[Milsurplus] BC-652 Video

[Ken Gordon]

I have always loved dynamotors. I never considered their vibration to be of any concern. 
There are several things about them that I like, not the least of which is their sounding 
somehat like a jet engine spooling up when starting. IMHO, they are LESS likely to output 
"un-handleable" noise than many solid-state equivalients. I was never particularly concerned 
about their efficiency. IMHO, anything battery-powered has low efficiency.

Ken W7EKB


On 3 Jul 2024 at 13:47, Ray Fantini via Milsurplus wrote:

> 
>     Some of you may be aware, or maybe tired of hearing about the 1941
>     BC-652 receiver that I have been playing around with. This radio
>     was part of the Joe Munson estate and although he had it in his
>     collection have no reason to believe that he had anything to do
>     with the extensive hacking that had taken place prior to me
>     picking it up. Think it was something he picked up at some point
>     and just threw into the pile. The receiver was missing everything
>     on the top deck and had one of the worst AC power supplies
>     installed that I have seen. It also had several shorted or
>     extremely leaky capacitors in the screen and plate bypass sections
>     that had to be changed and thanks to John K4OZY I was able to get
>     a NOS dynamotor so I was able to install that and now the radio is
>     set up for field operation from twelve volts DC I had played
>     around with a lot of solid state inverters but when the
>     opportunity turned up to install a dynamotor and being that I have
>     never used one before on one of my projects decided to go ahead
>     and deal with the high current demands, vibration issues and all
>     the other stuff that comes along with that technology. This
>     receiver sucks down almost six amps with three just for filaments
>     and another two or three for spinning the dynamotor. But you have
>     to admit that just seeing it up on top spinning is sexy. You can
>     see the video and judge for yourself at:  
>     https://www.youtube.com/watch?v=nLIwxZaF61k   Ray F/KA3EKH