Search found 34 matches

by Steve Kaufman
Sun Aug 15, 2010 3:04 pm
Forum: c3
Topic: will the guys think nickel is yummy?
Replies: 1
Views: 39483

The C3 reunited for the evening to evaluate the 49 and 80% nickel transformers. Johnny and I have been using amorphous core trannies for several years. When we optimized the gaps we found that the gaps required were larger than expected based on the plots. The same occurred this time. For the 80% ni...
by Steve Kaufman
Fri Dec 04, 2009 1:31 am
Forum: Phono
Topic: need any tips?
Replies: 4
Views: 7888

I like the circumcised one.
by Steve Kaufman
Sun Apr 19, 2009 6:29 am
Forum: Transformers
Topic: Mixing DHT and IDH filaments.
Replies: 10
Views: 14490

Tweeters

Hi Romy This is a bit off the subject. As an introduction, you helped me out several years ago with documentation and mounting template for a Micro Seiki tonearm for which I was most grateful. I was recently perusing your informative web site and enjoyed the section on tweeters. I was unaware of the...
by Steve Kaufman
Wed Mar 04, 2009 12:37 am
Forum: sbench 101
Topic: LR Phono Preamp and PS - PC Boards
Replies: 43
Views: 66588

LR phono stage

Hi Steve

I'm just getting around to building the phono stage with the original PCBs and Lundahl iron. Have there been any mods, including those alluded to in the June 6, 2007 post?

Thanks

Steve Kaufman
by Steve Kaufman
Tue Jan 01, 2008 3:38 am
Forum: c3
Topic: adding a tweeter to the Azuras.
Replies: 2
Views: 8783

Hi Guyz There is something to Dave's theory but it is not "spot on." There are possibly some loading effects but the tweeters have a lot to say in their own right. Jonny and I did the Sanders experiment. We compared a couple of tracks with 1. Super tweeters in: 2. Supretweeters out: and 3....
by Steve Kaufman
Sun Aug 19, 2007 11:11 pm
Forum: c3
Topic: SLK 75tl rework...
Replies: 15
Views: 20521

Hi Jeffrey That was surely a nail biter until the last paragraph. I do have more bass control at my house, but my amps go down lower than John's. In his setting both versions of the amps sounded great. John plans to switch to NuForce amps for his amps for the bass cabinets and he will remove the fre...
by Steve Kaufman
Thu Mar 01, 2007 4:17 am
Forum: c3
Topic: be careful with those 75tl's....
Replies: 9
Views: 14791

Thanks, Jeffrey.

Sounds like we're going with the Mundorfs. No problemo! I presume you are happy with the sound.

The lone winger will serve as a backup in case one of my other 75s bite the dust. You'll have a niced matched pair that will fly without wings. Ha ha.


slk
by Steve Kaufman
Mon Feb 26, 2007 10:52 pm
Forum: c3
Topic: be careful with those 75tl's....
Replies: 9
Views: 14791

Hi Jeffrey I just noticed this. I may have a better solution for you. Is the pair you are replacing mine with the winged version? If so I'll trade you the single winged tube from the pair in which one was broken for a matched pair of 75TLs without the wings if that works for you. Glad to hear everyo...
by Steve Kaufman
Fri Feb 09, 2007 6:39 pm
Forum: c3
Topic: SLK 75tl rework...
Replies: 15
Views: 20521

Hi Jeffrey The 10 uF caps are actually made by Industrial Condenser Corp. I have a pair of GE 4 uF caps in my preamp. I don't know if they are Spearinol. The common point is that they are in big old ugly gray rectangular cans. The GEs I had in my 45 amps sounded better that all the others. Why don't...
by Steve Kaufman
Thu Feb 08, 2007 3:09 pm
Forum: c3
Topic: SLK 75tl rework...
Replies: 15
Views: 20521

Hi Jeffrey

What effect did the caps have specifically on the lower end? It would be interesting to hear the effects of the different Mundorfs. I have used both the silver and gold versions and they are pretty good. I never made a direct comparison in a given location, however.

