|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
184.6.240.52
In Reply to: RE: Me too... posted by GSH on November 17, 2014 at 14:04:09
GSH,
"What has been claimed many times is that my choice of wire(s) is the prime cause of the "no comparison" status. So tell me, now that y'all
can see them both, how likely is this true? Examine the actual amount
of wire on either example. BTW, I did use solid silver wire from plate to grid, and stranded silver on the OPT, which has a partial silver secondary as well. My large gauge copper less than 6" long ground bus, has been named as a huge problem. It's the white wire in the pic posted by Tre. It goes from the center tap of the LOWER DCR PT (than the Hammond in the other amp) to a point near the input. In DF's build the stock red/yellow CT wire of the Hammond is present and connects to the "very special" silver wire under one of the two wires with the blue heat shrink. This is what Jeff is talking about. No guessing anymore."
Grant, if you maxxed out this amp with all the parts and paid retail, how much do you think it would cost? Give it enough thought to come up with a good honest number.
Thanks,
Jamie
Big speakers and little amps blew my mind!
Follow Ups:
You are asking the wrong person. Grant and his mind set produced a NON-high-performance amp from a proven design.
I just went on line and looked up the caps, got all but one value covered.
You have to realize that all caps play narrow band in energy release ( my words...not bad Dowdylama ?? ) and so, ONLY the best caps are any good at all, and none of them are good enough, and it takes multiples to cover the audio spectrum.
Missing a value, the bypassing caps would seem to run from $97.00 a position ( minimum quality ) to $131 a position, NOT counting the main FILM cap.
There are about six positions I would currently bypass in a monoblock. That means, per monoblock, $485 to $665 for bypassing each monoblock, PLUS the main film caps.
If you do stereo, take $665 times two, or $1310 dollars as bypassing costs. An audio amp usually sells for four times parts cost, so we are up to $5,240 a pair, just to cover the bypassing caps ONLY, which I guarantee you from my listening experiements, are necessary for high performance.
You can always "dreck" stuff, Grant did, I sometimes do. But you are FOOLING yourself on caps, and in audio, unless you compare the cheap ones from Russia - surplus military, to the best made today, you won't really KNOW what you have. It takes money, AND a good system, to make such evaluations. None of the caps are perfect, and only the very best are usable, and THEY play narrow band energy-relase-wise, so, it takes MultiCaps or multiple caps to get it right. Dennis KNOWS all of that very well, Grant didn't understand !!!
Jeff Medwin
Damage control at its finest, or at least the Loudest, Horray! Horray!
Tenacity means you're right, have you noticed? Of course you have.
Hmmmm... You know Jeff, you might be able to program your computer or get some "app" that automatically fires your opinion, multiple times, in opposition to anyone's post that disagrees with your views. Thus silencing the opposing view by sheer repetition and redundancy. We have this (or the attempt) already, but it must be time consuming, and hey, you've got better things to do, than spank morons around who will never "get it". Or can't afford to "get it".
Funny, I was thinking about just that this afternoon after learning that I was wrong about the $5K each situation, it's actually $15K/pair which is $7500 each.
I figured the parts for a PAIR even with EML 2A3s would be somewhere between $3300 and $3800, with a $600 allowance for capacitors EACH. Could be less at OEM pricing and quantity discounts. Since I don't know exactly what caps are used, it's a blurry zone, but $600 is generous, could be less, could be a little more (exchange rates shipping etc..)
Here's my ballpark math:
2 x Hammond PT 350
2 x MQ OPT 400
2 x EML 2A3 630
4 x chokes (those) 100
6 sockets, fuses, switch, jacks, hdware 200 (could be more or Less)
2 x chassis 400 (steel powder coated) seems high
2 Filament trans 60
2 x 5U4GB + 2 x 7B4 50
pile o caps 1200 crazy but probably is
thermistor, RF chokes, "special wire" 150 ? Seems high
Misc + shipping taxes what? 200
Total $3740/2 = $1870 each
I believe it could be done for $100's less depending on a variety of things, not that I'd bother. Even if I believed in this concept, there
are various areas where quality could be improved for LESS $. I understand that in a new manufacturing world you need to be able to source all the parts, usually meaning "in current production". But considering the low numbers of these produced, it could be done with some
superior grade surplus stuff, in limited quantities, of course.
They don't make 7B4's anymore, but there's 1000's of them out there NOS for peanuts. Same with 5U4's. JJ 2A3's would save $100'S too.
Hours go into a build like this, drilling, installing and then soldering.
But if you've done it before even once, and it's just a repeat, then it's MUCH faster. Most of the time in one off DIY builds is decision making!
> I figured the parts for a PAIR even with EML 2A3s would be
> somewhere between $3300 and $3800
Hi, GSH,
You can be on budget if you build 4P1L based SET with filament bias and no cathode bypass capacitor whatsoever.
Look at the links below. Andy Jevans is professional musician, and Ale Moglia - really skilled engineer, so you can trust them. Its a matter of your personal taste if you like such amp or not, but at least you won't have to replicate and waste time and effort on flawed amateur design.
http://www.diyaudio.com/forums/tubes-valves/183329-one-more-4p1l-se-25.html
http://www.bartola.co.uk/valves/tag/4p1l-pse/
The success of your build would not be critically dependent on the placement of 1" of wire or the use of $1.5ks worth of bypass caps.
Sounds surprisingly like competent engineering to me.
Hi LG,
I like Andy's amp design, never heard it, I've made similar before with other tubes. I haven't tried filament bias yet, but perhaps will sometime.
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: