6LU8 Push-pull power amp and other builds

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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Sat Feb 21, 2015 11:57 am

5894 SET cum 6GU7/6RHH2 Aikido...

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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Fri Feb 27, 2015 5:09 pm

Norah Jones sounds very sweet playing these combination...

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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Fri Feb 27, 2015 7:27 pm

built using the Russian 6H8C, 6SN7 equivalent...
circuit is a Broskie CCDA implementation using 47k plate/cathode resistors,
and 820 ohm 1st cathode bias resistor..
the 5Z4 rectifier tube was harvested from a Sakura AV200 hybrid amp....

side view,,,
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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Mon Mar 23, 2015 6:49 pm

my new set of tubes, Russian GU-50, with china sockets and power transformer
to make a pp power amp....thanks to my FB friends for the help in acquiring these items...
will design the OPT for use in this amp, B+ at around 700volts....

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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Sat Mar 28, 2015 6:10 pm

the shape of things to come....two rows on the left are OPT's, the rest are power traffos and chokes for upcoming projects...

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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Mon Apr 06, 2015 9:47 am

Easter MOD line amp....another Broskie CCDA line amp, this time using the 4KN8 twin triode tube....
this is a dual mono line amp, the channels each run on their own power supply
completely independent of the other...this is a prototype preamp, not for sale....
btw, this is not an AIKIDO preamp, many of those who bought the little preamp
like the sound of it more than the Aikido, so i made another version, this time
upping it one notch higher....i have at lest 5 notches still running in my head... ;)


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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Thu Apr 09, 2015 2:02 pm

btw, these are the litle amps that was the predecessor to the Easter MOD line amp...

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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Sun Apr 12, 2015 8:19 am

my third 6LU8 amp in 4 years, this time this is going to be a no holds barred,
400v plate, fixed bias and a mulard 5-20ish design....previous designs had tube
longevity as design goal...this build will punish the beam tetrodes section somewhat
and prove what more it can do...

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my second 832 pp amp in a year, as i do not do the same amp the same way,
this is going to be an LTP driven, using the 6D10 triple triode with 12at7 type plates..

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this one is a 5 watt pp amp using the 6DX8 triode pentode tubes in a class A and aikido fromt end..

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these amps are awaiting parts back ordered and will be finished in about 3 months time...
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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Tue Apr 14, 2015 8:25 pm

this one packs more punch....
829 push pull power amp, uses EF80 input pentode and E182CC LTP splitter.....
G2 is regulated and will be fine tuned at around 200 volts....
inspired by the Audioromy FU29, this amp uses bigger irons...

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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Mon Apr 20, 2015 8:57 am

5894 SET and my new 4KN8 CCDA line amp, makes Norah Jone's sings sweetly.... ;)

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Re: 6LU8 Push-pull power amp and other builds

Postby kabubi » Mon Apr 20, 2015 3:42 pm

Bravo, Sir Tony!

I am proud that you are living proof that the Filipino is truly world class in the pursuit of music and sound reproduction.

Keep it coming!
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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Mon Apr 20, 2015 5:52 pm

kabubi wrote:Bravo, Sir Tony!

I am proud that you are living proof that the Filipino is truly world class in the pursuit of music and sound reproduction.

Keep it coming!


i am not worthy, but i try to do my best... :)
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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Sat May 02, 2015 7:26 am

sent this kits to Cebu, a young tube convert wants to start in his own tube journey..

he is building an el84 class a pp amp...

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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Tue May 05, 2015 12:03 pm

another Broskie CCDA line amp this time using the 12SN7 and a type 80 ST rectifier...

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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Thu May 28, 2015 12:53 pm

LOOK MA, NO TUBES........

this is my final hack for the Sakura AV200...get rid of the tubes, we don't need them anymore.......
so don't be afraid if your tubes died out on you, the amp can still run...

program source is my midi player Bread was on deck...

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panasonic 2,2ufd polypropylene cap inserted at pins 2 and 3 on the 6n2 socket...
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first tried out a 10ufd cap but leads are not enough long to fit into tube socket
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a tube ss rectifer can be used also to get rid of the 5z4///
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Tube Exorcism completed....
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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Fri May 29, 2015 8:39 am

Tuesday, May 23 mini eyeball with kabalen's at Angeles City, Pampangga....
we are the audio techies having a mini EB testing power amps as per FTC: watts rms, 1khz, 8ohms dummy load....
Norman Santos is one OFW working in Dubai, who spends his spare time laying out boards,
he is one of the many OFW's spending their time in a very productive way....
you will be delighted to find out that our local techies are now designing ang making their own smps psu's...
the Pinoy talent are all over the earth....
our Pinoy engineers in China produces many consumer electronics products,
i wll not be surprised if your DAC which came from china has the hand of a Pinoy techie
at one point or another...

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left to right, Larry Roxas, Wewe Padilla, Tony Tecson, Jun Mabanta, Kiko Jimenez, Norman Santos, Jun del Mundo

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really feels good to be among peers..... ;) 8)
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Re: 6LU8 Push-pull power amp and other builds

Postby kabubi » Fri May 29, 2015 4:52 pm

uy, kasama niyo si Larry "camotecue" Roxas?
big shot yan sa larangan ng audio!
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Re: 6LU8 Push-pull power amp and other builds

Postby kabubi » Fri May 29, 2015 4:53 pm

Sir Tony,

will you be able to make a DAC?
puede ba DAC na de-tubo?


thanx!
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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Fri May 29, 2015 5:17 pm

kabubi wrote:Sir Tony,

will you be able to make a DAC?
puede ba DAC na de-tubo?


thanx!



unfortunately i can not....i have a brother in singapore, he has a tubalog, da with tubes,matgal na rin, more than 20 years na...
http://www.diyaudio.com/forums/digital- ... balog.html
Last edited by tony on Fri May 29, 2015 7:08 pm, edited 1 time in total.
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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Fri May 29, 2015 5:19 pm

kabubi wrote:uy, kasama niyo si Larry "camotecue" Roxas?
big shot yan sa larangan ng audio!


Larry who? :lol: oh yes, napaka accommodating nya, isang tawag mo lang naroon na sya... :)
eager to meet fellow kabalens.... 8)

all the guys in the picture except me are real techies, experts in their own rights...
and there are more of them, i merely tried to get them together, there will be more of this mini EB in the days ahead...
our long term aspiration is a gathering of local DIY'ers in one place, with only diy projects to be displayed..... 8)
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