[Hallicrafters] Old Transformers

[Todd, KA1KAQ]

On Mon, Jun 18, 2012 at 1:03 PM, Carl <km1h at jeremy.mv.com> wrote:

> Up to 100%.
>

If the unit hasn't been taken care of and older components haven't been
replaced, it's indeed just a matter of time. Overall use matters, too. A
set used now and then will probably last beyond us whereas one in daily or
at least regular service is likely to give up the ghost sooner. That's
where the component upgrades and reducing line voltage make a huge
difference.


> Ive lost count to how many Hallis (and some other brands including Collins)
> Ive had in for service that had oddball replacement transformers or shorted
> ones and Id have to find a good original or have it rewound.
>

National seems to be the worst for power transformers. Cannot recall how
many HRO-50/60s, NC-173/183s and others I've come across with bad or
replacement transformers. No doubt a combination of age, use, original
materials, and overall maintenance. Elevated line voltage and old
components being the highest long-term risks.

When it comes to audio output transformer failure, Halli leads the pack
there. Fortunately they made enough models that shared the same parts that
replacements are fairly easy to locate. Even if only to rewind.

~ Todd/KAQ