New Tube-buffered LM1875 based on MiniRef

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E

erikovsky

Banned (Sock Puppet)
Joined 2015
elecfimakers.blogspot.com/
Hi all,

I designed a new Tube-buffered LM1875, which is based on MiniRef by linxguru.

Attach schematic and PCB layout.

Any suggestions?
 

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linuxguru

Member
Joined 2007
Cool - I missed this for 3+ years. I'd probably go with 6688/E180F at low rails (say +/- 12V) for the input cathode follower, but YMMV.

I'm a little confused by the 47 uF bipolar cap in the inverting (feedback) network of the Howland - it would effectively block DC and low frequencies during the operation of the current pump, and change the AC response character.

What is its purpose, and how does it sound?
 
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