under Rupert Neve folder? Is it legal?)gyraf said:Could you re-upload to /technical documents section?
dirty1_1garry said:under Rupert Neve folder? Is it legal?)
Warning: That link is 23 MB.L´Andratté said:The working principle of the preamp is wonderfully explained by P.Baxandall here:
Apparently 2SB797, that is now unobtainium)L´Andratté said:I would be interested in the transistor type
It's a very common architecture, and rather basic. It has been improved in two sequences: first replacing the single transitors with Szlikai pairs (two complementary transistors), and second applying voltage NFB to the transistors (typical Cohen topology). A lot of progress has been made since the 70's.The working principle of the preamp is wonderfully explained by P.Baxandall here:
https://tinyurl.com/yxj4gfvg
Indeed; I routinely used quadfilar xfmr's in this application. Check the Lars Lundahl website (LL5402). Different implementation, though.Since secondaries are connected 2*2 (ser./par.) maybe a similar transformer behaviour can be achieved with a transformer with only three (EA2503) or even two secondary windings?
abbey road d enfer said:Apparently 2SB797, that is now unobtainium)
Indeed, it's a misunderstanding. I shorted two neuronal connections.Winston O'Boogie said:Are you thinking of the 2SB737 maybe? Manufactured by Rohm, TO-92 device having circa 2 ohm Rbb and beta up to about 500?
Doesn't matter much as they're extinct these days too
I don't think the Neve uses them though whichever you meant, I'm sure it's a pair of current production surface mount devices in that device. I'd be surprised if not.
squarewave said:Nice circuit. Basic CFIA with clever gain trim. It would be interesting to see the spectrum of the "silk" control to see precisely what sort of harmonics are generated but at least it's not a silly hack. It looks like a very solid and yet relatively simple circuit. For the price it's a nice preamp.
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