ElBirkerio
Joined: Dec 17, 2012
Posts: 519
Vienna
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Posted on Jan 14 2016 01:47 PM
Hi!
After playing tube amps for a while, I went a little further - meet the home-built, single ended 11W Class A Stereo that now powers my old Bang&Olufsen Beovox 2400 ...
Yours Wolfi
— http://www.surfgrammeln-san.org
https://www.facebook.com/BaluUndSurfgrammeln
http://greencookierecords.bandcamp.com/album/coming-out-soon-los-chicharrones-del-surf-10
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caddady
Joined: Feb 14, 2010
Posts: 802
N.E. Ohio
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Posted on Jan 14 2016 03:13 PM
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Badger
Joined: Nov 16, 2013
Posts: 4536
Wisconsin
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Posted on Jan 14 2016 05:29 PM
Beautimous! How's it sound?
— Wes
SoCal ex-pat with a snow shovel
DISCLAIMER: The above is opinion/suggestion only & should not be used for mission planning/navigation, tweaking of instruments, beverage selection, or wardrobe choices.
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ElBirkerio
Joined: Dec 17, 2012
Posts: 519
Vienna
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Posted on Jan 14 2016 11:50 PM
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eddiekatcher
Joined: Mar 14, 2006
Posts: 2775
Atlanta, GA
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Posted on Jan 15 2016 01:18 PM
El-B,
Nice, very nice. Looking at the chassis are you contemplating "push pull?"
ed
— Traditional........speak softly and play through a big blonde amp. Did I mention that I still like big blonde amps?
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ElBirkerio
Joined: Dec 17, 2012
Posts: 519
Vienna
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Posted on Jan 15 2016 05:58 PM
Nice, very nice. Looking at the chassis are you contemplating "push pull?"
Single Ended ... Push Pull ... I am still contemplating getting a green energy Z certificate ;)
But it is a single ended class A amp ...
Yours
Wolfi
— http://www.surfgrammeln-san.org
https://www.facebook.com/BaluUndSurfgrammeln
http://greencookierecords.bandcamp.com/album/coming-out-soon-los-chicharrones-del-surf-10
Last edited: Jan 16, 2016 02:50:50
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ElBirkerio
Joined: Dec 17, 2012
Posts: 519
Vienna
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Posted on Feb 27 2016 05:33 AM
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caddady
Joined: Feb 14, 2010
Posts: 802
N.E. Ohio
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Posted on Feb 27 2016 08:14 AM
Wow those blue lights take me back to the big hi-fi consoles our parents had(with built in reverb). Well done Wolfi. What is this Z certificate you speak of?
— http://www.reverbnation.com/thegreasemonkeyz
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ElBirkerio
Joined: Dec 17, 2012
Posts: 519
Vienna
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Posted on Feb 27 2016 10:03 AM
hi!
the certificate is a joke - in the EU, we have this energy efficacy rating for electrical appliances, but also buildings and so on (https://en.wikipedia.org/wiki/Energy_Performance_Certificate)... A+++ is best and so on ...
given the fact that a class a amp has a degree of efficiency of 6 % - plus the fact that I will now also add a rather pointless circuit with an additional effective draw of ~50 W, I tend to think that this certification process would yield a z--- rating
yours
wolfi
— http://www.surfgrammeln-san.org
https://www.facebook.com/BaluUndSurfgrammeln
http://greencookierecords.bandcamp.com/album/coming-out-soon-los-chicharrones-del-surf-10
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Badger
Joined: Nov 16, 2013
Posts: 4536
Wisconsin
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Posted on Feb 27 2016 06:12 PM
ElBirkerio wrote:
hi!
the certificate is a joke - in the EU, we have this energy efficacy rating for electrical appliances, but also buildings and so on (https://en.wikipedia.org/wiki/Energy_Performance_Certificate)... A+++ is best and so on ...
given the fact that a class a amp has a degree of efficiency of 6 % - plus the fact that I will now also add a rather pointless circuit with an additional effective draw of ~50 W, I tend to think that this certification process would yield a z--- rating
yours
wolfi
It's a thing of beauty anyway. Tell the moral busybodies to pound sand.
— Wes
SoCal ex-pat with a snow shovel
DISCLAIMER: The above is opinion/suggestion only & should not be used for mission planning/navigation, tweaking of instruments, beverage selection, or wardrobe choices.
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ElBirkerio
Joined: Dec 17, 2012
Posts: 519
Vienna
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Posted on Feb 28 2016 04:20 AM
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Badger
Joined: Nov 16, 2013
Posts: 4536
Wisconsin
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Posted on Feb 28 2016 05:22 AM
ElBirkerio wrote:
... there is also another positive sideeffect - the heating cost in my living room is definitely reduced!!!
yours
wolfi
Absolutely! Warm glass is a wonderful thing. Did you develop this circuit yourself, or did you have an online source for the project?
— Wes
SoCal ex-pat with a snow shovel
DISCLAIMER: The above is opinion/suggestion only & should not be used for mission planning/navigation, tweaking of instruments, beverage selection, or wardrobe choices.
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ElBirkerio
Joined: Dec 17, 2012
Posts: 519
Vienna
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Posted on Feb 28 2016 06:02 AM
hi!
no, i did not develop it myself - the amp is a kit from a guy that also made the transformers. however, Class A amps were probably finally developed around 1910 and have changed very little ever since, so there is no black magic in that circuit. the costly part is the transformers. unfortunately, the guy who sent me the boards and transformers was doing a one-man company, and he died suddenly. so wiring the transformer was a bit of a challenge as i had no schematic
the EM84 circuit is from ebay and costs about 5€ - http://www.ebay.at/itm/Magic-Eye-Tube-6E2-EM84-VU-Meter-Audio-Level-Indicator-Board-One-6E2-tube-/131590534397?hash=item1ea36834fd:g:P4UAAOSwsB9WAq1K ...
the power circuit consists of a little toroidal transformer (also from ebay) with 180V AC and 6.3 V / 1.5 A AC. the grid voltage is rectified, goes into the capacitor is further stabilized by a chain of zener-diodes and a FET. the filament voltage is simply rectified without further ado ...
still looking for a tube driven phono-preamp kit - any suggestions :D?
yours
wolfi
— http://www.surfgrammeln-san.org
https://www.facebook.com/BaluUndSurfgrammeln
http://greencookierecords.bandcamp.com/album/coming-out-soon-los-chicharrones-del-surf-10
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Badger
Joined: Nov 16, 2013
Posts: 4536
Wisconsin
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Posted on Feb 28 2016 06:37 AM
Thanks for the info.
No suggestions on the phono pre-amp... maybe someone out there has carved up an old McIntosh into a set of projects.
— Wes
SoCal ex-pat with a snow shovel
DISCLAIMER: The above is opinion/suggestion only & should not be used for mission planning/navigation, tweaking of instruments, beverage selection, or wardrobe choices.
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caddady
Joined: Feb 14, 2010
Posts: 802
N.E. Ohio
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Posted on Feb 28 2016 06:42 AM
Two surfy bear fet amps in a box for a phono pre amp?
— http://www.reverbnation.com/thegreasemonkeyz
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ElBirkerio
Joined: Dec 17, 2012
Posts: 519
Vienna
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Posted on Feb 28 2016 06:46 AM
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