Thanks

Steve
by Steve Kaufman
Tue Feb 06, 2007 5:53 am
Forum: c3
Topic: SLK 75tl rework...
Replies: 15
Views: 20521

Hi Jeffrey Thanks for all the torture, I mean diligent listening. When John reads the post he'll have chest pain! This should be really interesting. My amps only function down to 160Hz. Below that the sound is handled by the small solid state NuForce amps. Me thinks my amps will thrive in that envir...
by Steve Kaufman
Mon Feb 05, 2007 6:08 am
Forum: c3
Topic: SLK 75tl rework...
Replies: 15
Views: 20521

Thanks, Jeffrey. The amps were designed to go down to 100Hz flat and then tail off. There is still significant info at 50 to 60 Hz. It was designed that way because we didn't want to sacrifice any openness in the mids and highs. I look forward to hearing how they do in the "Big Rig." Steve
by Steve Kaufman
Wed Jan 31, 2007 1:33 am
Forum: Phono
Topic: MC stepups.
Replies: 86
Views: 105718

Hi Dave

Peerless step-ups should arrive on Friday.

Steve
by Steve Kaufman
Tue Jan 16, 2007 5:45 am
Forum: c3
Topic: SLK 75tl rework...
Replies: 15
Views: 20521

Hi guys

I agree here too and then some! Jeffrey, please do what you (and Dave) feel is best.

Thanks

Steve
by Steve Kaufman
Sun Mar 19, 2006 11:42 pm
Forum: Phono
Topic: MC stepups.
Replies: 86
Views: 105718

Hi Dave We (Lynn Olson, Thom Mackris, Mr Sanders from Quicksilver amps, Johnny, and me) got together at Johnny's house and compared the different phono stepups. The results were similar to those I reported to you from Friday night. The straight wire 25 turn bobbin sounded the best. The lower dcr ver...
by Steve Kaufman
Sun Feb 05, 2006 7:06 am
Forum: Transformers
Topic: A low turn 5K OT
Replies: 16
Views: 16976

Hi Dave Johnny, Grant and I put the 50:1 output trannies back in my amps. We then compared the 2:1 interstage trannies with the 5K 1:1s. Guess what? The 1:1s sounded much better and more life-like. Grant forgot to bring the 4.2s. We'll plug them in next week. At my place the combination of the 50:1 ...
by Steve Kaufman
Sun Feb 05, 2006 6:48 am
Forum: Phono
Topic: This shield is da bomb.
Replies: 19
Views: 23715

Hi Dave Johnny, Grant and I got together tonight. We compared the "Pipe Bomb," (DCR 1.6K ohms), the "Black Box," (420 ohms), Da Bomb 40T (340 ohms), and "Da Bomb" 50T reduced DCR ( 210 ohms). The order of preference corresponds with DCR. The lower the DCR, the better th...
by Steve Kaufman
Sat Jan 21, 2006 5:46 pm
Forum: Phono
Topic: This shield is da bomb.
Replies: 19
Views: 23715

Hi Dave This certainly beats the original "Pipe Bomb" shipped to DC. Everyone got a kick out of the look. However, I decided to ship it home and avoid jail time. Can't wait to hear the 25 and 100 turn versions in "da bomb." Johnny, Grant and I plan to compare the 50T with the hig...
by Steve Kaufman
Fri Oct 28, 2005 5:04 am
Forum: Phono
Topic: MC stepups.
Replies: 86
Views: 105718

Have you tried Daves stepups with 47.5K loading instead of 7K?
by Steve Kaufman
Thu Oct 27, 2005 4:03 am
Forum: Transformers
Topic: RMAF experiences.
Replies: 1
Views: 4007

Post RMAF

Dave

That was a Sunday to remember! I can't recall seeing so many heads spinning in one room. Now we know that pursuit of the ""rest of the story" with the MC step-ups will make us vinyl junkies very happy.

