Hints & Kinks (WAS: Ranger Mod. Xfmr.)

[Doug Hall]

>On  8 Jun 97 at 19:00, Doug Hall spoke about WTB: Ranger Mod. Xfmr.
>and said:

>>    I've managed to smoke the modulation transformer in my Johnson
>>    Ranger.
>>

Then AF4K/G3XLQ (bry at mnsinc.com) wrote:

>WOW! Now THERE Is a fair warning to all users of
>older AM rigs, and even tube audio amplifiers in general.
>
>My suggestion is this: put a FUSE in the B+ lines going to the plates
>of the Mod power tube(s) and RF final(s). Say a 500mA
>or a 1A fast-blo cartridge fuse. This way if a tube shorts while
>you are on the air, the FUSE will be taken out before the power
>transformer or mod transformer!!
>
>Is this a great idea or what?

It may be a great idea, but in my case it wouldn't have helped. The
modulator tubes and the final are fine - the transformer just got hot and
developed a primary-to-secondary short. These things happen to 40 year old
radios.
73,
Doug, KF4KL