Search found 61 matches
- Wed Mar 09, 2011 3:57 pm
- Forum: Phono
- Topic: BIG nano core SUT challenge
- Replies: 2
- Views: 6121
BIG nano core SUT challenge
hey dave and others! after few dark ages i'm back to the audio obsession, with an assault on the pussyfied EAR 834 to begin with. i'm on a search for a challenging SUT. i have some +/- fuzzy ideas and a source of cores to explore. i'm looking for somebody willing to wind and experiment :) here are s...
- Fri Nov 05, 2010 3:53 am
- Forum: Sim City
- Topic: 6336B model
- Replies: 6
- Views: 9040
- Wed Nov 03, 2010 4:13 pm
- Forum: Sim City
- Topic: 6336B model
- Replies: 6
- Views: 9040
6528
...and 6528
- Wed Nov 03, 2010 1:58 pm
- Forum: Sim City
- Topic: 6336B model
- Replies: 6
- Views: 9040
6336B model
Hi all! Been long time since posted here :) ...anybody has a reliable model of 6336B? Esp. for high volatge/low current? One section (30W) I've found something here: http://www.ne.jp/asahi/evo/amp/CSPP/6336.htm (scroll down to about 3/4 or search for "spice" on the page) but I think it's f...
- Thu Nov 24, 2005 7:39 pm
- Forum: Pb Place
- Topic: Power transformers
- Replies: 6
- Views: 11588
- Fri Sep 16, 2005 10:23 am
- Forum: Transformers
- Topic: Ultimate bandlimited SE 801A transformer
- Replies: 21
- Views: 25658
i seem to remember having this conversatiopn before :oops: i also got a feeling that i started repeating myself, so probably i should just shut up and learn more any guesses how they vary the perm?? Do you think someone might already have a patent on the idea?? the only bit of info i got from the f...
- Thu Sep 15, 2005 3:49 pm
- Forum: Transformers
- Topic: Ultimate bandlimited SE 801A transformer
- Replies: 21
- Views: 25658
But from memory, several different references state that all nano starts out as amorphous me arrogant asshole, mea culpa... they do start from amo and then anneal it with high field to grow crystals in da tape. apart from piotrek´s ref, here is one more: http://www.wtec.org/loyola/nano/US.Review/0...
- Thu Sep 15, 2005 1:54 pm
- Forum: Transformers
- Topic: Ultimate bandlimited SE 801A transformer
- Replies: 21
- Views: 25658
- Thu Sep 15, 2005 10:50 am
- Forum: Transformers
- Topic: Ultimate bandlimited SE 801A transformer
- Replies: 21
- Views: 25658
- Wed Sep 14, 2005 11:34 am
- Forum: Transformers
- Topic: Ultimate bandlimited SE 801A transformer
- Replies: 21
- Views: 25658
- Sat Jun 11, 2005 1:22 am
- Forum: Pb Place
- Topic: Trying Dave's odd ideas about transformer coupling methods
- Replies: 11
- Views: 24270
- Thu Jun 09, 2005 6:26 pm
- Forum: Pb Place
- Topic: Yorkshire Boatanchor event
- Replies: 28
- Views: 37162
- Thu Jun 09, 2005 2:54 pm
- Forum: Pb Place
- Topic: Yorkshire Boatanchor event
- Replies: 28
- Views: 37162
CLR
Paul, re clr shunt supply, I was having the same thoughts: is C input better here due to its worse load characteristics? Is using HV diodes better than MV due to their higher R? I eventually came up with a negative answers to both questions: in both cases the equivalent series resistance is nonlinea...
- Thu Jun 09, 2005 1:41 pm
- Forum: Pb Place
- Topic: Power transformers
- Replies: 6
- Views: 11588
I have spent considerable amount of time on that myself when designing my iron. What I used was low loss 0.35mm EI150N lamination. The norm for those lams says Bsat=1.7T but I stayed at 1.2T-1.3T max depending on transformer (the bigger the power the lower the B). For the wire I was trying to stay a...
- Thu Jun 09, 2005 1:33 pm
- Forum: Pb Place
- Topic: Yorkshire Boatanchor event
- Replies: 28
- Views: 37162
- Wed Jun 08, 2005 8:52 pm
- Forum: Pb Place
- Topic: Yorkshire Boatanchor event
- Replies: 28
- Views: 37162
- Wed Jun 08, 2005 10:41 am
- Forum: Pb Place
- Topic: Yorkshire Boatanchor event
- Replies: 28
- Views: 37162
- Tue Jun 07, 2005 3:48 pm
- Forum: Pb Place
- Topic: Yorkshire Boatanchor event
- Replies: 28
- Views: 37162
at 90mA gm is stated to be 5, gives ideal Rout=200Ohm, which is equivalent to 8uF cap on 100Hz. Given the quality it's a good tradeoff I'd say. It has the benefit of the extra dissipation 350w if used below 100mcs... This is a good point. As I see it, for the safety of operation shunt should be abl...
