Custom wound high voltage high current OPTs, PTs and chokes needed

[Ketje]

Are you shure about this ?

2.5k primary, 4 + 8R secondary, 1200V+ at 0.7A, 20Hz-25kHz frequency range, 170-180W

5k primary, 2 + 4R secondary, 1200V+ at 0.35A, 20Hz-25kHz frequency range, 85W (2 OPTs primary used in parallel, secondary series)

7.5k primary, 1.3 + 2.6R secondary, 1200V+ at 0.24A, 20Hz-25kHz frequency range, 60W (3 OPTs primary used in parallel, secondary series)

Low output impedance gives poor coupling.I would suggest two times 5k to 8R+16R and 7.5k to 12R+24R and paralleling the secondary.
Mona

 

[TonyTecson]

Additionally I need Power Transformers covering the following requirements
- primary 240V (!)
the following secondary voltages are required
- 2X 470-0-470V at 0.8A (approx voltage)
- 2x 170-0-170V at 0.3A
- 2x 3.15-0-3.15V at 3A
- 2x 5.1-0-5.1V at 20A (!)

The Power Transformer does not need to be in one core.

if i were to build this, i will separate the high voltages from the filaments supplies,
so: - 2X 470-0-470V at 0.8A (approx voltage) = 1504 va; and
- 2x 170-0-170V at 0.3A = 204 va for a total of 1708 va secondary,
primary volt amperes = 1708/0.6 = 2846 va total
now using an EI M6 cores with 2 inch center leg cores, total stack will be ~ 5 inches and core weight will be around 18kgs...

now for the filaments, 2x 3.15-0-3.15V at 3A
- 2x 5.1-0-5.1V at 20A (!)

total secondary va = 436 va, using a 1 3/4 inch center leg core, stack will be ~ 3 inches and core weight at around 8 kgs...

this is going to be one monstrous amp...