[BC] The last of the tube 1000 watt transmitters

[ron at nottltd.com]

The last Collins 20V3s were manufactured in 1968 + or - 2 at their 
Dallas plant.  They were 100% tubes (including an 807 driver) to the 
very end.  I think they even used mercury vapor rectifiers, 
also.  The replacement was the 820-D which used 5-500 tubes.
ron

----- Original Message ----- From: "Powell Way" <powell at backroads.net>

>I am not sure what Collins then Continental made?  I know there was 
>a 20V3 that wasn't as pretty as the earlier models. I don't know if 
>it had solid state parts or not. That 1 KW Continental had
>5-500 tubes, and you could go to 4-400's with a modification. I 
>heard from those that did the mod that tube life was very short and 
>it didn't sound as good. Someone had one, converted back to 5-500's 
>put in the new tube spares and got a solid state TX and relegated it 
>to standby.