Search found 61 matches

by jarek
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...
by jarek
Fri Nov 05, 2010 3:53 am
Forum: Sim City
Topic: 6336B model
Replies: 6
Views: 9040

Steve, you are the guy!
THanks!
by jarek
Wed Nov 03, 2010 4:13 pm
Forum: Sim City
Topic: 6336B model
Replies: 6
Views: 9040

6528

...and 6528 :)
by jarek
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...
by jarek
Thu Nov 24, 2005 7:39 pm
Forum: Pb Place
Topic: Power transformers
Replies: 6
Views: 11588

An air gap and more turns than needed to run the B lower
You are able to lower B so much that you get one quadrant operation? Otherwise whats the sense of the gap? Hot Barcelona air has probably melted my brain...useless anyway.

jk
by jarek
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...
by jarek
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...
by jarek
Thu Sep 15, 2005 1:54 pm
Forum: Transformers
Topic: Ultimate bandlimited SE 801A transformer
Replies: 21
Views: 25658

Czesc Piotr,

thanks for the enlightning info (the paper). It indeed starts as amo and then is partially crystalized - they grow nano-crystals.

Best,
jarek
by jarek
Thu Sep 15, 2005 10:50 am
Forum: Transformers
Topic: Ultimate bandlimited SE 801A transformer
Replies: 21
Views: 25658

The word "nano" is getting thrown around a lot lately, it seems to become more of a marketing tool than an engineering choice. B_sat at 1.1-1.2T, coerction as small as with supermalloy, can be custom tailored to very low B_r, giving nice flat narrow loop. the notion of initial and max per...
by jarek
Wed Sep 14, 2005 11:34 am
Forum: Transformers
Topic: Ultimate bandlimited SE 801A transformer
Replies: 21
Views: 25658

Think $600 for a set of namglas cores for treble outputs. (approx 5cm square cross section double C core "shell" configuration) sweet jesus...i guess you are talking about nano namglas 4? what´s the mass of such cores, i.e. price per kg? besides, with such a baby its a shame to go cut co...
by jarek
Sat Jun 11, 2005 1:22 am
Forum: Pb Place
Topic: Trying Dave's odd ideas about transformer coupling methods
Replies: 11
Views: 24270

Hi Steve,
The no R no C circuit has no such resonance.
But nothing comes without a price - LR would tend to have lower efficiency in ripple reduction due to 1st order filtering.

3 phase a la Thomas looks like a perfect match, so 3 phase thyratron supply anyone?

jarek
by jarek
Thu Jun 09, 2005 6:26 pm
Forum: Pb Place
Topic: Yorkshire Boatanchor event
Replies: 28
Views: 37162

Paul,

you connect in series if you need higher PIV; you connect in parallel if you need higher current.

Best,
jarek
by jarek
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...
by jarek
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...
by jarek
Thu Jun 09, 2005 1:33 pm
Forum: Pb Place
Topic: Yorkshire Boatanchor event
Replies: 28
Views: 37162

well, gm is about 3.5m only, but still those tantalum plates...

jarek
by jarek
Wed Jun 08, 2005 8:52 pm
Forum: Pb Place
Topic: Yorkshire Boatanchor event
Replies: 28
Views: 37162

One more shunt tube idea: T150-1. I remember seeing those babes in Warsaw and was impressed by the looks - cool tantalum plate! Should be ok up to 1.2kV, but high current rather.

-jarek
by jarek
Wed Jun 08, 2005 10:41 am
Forum: Pb Place
Topic: Yorkshire Boatanchor event
Replies: 28
Views: 37162

you too are a big help, and also it's nice to have someone to talk to about it when Dave was busy probably in his day job.
I think he rather sleeps at that time. Anyway, thanks for the invitation!

-jarek
by jarek
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...
by jarek
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...
by jarek
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...
by jarek
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...
by jarek
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...
by jarek
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 ...
by jarek
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 ...
by jarek
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...
by jarek
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...
by jarek
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...
by jarek
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...
by jarek
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...
by jarek
Thu Feb 17, 2005 4:30 pm
Forum: Your name here.
Topic: Hello to everybody!
Replies: 4
Views: 7829

I thought you rather listen than talk... :wink: