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Originally Posted by quicksilver96
After reading everything on the DB page, it seems a little more than I want to undertake for just the pimeta (maybe I'll build a ppa, m^3, or MH after I build the ppas). The monofied has a nice picture already for board etching and a circuit that is a bit less complex than the DB. I don't necessarily need all the features of the DB design. Also, the monofied looks pretty inexpensive and if I don't like it, I'll just toss the buf634s back in it.
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FWIW, after building with BC327/337, I've now built with 2N5087/5088 & 2N3904/3906, and found the BC327/337 sounded better, more dynamic.
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Yeah, I did notice that. Any problems leaving a buf634 on the ground channel and running discretes on the L/R channels? |
No that'll work fine, though you could just use the 10mm caps on those last two cap positions instead of swapping out all 4.
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I might end up building a little daughterboard with all three channels on it anyway, depending if I keep the AD843s on a browndog 2->1 on the L/R opamp socket. Since it is a home unit in an oversized case, I have plenty of room to topple the caps out of the way also. |
I thought about a daughterboard for all 3 buffers and L/R single channel opamps but that didn't take care of the ground channel unless the daughterboard was overtop of the output pins which I wanted to avoid. Plus, I already had it modular to fit in all 3 positions. I think all 3 positions should be filled if possible, including ground.
I have two AD843 on a homemade browndog-like adapter and the buffer board pictured fits next to it on a Pimeta, but barely. The dashed lines around it are cut lines and need to completely disappear for best fit, including against the larger Alps Rk27 pot if you used that instead of RK09 or the Panasonic %.
Shoot me a PM with your address and I'll send you a free set of boards. I hadn't decided if I was going to make another run of these same boards and/or to make a daughterboard then use the remaining single boards for ground channels.
Unfortunately in retrospect it seems I didn't bend the Pimeta's integral CCS JFET leads enough or push them down hard enough before soldering so the Pimeta testbed I was using may need a minor operation to fix that before I can get enough clearance for a daughterboard like that on it, unless it stood farther off the mainboard than I want it to... but then again, it's not like my JFETs are sticking up very high either, probably about the same as most Pimetas.