[R-390] Russian HF Radios

[mikea]

On Sat, Aug 07, 2004 at 10:01:12PM -0400, WF2U wrote about the Soviet R-250 :

[snip description of _really_ interesting receiver]

> I own a pristine R-250M model. Its performance is simply incredible,
> considering an early 50's design with all octal tubes (19 of them). It
> outperforms many receivers 10 years more advanced. The spec on the
> sensitivity is 0.6 uV  for S/N ratio of 10 dB at 3 KHz IF and 2.5 KHz AF
> bandwidth, with a 100 ohm antenna. Audio output is 0.5 W into 600 ohms at 4%
> (AF output tube is a Russian 6P6, which is the exact equivalent of the 6V6).
> Frequency stability is specified as maximum 200 Hz drift after a warm-up of
> 2 hours!

[snip]

> There are photos of the various versions at a Russian web site
> http://www.cqham.ru/trx/r_250.html .
> 
> Well, I hope this wasn't boring, but there is not too much traffic here
> tonight anyway...

Thanks _very_ much; that's a neat RX, and there's a lot more on that  
site that I'd never heard of. If you'd care to put some larger pix of 
your R-250, internal and external, on your website or to mail them to 
me so that I can put them on my website, I'd be very pleased.         

-- 
Mike Andrews
mikea at mikea.ath.cx
Tired old sysadmin