6LU8 Push-pull power amp and other builds

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

Postby tony » Fri Oct 25, 2013 6:42 am

not exactly integrated, this is my LM3875TF gainclone build, based on the audiosector boards...
signal source is an MD player feeding a Broskie CCDA preamp, and the gainclone power amp...

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

Postby tony » Mon Dec 23, 2013 8:11 am

inspired by the Marantz 9 monoblocks, i was asked to do two sets of parallel push-pull EL34 power amp...

17 x 14 x 2 1/2 aluminum chassis for the power amps...

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12 x 8 x 2 aluminum chassis for preamps...

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16 off JJ EL34 tubes..
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4 off A631 clone OPT's..

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2 off power traffos, 1 3/4 x 3 inch stack....

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

Postby quarterback » Mon Dec 23, 2013 1:37 pm

tony wrote:this is my latest DIY power cable...

power cord from ROKS in Raon, 3 core x AWG#14 cores purchased for 85 pesos..
then group buy over at elab.ph, for the OYAIDE Elec. male plugs and EIC plug at 241 pesos a pair...
ferrite tube heatshrinked over... 8)

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Hi Tony!

Where can I buy oyaide plug and eic. I need four pairs. Thanks and Merry Christmas!
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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Tue Dec 24, 2013 4:44 pm

^ got mine from a group-buy over at elab.ph, http://www.elab.ph/forum/index.php?topi ... g804758....
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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Tue Jan 28, 2014 6:37 pm

this is an EL34 Parallel push-pull amp inspired by the Marantz 9 with a Mulard 5-20 twist....

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

Postby tony » Tue Feb 04, 2014 7:02 am

coming soon.....
this is a class AB2 6550 pp amp....

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

Postby tony » Wed Feb 05, 2014 1:56 pm

this amp is moving to a new home..... ;)

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

Postby tony » Wed Mar 05, 2014 7:06 pm

mechanical completion...
tweaking and testing follows...

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

Postby nicole » Wed Mar 05, 2014 10:04 pm

:clap: :call: :call: :call: :call: .Nice Amps Sir.. Testing & Commissioning na..
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Re: 6LU8 Push-pull power amp and other builds

Postby Majorkonig » Thu Mar 06, 2014 6:01 am

ok to sir tony. how many watts per channel po ung black and yellow chasis?
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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Thu Mar 06, 2014 6:06 am

nicole wrote::clap: :call: :call: :call: :call: .Nice Amps Sir.. Testing & Commissioning na..


thanks Nicole.... :)
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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Thu Mar 06, 2014 6:06 am

Majorkonig wrote:ok to sir tony. how many watts per channel po ung black and yellow chasis?


70 watts per channel into 8 or 4 ohm.....
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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Sun Mar 09, 2014 1:49 pm

this is my 12W6 pp amp, the output tubes are a dollar each at Rogalskie's in Florida,
topology is like a mulard 5-20, but uses a 12at7 input and 5965 LTP's..
operated as a beam pentode with G2 regulation using an 0A2 gas regulator tube..
more than generous filtering in the power supply....

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

Postby nicole » Sun Mar 09, 2014 4:26 pm

Nice amp.. Congrats!


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

Postby jevtagalog » Mon Mar 10, 2014 7:49 am

wow!!! amp yan boss tony!
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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Mon Mar 10, 2014 12:18 pm

the amp will be at Buknoy's place this weekend, pm nyo na lang if you want to hear the amp
paired with an Audio Nirvana and Mark Audio FR's...
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Re: 6LU8 Push-pull power amp and other builds

Postby buknoy » Tue Mar 11, 2014 10:43 pm

tony wrote:the amp will be at Buknoy's place this weekend, pm nyo na lang if you want to hear the amp
paired with an Audio Nirvana and Mark Audio FR's...

it will be another great flavor coming from a great cook :clap:
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Re: 6LU8 Push-pull power amp and other builds

Postby tony » Thu Mar 20, 2014 9:50 am

the amp is now with me to fix some issues...

gain is way too high so took care of that,
the 0A2 regulator blinks, a sign that is it is
running out of current on music peaks,
took care of that too..
noticed that one sylvania 12W6 red plates at 15volts bias,
so i replaced the entire set with RCA 12EN6's,
no more red plates....

the current setup now is, 12EN6 output tubes, 5814 long tail pair phase inverter,
and 12AV7 as input tube....although the JJ 12at7 and siblings had more gain and decent sound,
i found out that 12AV7 is even better in that spot, perhaps because the 12AV7 has lower rp than the
12at7.....so i am working the amp real hard now.....

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

Postby tony » Thu Mar 20, 2014 7:46 pm

12EN6 on the right, GE 12W6 in the middle, and left Sylvania !2W6.....

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

Postby tony » Thu Apr 24, 2014 7:10 pm

this is a completed driver board that can be used on power amps...
intended as a replacement for the Dynaco ST70 amps,
but can be used on other amps as well...
the board is an FR4 type and is thru the courtesy of Edrel Sison...
i am making this a test bed for future power amp builds,
12AV7(12at7/6201) input tube and 5418(12au7) long tail pair splitter
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