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Hello,

I've got these two units, they need a good amount of servicing I
think. Since these are the first all-tube sets I own, I wanted to ask
about info that might not be present on the manuals (I have both
manuals too).
What kind of microphone is suitable for the ht-46? I read high
impedance but isn't clear to me where to obtain one.

Thanks in advance

Francesco IZ8DWF

I have an HT-46 / SX-146 line since 1965. It was my very first SSB rig. It still
use it from time to time, just to relive the good old days emotions.

Any piezoelectric microphone would do. Or a dynamic microphone with a
high-impedance output, e.g. the Shure 444.

Most modern microphones (Kenwood, Icom, Yaesu, etc.) instead only have a
low-impedance output and do not then produce enough voltage for the HT-46.
However they may be adapted using a low-to-high impedance audio transformer.

Anther solution would be to use a pre-amplified microphone (Shure, Turner) that
would certainly produce enough voltage for the hungry HT-46 mouth.

73

Tony I0JX