[gary fretz]

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

[Peter Wieck]

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

[Ian Iveson]

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

[Patrick Turner]

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