- Tue Jun 07, 2005 12:23 pm
- Forum: Pb Place
- Topic: Yorkshire Boatanchor event
- Replies: 28
- Views: 37162
What Vry means is that because you are only inetrested in tweeter frequencies the air cap coupling inside the amp (or perhaps a pair) has sufficient pass point. You can of course tune if you get air variable caps. Maybe a vacuum cap and an air variable in parallel if more required than is available...
- Tue Jun 07, 2005 8:34 am
- Forum: Pb Place
- Topic: Yorkshire Boatanchor event
- Replies: 28
- Views: 37162
Yo Paul, Vry's mathematician? He has never told me that...The idea of air cores is just great - worth separating the freq. into channels, IMHO (look at my plan on the other forum). Air caps - the aviable sizes good only for RIAA pre. Take a look at Ebay on Russian vacuum caps - they have copper stru...
- Mon Jun 06, 2005 7:00 pm
- Forum: Pb Place
- Topic: Yorkshire Boatanchor event
- Replies: 28
- Views: 37162
Then comes the problem with chokes. The higher the gm of the shunt element the less Hy's you would need to achieve the same filtering efficiency (disregarding the fact that the stroed energy is also lower), but at the high voltages the choices are limited. 450th with Rout=200Ohm, say, is equivalent...
- Sat Apr 23, 2005 10:58 am
- Forum: Inductors
- Topic: Three different "80 hy 25ma" plate chokes
- Replies: 34
- Views: 39101
Guys, I'm sorry - didn't want to hijack the thread. Please let me suggest one more thing and I shut up. 200R to 50R this makes me wonder if the DCR is the cause or merely a symptom. I tried to treat DCR as a cause and crashed for 100th time, so I begin hesitate too. What would clear the things out i...
- Thu Apr 21, 2005 6:18 pm
- Forum: Inductors
- Topic: Three different "80 hy 25ma" plate chokes
- Replies: 34
- Views: 39101
I'm sorry for interrupting the fascinating discussion, but I wanted to call your attention to some standard, textbook knowledge :twisted: For a tranny driven by a low impedance source (Rp<<RL) the approximate picture is that the core is driven by voltage so by B. Then due to the loop the current in ...
- Wed Apr 20, 2005 6:24 pm
- Forum: Transformers
- Topic: Bass only SE OPT on AMCC1000...
- Replies: 15
- Views: 14405
Hi Shine, The woofers in question are Lambda 'coustics, and quite lovely as lower mids too. I intend to x/o at 200 or 250Hz 1st order, so sonics are important... 3 and a half octaves justifies a 4212, methinks. Depends on the wallet :wink: I ran into 304tl thinking about a possible bass amp for PSE ...
- Wed Apr 20, 2005 9:05 am
- Forum: Transformers
- Topic: Bass only SE OPT on AMCC1000...
- Replies: 15
- Views: 14405
Shine, another thought - do you really need those 20Hz? If you look speaker-wise then something that decently reproduces 20Hz would not go much beyond 100-150Hz. In this region due to sizes of the elements involved the best seems to be active X/O, so you'd need an amp for just 20-100Hz...pitty to us...
- Tue Apr 19, 2005 5:17 pm
- Forum: Transformers
- Topic: Bass only SE OPT on AMCC1000...
- Replies: 15
- Views: 14405
and it appears that 100hy @ 130ma is where you are best with this core size. if you reffer to shine's AMCC1000 then more could be squeezed at the expence of DCR, say 2mm gap (AL=2), 9500 turns => 180H/130mA ? with my AMCC800A, indeed 80H/180mA for fullrange is more of a wishfull thinking. I guess 5...
- Tue Apr 19, 2005 4:24 pm
- Forum: Transformers
- Topic: Push-Pull transformers and gaps.
- Replies: 19
- Views: 22613
Make the BH loop a BH line Smile an airgap goes a long way to do this. I don;t see its necessary to go to the extreme with an aircore, but using low loss cores with large airgaps seems like a good compromise. Take a core with a perm of 1000 and gap it to get 100 and people will say you are throwing...
- Tue Apr 19, 2005 1:56 pm
- Forum: Transformers
- Topic: Bass only SE OPT on AMCC1000...
- Replies: 15
- Views: 14405
Incidentally, how do the mag curves get modified with twice the core area? Multiply the inductance factor A_L by 2. It should give a good approx. at least till the roll-off of the A_L curves (saturation, so you don't want to be there anyway). What I was usually doing is to guess the gap, take 2x th...
- Wed Mar 16, 2005 1:50 pm
- Forum: Your name here.
- Topic: 304tl project
- Replies: 2
- Views: 6715
Hi Paul, have you published somewhere on the web the results of the blind test, you presented once on GM70 board? I'd link there. If not, we could publish them on 304tl pages as a separate subpage. Besides if you are interested in some NOS Cu GM70 I might be able to help (apologies for that advertis...
- Thu Feb 17, 2005 4:30 pm
- Forum: Your name here.
- Topic: Hello to everybody!
- Replies: 4
- Views: 7829