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Old 21st October 2006, 11:14 PM   #511
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Thats a pretty large beam engine! Grinding rust off something like that is an honor!

Union Pacific has the largest steam engine in the world still in operation. Its the 3985. Its undergoing a two year re-build of the main driving wheels and all bushings and bearings. It should be back in action the summer after next. By itself it can pull a 3000 ton train just like nothing at nearly 70 mph!
Challenger 3985

Now back to our pre-empted KSA-100 thread!

Mark
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Old 21st October 2006, 11:18 PM   #512
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by Mark A. Gulbrandsen
Zen mod... I have some old tube theater stuff in the garage but
I only have several spare hours per year and I prefer to use those to hang out here... At the Union Pacific Steam Shops in Cheyenne, WY.... Once you mess around with the really big boys toys there's no going back! Being around these big locos makes me wish I still had my Nagra Stereo and Altec tube mics.... .

Mark
when I was a kid-I was used to drive in trains in certain Mountain part of my country where my Pa is born,and where I go every year at my Grand Ma place for two months..... few times I have opportunity to drive in train with old steam loco ( emergency helper for "where's da bloody diesel loco now?")........I still remember smell and odour of ancient Mother- like beast.......
in that part of country then were alive not just few steam loco legends....ya know-regular stuff about illegal pull competitions......
those were days hehe ,and we -kids- used to call these trains "Cowboy" ones ........
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Old 22nd October 2006, 12:58 AM   #513
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And another Krell Klone is born! The board is working fine at +/- 24 volts. Voltage across the 75 ohm driver resistors can be varied from .5 to 1.3 volts DC by turning the bias control.

Just to show you how good this thing is the scope is displaying a 100 HZ square wave.

Mark
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Old 22nd October 2006, 01:00 AM   #514
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It also does sine waves pretty well too 1khz. I think PWatts deserves a job well done in this board!!!

The plan is to strip out a Cerwin Vega A-2200 Sensurround power amp that I have abnd build it into a Class AB KSA-100. With the addition of a fan on each heatsink I could probably take it into class A or very close.

Mark
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Old 22nd October 2006, 01:19 AM   #515
VT67 is offline VT67  Belgium
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Mark, it looks like you're really on a mission here!

Regards
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Old 22nd October 2006, 02:07 AM   #516
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Ues, I have to get one channel buil;t and ruinning so we know its ok to proceed with the Group Buy.....

MArk
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Old 22nd October 2006, 02:55 AM   #517
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Quote:
Originally posted by Mark A. Gulbrandsen
Ues, I have to get one channel buil;t and ruinning so we know its ok to proceed with the Group Buy.....

MArk

seems that's time for sleep for more then few of us..........more and more typoooooooooosssssssssssss......


zEnn moD...........
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Old 22nd October 2006, 03:07 AM   #518
BillWW is offline BillWW  United States
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Default ksa-100

Quote:
Originally posted by Mark A. Gulbrandsen
And another Krell Klone is born! The board is working fine at +/- 24 volts. Voltage across the 75 ohm driver resistors can be varied from .5 to 1.3 volts DC by turning the bias control.

Just to show you how good this thing is the scope is displaying a 100 HZ square wave.

Mark
You really know how to distract me from my schooling!

I will some how have to make time to listen to it when you get it going on a weekend or something. But I would only be able to spare maybe 2 hours and get back to assignments.

Bill

P.S. but I can tell you Todd and I are following this amp closely.
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Old 22nd October 2006, 03:19 AM   #519
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Default Re: ksa-100

Quote:
Originally posted by BillWW


You really know how to distract me from my schooling!
...........................

hehe
I just started to ask Mark how's going with Bill's schooling.......

anyway-enjoy in lurking
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Old 22nd October 2006, 05:59 AM   #520
BillWW is offline BillWW  United States
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Default Re: Re: ksa-100

Quote:
Originally posted by Zen Mod



hehe
I just started to ask Mark how's going with Bill's schooling.......

anyway-enjoy in lurking
Zenomod or what ever your name is this week. That was a good laugh, while doing homework reading that on this thread.

Schooling is going well, grade wise in spite of being so busy. Lowest grade so far was 88 percent. If I keep my grades the same as the 1st half of the semester, I should end up with all A's by December. Clinicals in the hospital are fun for me. I feel like I am finally getting somewhere in life careerwise.

But, I really miss building amps and hanging out over at Mark's with LuckyLyndon. I do glance at the threads at least once a week to see what is going on.

I anticipate having a marathon fix during my 2 or so week break between semesters to build at least one or two amps to survive listening until summer. I miss my decommissioned Aleph 3 that I used for the mini Aleph jfet project. I am stuck with no bass with the mini until most likely December and then some amp will start during my break!

Bill
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