Always unexpected new projects

[w5hro]

Here's my new unexpected new project

http://www.youtube.com/watch?v=Q-xbqlqgWqY

[N3DRB The Derb]

dood! dont be walkin away from 50 yer old radios, you'll burn yer house down. 

[N0WEK]

Nice video!

Those transformers are 70 volt line transformers used in speaker distribution systems (sort of like the pole pigs on your power pole), about 500 ohm on the 10 watt tap and about 2,000 ohm on the 2.5 watt tap.

They work real well to match speakers to 600 ohm outputs and vice/versa too.

[N3DRB The Derb]

I met teh Slab Bacon because my DX-100 ( called the Derb-100) which had been mega mortified caught fire and burned in the basement. I was gonna throw it out  but he fixed the damned thing.  The speech amp got a sub or ultra sonic feedback loop an melted down the whole LV part of the transmitter. 

[N0WEK]

Good to know that those transformers are so versatile; they're cheap and available. Sounds like it'll do a great job on the audio.

[N3DRB The Derb]

that’s probably why it burned up after I left that night

yeh man, I'm hip.    They didnt use the best quality xfmrs in them linyars. Of course driving sweep tubes with 4X the needed power also has an effect.         

[N3DRB The Derb]

yep. radios like fresh new filter caps. 

dont ever fall for the "reforming" bit. Always install new filters.

[w3jn]

A li'l old Radio Shack 6.3V fil xformer works FB as a replacement audio output transformer in a NC-303. 

[w3jn]

Amazingly, that fil xformer sounded better than the stock xformer before it fried.