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Old 12th October 2008, 11:51 PM   #11
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Quote:
Originally posted by Eli Duttman



Klipsch speakers are efficient. However, they seem to do poorly with the modest damping factors available with no NFB SET amps. I suggested Class "A" triode wired PP EL34s, as both sufficient power and adequate damping would be available. A LITTLE loop NFB provides the necessary voice coil control.

I completely agree with you on that. I get a little spoiled with my Klipsch CF-4's. Their neo 12" woofs seem to sound best with a nice loose SET amp, but this is generally not the case. Of course, you could always implement the feedback on a single ended amp, but saying that might get me booted out of here!
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Old 13th October 2008, 06:55 AM   #12
AuroraB is offline AuroraB  Norway
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Quote:
Originally posted by Eli Duttman


Are you based up near Narvik or Hammerfest?

What ? An american(?) with local Norgie knowledege???

Quite right---I'm about 200 km straight line NW of Narvik - on the tip of an island in the Norse Sea ( 69.3 N-16.01 E)........and I quite like it here !
Lots of fresh air and natures own forces ( and trout ponds and lakes!)



As for the amp question... 300Bs and the likes are not for me , - not yet at least. My current speakers are around 89-90......
I play mostly classical, but the odd Cream or Zappa and the likes creeps up in between....
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Old 14th October 2008, 01:28 AM   #13
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Can anyone suggest a nice SE amp some NFB? Schematic with parts list.

50-60 watts. I would like to build a set of monoblocs. I am building a tube pre using two 12AX7s and one 12AU7.
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Old 14th October 2008, 03:12 AM   #14
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Quote:
Originally posted by billbeau
Can anyone suggest a nice SE amp some NFB? Schematic with parts list.

50-60 watts. I would like to build a set of monoblocs. I am building a tube pre using two 12AX7s and one 12AU7.

Dude,

You may not realize it, but you are JESTING. SE amps must be Class "A". The max theoretical efficiency for Class "A" is 50%. In the real world, less than 50% is what you get. For example, 20% efficiency is common, when triodes are employed.

If you want "55" WPC, use UL mode PP KT88s.
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Old 14th October 2008, 04:48 AM   #15
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Exclamation here you go!

qualified by the proviso that you increase your personal risk, death and disability insurance, and speak kindly to your bank manager. After that, you're on your own... http://www.webace.com.au/~electron/tubes/amps.htm
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Old 15th October 2008, 01:26 PM   #16
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Default Hey AuroraB

I just wasted an hour on google earth trying to find your locale (got to love that google earth). Is it Andenes? The B stands for Borealis I figure. My what a beautiful part of the world it must be.. Perfect for a Valve amp I say!!!
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Old 15th October 2008, 04:25 PM   #17
AuroraB is offline AuroraB  Norway
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Default Re: Hey AuroraB

Quote:
Originally posted by duderduderini
I just wasted an hour on google earth trying to find your locale (got to love that google earth). Is it Andenes? The B stands for Borealis I figure. My what a beautiful part of the world it must be.. Perfect for a Valve amp I say!!!
Spot on !

A few links to active web sites in my area - enjoy.....

http://www.whalesafari.no/a/?id=66&vn=738
http://www.andoyturist.no/en/index.html
http://www.bleik.no/
http://www.rocketrange.no/
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Old 16th October 2008, 04:49 AM   #18
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Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.
A little bit back on topic...Getting 50 Watts or so in SE can be done by using transmitter tubes of various types & there is a bit of a fringe group that likens to this genre.
My idea was to build an SE with 45 WPC using the 813 tube. Rather a big tube using very high voltages. I've put it all together on paper but found out an output transformer would run appx. $750 each...
That has slowed down my progress.
High power SE designs are doable but way out there in practicality.
______________________________________Rick........ ..
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Old 16th October 2008, 12:24 PM   #19
AuroraB is offline AuroraB  Norway
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Location: Norway, -north of the moral circle..
40-50W SE will require some rather special and costly transformers, I think.. not what I want to do at this stage.

Even if the thread starter asked for 100Ws, I 'm still interested in what difference there are in different topologies.
I've asked this question before, but really didn't get any conclusive answers. I realize that this is apples and pears to some extent, but i was hoping for some pointers, at least....

These are the links I posted a couple of years ago:

http://www.vacuumstate.com/schematics/pp-1c_s.gif

http://www.pmillett.com/push-pull_k..._driver_pcb.htm

http://www.lundahl.se/claus_b.html

http://home.tele2.fr/boutailh-tan/ampli/ampli.htm

http://www.jogis-roehrenbude.de/Les...auanleitung.htm

Somehow I am leaning towards the last one ( which also have a appx 100w version). The output transformers seems to be of good quality, and are avaialble here:
http://www.roehrentechnik.de/html/gegentakt.html

Unfortunately, tha last ones are only available in german, but schematics are usually language independant,
( aren't they....? )
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Old 16th October 2008, 01:53 PM   #20
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a single ended KT88 in pentode or UL might be the ticket...

I'm running a SE UL EL156 with a pentode driver and I like it quite a bit.
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