On Thursday 20 April 2017 11:14:22 you wrote:

> Thanks for all the interesting contributions. The old book is a very

> nice one :-)

>

> I expect using saturated coils rather than a saturated transformer can

> give better results when it is used for keying a carrier (CW, DFCW,

> QRSS, OPERA...). But that will be rather a narrow band solution. The

> transformer has its advantages too. I will continue to improve the ratio

> between keyed and unkeyed power later...

>

> 73, Stefan

>

Some idea for the transformer...

May be that a small toroidal transformer core for mainline power supply can be useful for 2 and 6 kHz bands. But toroid are without transformer air gap.

A core from an old output transformer vacuum tube amplifier can surely be used from few hundreds Hz to 10 kHz, may be up to 20 kHz if salvaged from an Hi-Fi push-pull amplifier. Audio transformer are with air gap.

73 de Claudio ik2pii

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