[GreenKeys] W9DDD

[Harold Hallikainen]

On Thu, February 20, 2025 5:07 pm, Tom Hunter wrote:
> John,
>
> I don"t know which came first - the Heathkit HD 3030 or thr Flesher
> TU-470.
>
> But they are absolutely identical to the extent that I took the power
> transformer out of a dead TU-470 and put it in an otherwise good Heathkit.
> It worked perfectly.  Both have internal loop supplies.
>
> Note: these old TU's don't like today's line voltages. That is how
> the transformers burn out. I have to run them on an eBay bucking
> transformer. They are very happy that way.  My  FlesherTU-170
> runs noticeably cooler too. The bucking transformer was well
> worth the 90-some dollars.
>
>
> Tom   N3CRK

I thought the Heathkit looked a lot like a Flesher TU-300, but the
Heathkit does CW. I did not see a schematic on the heathkit. Does it
decode CW, or just give you a mark/space output based on the
presence/absence of the CW tone?

I have not noticed a line voltage issue with my TU-170, though it does run
warm.

How much line voltage are you bucking? A small filament transformer can
act as a bucking transformer, and they are cheap!

Harold
https://w6iwi.org




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