Custom 2A3 Amp by Paul Birkeland

[Hank Murrow]

Front view of the 2A3 amp showing separate enclosures for the left and right signal circuits with separate hybrid shunt-regulated power supplies between them in the center chassis with 6S4A

 

[Hank Murrow]

MQ 15335 input transformer at left, MQ filament choke for the 2A3. 6CK5 driver loaded with current source, MQ BCP-16 Cobalt grid choke for the 2A3, MQ EXO-03 plate choke for the 2A3, and 6 uf parafeed oiler near the output taps.

Completely separate Power Supplies for each channel with BH PT-4 transformers feeding separate hybrid shunt-regulated power supplies with 6S4A

 

[mrarroyo]

I wonder how loud the fan gets? Is that a 3 wpc?

 

[Hank Murrow]

Dear arroyo;

The fan has three adjustment for speed, and with it on the middle speed the fan can be heard @ 3 feet, on the low speed at 1 foot. Even at the lowest speed the fan keeps the Linestage much cooler..... barely warm.

3 watts per channel is how it pencils out...... but I have not measured it yet. It drives my Omega Super5's very well in  medium size LR. Should do even better with my homemade 3 way system when I get that up and running again.

 

[mrarroyo]

Darn, that is nice indeed. Enjoy the fruits of your labor.