6LU8 P-P Project

[sled108]

So, it's been Years since I've built the 6LU8 SEUL Amp...And, it Sounds Great!...But, now I want a bit more Grunt out of it...So, do any of You want to go for another 6LU8 Challenge? How about a Push-Pull Amp?...This is the only Schematic that I could find, and Lay Out...Any Thoughts?

And, then you get into the Real World of Wiring things..Which doesn't show the Size of the Caps...

 

[RogerA]

Wow, you got nothing? I was just enjoying my 6LU8 and thought, I wonder if anyone ever built one PP?

R

 

[Lavane]

I built a sweep tube 6LR8 SEUL amp and thought about a PP amp just using the pentode section for the second output tube. The amp does sound nice, but more than 5.5wpc would be nice. Plus the tubes are dirt cheap. I bought extras at the time they were so cheap. A quad cost me less than $20.

 

[RogerA]

I am amazed at how much sound can be produced by these as SEUL. My 6LU8 can drive my Polk Monitor 50s to good volume, loud volume actually, and they are 89dB @ 1m, 1W.

Though I dream about more powerful amp, this one fits nicely into my 16x19 listening space and fills it with music.
R

 

[Lavane]

There are some really nice PP amp kits. I've built a few from 17wpc to 125 watt mono blocks. Keep your eye out for old tube consoles being sold in your area. I've modified a few to run stand alone. I still have a EL-84 Magnavox push pull amp I modified that sounds nice. I left the stock output transformers on it since they sound pretty good. They used 4 ohm transformers on all of the 6V6 and EL-84 amps though. You can use 8 ohk speakers, but it will cut the output in half. I use a pair of 4 ohm ADS L570/2's with mine. Here is a picture of the Magnavox and 6LR8 amp.

 

[RogerA]

There are some really nice PP amp kits. I've built a few from 17wpc to 125 watt mono blocks. Keep your eye out for old tube consoles being sold in your area. I've modified a few to run stand alone. I still have a EL-84 Magnavox push pull amp I modified that sounds nice. I left the stock output transformers on it since they sound pretty good. They used 4 ohm transformers on all of the 6V6 and EL-84 amps though. You can use 8 ohk speakers, but it will cut the output in half. I use a pair of 4 ohm ADS L570/2's with mine. Here is a picture of the Magnavox and 6LR8 amp.

I found a console many years ago, and fiddled with it, actually sounded pretty good. Eventually went to the landfill, sigh.

Roger

 

[Lavane]

I found a console many years ago, and fiddled with it, actually sounded pretty good. Eventually went to the landfill, sigh.

Roger

The Magnavox PP console amps are probably the most popular.
With just a few easy cheap mods needed to make them sound good. And with a mounting flanges on each side, it makes it easy to wrap some wood around them to make them look good. There are a cpuole of the SE amps that can be made to sound good also. One in particular has a long thread about them. Some like myself have just built them from scratch using various output transformers, etc. I used a pair of cheap $17 Chinese output transformers in my build and it sounds pretty good.