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Official M2 schematic
Official M2 schematic
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Old 12th January 2018, 07:27 PM   #2391
marconi118 is offline marconi118  United Kingdom
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Dac is akm4393 direct output.
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Old 12th January 2018, 07:32 PM   #2392
grimberg is offline grimberg  United States
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Quote:
Originally Posted by Zen Mod View Post
JFet , present production
There aren't many good through-hole devices left in production. Are you relying on surface mount devices? Maybe MMBFJ271...
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Old 12th January 2018, 07:36 PM   #2393
Zen Mod is offline Zen Mod  Serbia
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Official M2 schematic
considering that load resistance (given in datasheet) is 600R , we can assume that you can connect follower stage directly

though , my experience is telling me that proper additional buffer will result in better sound

as with many other things , you can be sure only after trying it all

if you are content with simplest solution , goal is fulfilled - just enjoy in music and forget all technicalities
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Old 12th January 2018, 07:39 PM   #2394
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Quote:
Originally Posted by grimberg View Post
There aren't many good through-hole devices left in production. Are you relying on surface mount devices? Maybe MMBFJ271...
2sk2145
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Old 12th January 2018, 07:49 PM   #2395
marconi118 is offline marconi118  United Kingdom
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Bf862 SMD is acceptable if worth the effort in soldering it.
What is the bias of m2? 1A?
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Old 12th January 2018, 08:16 PM   #2396
Zen Mod is offline Zen Mod  Serbia
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Official M2 schematic
plenty of solutions with BF862 around

M2 Iq is automatically set and , say, between 1A2 and 1A5 , depending of parts you actually have
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Old 12th January 2018, 08:36 PM   #2397
marconi118 is offline marconi118  United Kingdom
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Waiting impatient your solution with 2sk2145
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Old 12th January 2018, 09:38 PM   #2398
KevinHeem is offline KevinHeem  United States
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Official M2 schematic
Quote:
Originally Posted by KevinHeem View Post
To me the M2 sounds a little warmer with slightly softer high end. The F4 doesn't really sound like anything, you just hear whatever comes before it.
I think that's exactly what NP said about the M2's sound. Unfortunately I lost my M2 to a friend and I don't think it's coming back (it's ok, he has some stuff I want to trade with him). I'm listening to the F4 for now and It's preferable to me on some recordings.
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Old 12th January 2018, 09:50 PM   #2399
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as said numerous times - F4 and BA3 OS can't be compared with any other Papamp , simply because they are always paired with some additional gain stage ....... embracing fully (well , 98%) imprint of that stage on sound

OK - yes , in rare occasions , where someone really doesn't need any additional gain , driving source followers directly from source , we can take them as amplifier itself

however , those occasions are unfair to regular (gain-having ) amps
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