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#1
Posted to rec.audio.tubes
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6528 dual triode bias curve
Hi All,
Just wanted to know if anyone knew where to get a bias curve graph for the 6528 for SET and PP. Thanks ahead of time for any help. sincerely, gary |
#2
Posted to rec.audio.tubes
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6528 dual triode bias curve
On Apr 5, 7:26 am, "gary fretz" wrote:
Hi All, Just wanted to know if anyone knew where to get a bias curve graph for the 6528 for SET and PP. Thanks ahead of time for any help. sincerely, gary http://datasheets.electron-tube.net/...115/6/6528.pdf Does this help? It may not be all you need, but it is a start. Peter Wieck Wyncote, PA |
#3
Posted to rec.audio.tubes
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6528 dual triode bias curve
gary fretz wrote
Hi All, Just wanted to know if anyone knew where to get a bias curve graph for the 6528 for SET and PP. Thanks ahead of time for any help. http://frank.pocnet.net/sheets/115/6/6528.pdf PP curves are hard to find for most valves. Not difficult to construct yourself from the given curves; just tedious. Ian |
#4
Posted to rec.audio.tubes
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6528 dual triode bias curve
gary fretz wrote: Hi All, Just wanted to know if anyone knew where to get a bias curve graph for the 6528 for SET and PP. Thanks ahead of time for any help. sincerely, gary For a transformer coupled class A condition, for each triode use Ia = 100mA, B+ supply = Ea = 200V, Pda = 20watts. fixed grid bias = -22V approx. With cathode bias, B+ supply = +222V, Rk = 220ohms, 10W, Ck = 1,000 uF RL centre value should be about 2k. You get a 150pk V anode swing, or 106Vrms, which is 5.6 watts into 2k. Gain will be 6.5, so used as am amp its a very easy triode to drive. Ra = approx 250 ohms, so the tube with RL = 2k gives a damping factor = 2,000 / 250 = 8 which is very good without any loop NFB. PP class AB2 operation should easily give 20 watts, or 15 watts class AB1 into 4ka-a, with Ea = 250V, Ia = 50mA, Eg = -33V. It would appear this single tube can do slightly more than a pair of 2A3, with lower Ra, and higher gain. See the data at http://www.mif.pg.gda.pl/homepages/f...138/6/6528.pdf |
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