[Boatanchors] Diode replacements for 866 tubes, ratings needed?

[WA5CAB--- via Boatanchors]

Rick,

As Rob wrote, the 3B28 is a plug-n-play replacement for the 866 and 866A.  
Most if not all military rigs using the older tubes had that change made at 
least by 1950.  The only valid reason for using silicon instead of 3B28's 
would be that the HV rectifier filament transformer is bad or missing and no 
replacement is reasonably available.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 11/11/2014 09:00:04 AM Central Standard Time, 
ka4inm at gmail.com writes: 
> From: Rick Poole WA1RKT <wa1rkt at comcast.net>
> 
> /*snip*/
> That is my big concern.  This amp will be used with CW and SSB, mostly 
> SSB, and I remain concerned about that choke-input back-EMF issue; 
> reports are that this is most prominent with CW and its full-on, 
> full-off mode of operation.  That's why I need to get a handle on how 
> many 1KV PIV diodes I need to use in each leg of a full-wave rectifier. 
>   The RF Parts 866 solid state replacements are rated at 10 KV PIV (and 
> if I recall correctly, isn't the 866 also rated at 10 KV?)
> /*snip*/
> 
>     866  (RCA)
>    PIV = 7,500 Volts
>    Peak current = 1.0 Amperes
>    Average current = 0.25 Ampere
> 
>     866A  (RCA)
>    PIV = 10,000 Volts
>    Peak current = 1.0 Amperes
>    Average current = 0.25 Ampere
> 
> -- 
>    Ron  KA4INM - Youvan's corollary:
>                  Every action results in unwanted side effects.
>