pops. Now then this sounds lik...