SET amp owners thread

[DasguteOhr]

Nice clean wiring. Did you do this?

How do you clean inside pin sockets. I can get in a KT pin socket. Its the small driver and signal tubes that are the issue. I have a thin cotton pipe cleaner for the larger holes.

I replaced a few components that were no longer working properly, and a few cables because they were humming a bit. You can clean the sockets with interdental brushes and isopranol alcohol.

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Remove stubborn dirt from the tube pins with a fiberglass pin.

Fiberglass Scratch Brush Pen - 3 Pack - Jewelry, Watch, Coin Cleaning, Electronic applications, Removing rust and corrosion : Amazon.de: Gewerbe, Industrie & Wissenschaft

Fiberglass Scratch Brush Pen - 3 Pack - Jewelry, Watch, Coin Cleaning, Electronic applications, Removing rust and corrosion : Amazon.de: Gewerbe, Industrie & Wissenschaft

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[DasguteOhr]

I believe the Lamm ML2 is one of the best sounding SET amps ever made. I chose not to get a pair after struggling with the 63CC in my Lamm ML1.1 push pull. Lamm said that he’d have to throw away 75% of them to get tubes to his SPEC.

I never doubted that it would sound good, but it does so even if you don't push the tubes to their limits.
Just try it out, take a screwdriver and a multimeter and set it to 260mA (0.26 volts). If you don't like it, you can change it at any time.
I consider the value for a 6c33 tube to be optimal (45 watts at the anode)not at the limit
P.S
If you put the tubes in the oven for 5 hours at 120 degrees (no fan-assisted heating) and then let them cool down in the oven overnight, you'll only throw away 40% at most.

 

[morricab]

I have tried dozens of amplifiers, solid state and tube, with my Quad 2905’s. Nothing is as sublime sounding as my JJ 322 parallel SET. It uses two pairs of 300B’s per channel to produce about 20 watts, which feels ample for my listening tastes. It’s a behemoth weighing almost 100 pounds. The literature on it describes the output transformers as “C-cores”.

JJ Electronic - JJ322

JJ Electronic - Vacuum tubes, Capacitors, Amplifiers

www.jj-electronic.com

View attachment 154952

I had this amp for years and it is quite good except for the highs being too “soft “ for lack of a better word. It would not drive well “normal” speakers but on my horns it was quite nice.

 

[morricab]

As I understand it, the ML2 transformer is the same size and specification, just a different manufacturer.

I thought one review said later versions were heavier?

 

[Kingrex]

I replaced a few components that were no longer working properly, and a few cables because they were humming a bit. You can clean the sockets with interdental brushes and isopranol alcohol.

What size interdental brushes for driver type tubes?

Any way to remove the residue. I find when I clean, solvents lift contaminants, but you need something like cotton to wipe off the mess and remove it. If you don't remove it, it will settle back to where it was. On you metal.

 

[DasguteOhr]

What size interdental brushes for driver type tubes?

Any way to remove the residue. I find when I clean, solvents lift contaminants, but you need something like cotton to wipe off the mess and remove it. If you don't remove it, it will settle back to where it was. On you metal.

Buy a set of different sizes so you'll always have the right size. Alcohol cleans well if any dirt remains, and Q-tips for your ears help wipe it away. Never seal tube contacts with anything; it will attract more dust and dirt.