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작성자 DHTsound
첨부#1 32B_monoblock_PP_amplifier.pdf (26KB) (Down:7)
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  룬달 트랜스를 이용한 32B PP 모노모노 앰프

Here's a picture, and a link to more pics, of the pair of 32b P-P amps I've completed. I used Kevin's schematic and a total of 7 Lundahl transformers in each! The tube compliment is 2 ea 6CJ3 rectifiers, 1 ea 6SN7 input (currently Ken-Rad), 2 ea 2A3 drivers (Sovtek work very well), and 2 ea 32b outputs (EAT). Amorphous core Lundahl trannies are used for the input, the input tube choke, the interstage, and the output. The power supply uses two transformers to get the required plate voltage.

It took about three months to build them, then about three more to finish the covers for the power transformers (at some risk to my wife and the dog during that interval). The mounting plates are 5/16" aluminum plate; doing them was the hardest part. The wood bases are painted aspen. Large heat sinks are required to dump excess heat from the various power supply components -- the heat sinks and plates run warm at about 50캜.

I extremely happy with the results sonically. My goal was to capture the midrange qualities and detail I've always liked about 300b amps, but I wanted amps with more bass, impact, and dynamics. The 32b's provide all of that. The amps should produce about 55 watts as driven, although I haven't gotten around to measuring the output yet. I drive JMLab Mezzo Utopia speakers at 4 ohm impedence. They rock with excellent bass, but also have the midrange and detail I wanted.

I really thank Kevin Carter and give him credit for this excellent amplifier design. Kevin went the extra mile to provide frequent support and guidance from the beginning design definition through the typical start-up teething pains. He's first class.

I'd be happy to answer questions and share details of this build.

Jim



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