Μετα απο επικοινωνια με τον Bud Purvine (budp στο diyaudio) μου εδωσε τις εξης πληροφοριες για ενα καλο project με τις 300b.
[FONT=Arial, Helvetica, sans-serif]1.) A CCS on the input to allow DC offset voltage from a directly connected DAC to be absorbed as extra power for the CCS. Gary Pimm does this very thing in his PP Tabor amplifier, though I am not sure he shows how to actually implement it.
2.) A pair of paralleled frame grid driver tubes, either in cascode or just straight parallel SE, with CCS on their cathodes, all to drop the plate impendence and required primary inductance of a following interstage transformer.
3.) A step down interstage transformer using 48% nickel core and a step down ratio of not more than 1.3 to 1, to reduce the miller capacitance of the following 300 B tubes. This ratio would have to be specified by a very high level design engineer who can actually comprehend all of the detailed nuances involved.
4.) A pair of 300 B tubes in SE parallel. I doubt that mesh grid tubes would be of much benefit at this performance level and would not recommend them un less you have an EnABL'd driver setup and baffle control, John Hassquin or Le Cleach designed horns or a full ribbon system.
5.) A level three SE OPT, built on a couple of core sizes larger than the SE OPT we build for George Wrights Model 7 amplifiers. This done to drop the DC resistance to less than 0.1 ohm in the 4 ohm secondary, 0.2 ohm in the 8 ohm secondary and 0.3 ohm in the 16 ohm secondary connections. Done to provide the least losses possible, as a reflected resistance via the square of the turns ratio, from secondary to primary.[/FONT]
Πως σας φαινονται? Μπορει καποιος να εξηγησει καπως πιο απλα για εναν αδαη?
Σχημα προσεχως..
[FONT=Arial, Helvetica, sans-serif]1.) A CCS on the input to allow DC offset voltage from a directly connected DAC to be absorbed as extra power for the CCS. Gary Pimm does this very thing in his PP Tabor amplifier, though I am not sure he shows how to actually implement it.
2.) A pair of paralleled frame grid driver tubes, either in cascode or just straight parallel SE, with CCS on their cathodes, all to drop the plate impendence and required primary inductance of a following interstage transformer.
3.) A step down interstage transformer using 48% nickel core and a step down ratio of not more than 1.3 to 1, to reduce the miller capacitance of the following 300 B tubes. This ratio would have to be specified by a very high level design engineer who can actually comprehend all of the detailed nuances involved.
4.) A pair of 300 B tubes in SE parallel. I doubt that mesh grid tubes would be of much benefit at this performance level and would not recommend them un less you have an EnABL'd driver setup and baffle control, John Hassquin or Le Cleach designed horns or a full ribbon system.
5.) A level three SE OPT, built on a couple of core sizes larger than the SE OPT we build for George Wrights Model 7 amplifiers. This done to drop the DC resistance to less than 0.1 ohm in the 4 ohm secondary, 0.2 ohm in the 8 ohm secondary and 0.3 ohm in the 16 ohm secondary connections. Done to provide the least losses possible, as a reflected resistance via the square of the turns ratio, from secondary to primary.[/FONT]
Πως σας φαινονται? Μπορει καποιος να εξηγησει καπως πιο απλα για εναν αδαη?
Σχημα προσεχως..
1,56 με 1.3:1), θα προστεθεί όμως αυτή του μετασχηματιστή που είναι μεγαλύτερη από το όφελος.