Thanks for your imagination and energy.

SLK
by Steve Kaufman
Sat Sep 10, 2005 11:24 pm
Forum: sbench 101
Topic: LR Phono pre with Slagle iron
Replies: 14
Views: 24878

Hi Dave and Steve I have sent you both private e-mails about our wishes. We would love to have Steve's phono stage here to share with the Rocky Mountain AudioFest mob, many of whom will be hanging around for the week after the show. Frank Schroder will be staying with us for the week and he has part...
by Steve Kaufman
Mon Aug 15, 2005 11:41 pm
Forum: c3
Topic: initial gap selection
Replies: 10
Views: 14486

Hi Dave

The gaps described were doubled, adding the two sides together. Interesting discussion. Didn't realize the nano cores at $600 were for the chokes! Yikes!

Steve
by Steve Kaufman
Mon Aug 15, 2005 12:23 am
Forum: c3
Topic: initial gap selection
Replies: 10
Views: 14486

Transformer/choke trials

Hi Dave With the various transformers and chokes you sent us recently we attempted to optimize the sound we can obtain by altering the number of windings in the cores and the gap betweent he C-cores. In each case we strive to reach a sweet spot in which the highs are most extended, the midrange and ...
by Steve Kaufman
Thu Aug 11, 2005 4:14 am
Forum: c3
Topic: initial gap selection
Replies: 10
Views: 14486

Hi Dave

The iron arrived in two parcels today. John and I will get down this weekend. Stay tuned!

Thanks

Steve
by Steve Kaufman
Wed Aug 10, 2005 4:27 am
Forum: sbench 101
Topic: LR Phono Preamp and PS - PC Boards
Replies: 43
Views: 66588

Hi Steve

I'd love a large copy of the color rendition for over the fireplace! Impressive work.

Thanks

Steve
by Steve Kaufman
Sun Aug 07, 2005 9:02 pm
Forum: c3
Topic: initial gap selection
Replies: 10
Views: 14486

Dave

There is one more thing I neglected to clarify with you. The "temporary" cores you are sending we figured to be amorphous as the final ones will be. If this is not the case it will create an additional variable. Will they, in fact, be amorphous?

:-O

Steve
by Steve Kaufman
Sun Aug 07, 2005 5:28 pm
Forum: c3
Topic: initial gap selection
Replies: 10
Views: 14486

Hi Dave We're getting pumped about answering all these new questions. James is laying out the four chassis. Before he can order materials he needs to know the dimensions of the footprints of the output and IS trannies as well as the chokes. Would you mind giving me a rough measurement of these when ...
by Steve Kaufman
Sun Aug 07, 2005 5:19 pm
Forum: sbench 101
Topic: LR Phono Preamp and PS - PC Boards
Replies: 43
Views: 66588

Hi Steve Steve here in C3 land! Please count me in for one of each board as soon as they are available. If there any discrepancies from the D3a schematic on the web site please let me know what they might be. Hopefully Dave will be able to get his iron to us soon as well. We'll have a bunch of folks...
by Steve Kaufman
Wed Aug 03, 2005 3:31 am
Forum: c3
Topic: Finishing up some iron
Replies: 1
Views: 6355

Hi Dave

I'm back from Alaska. Thanks for getting everything together. The C3/4 are raring to go. I'll talk to Johnny about those schematics.

Steve
by Steve Kaufman
Wed Mar 30, 2005 4:03 pm
Forum: Inductors
Topic: Three different "80 hy 25ma" plate chokes
Replies: 34
Views: 41189

bob bob bobbin away

Hi Dave John received your bobbins for the output trannies. We listened to the original OPTs with optimized gap and then substituted the new bobbins with fewer windings and narrowed the gap to I believe 0.03". The latter provided a substantial improvement in high frequency and low frequency res...