[Boatanchors] WE 407 and 408 tubes

[K9FFK]

408A is a 20V version of 6AK5 (RCA HB-3)
407A equivalents are 2C51, 396A, 5670.
Dick K9FFK

On 6/11/2016 8:28 PM, Bill Cromwell wrote:
> Hi,
>
> I found a 407A and a 408A vacuum tube (also known as valves) lurking 
> in my stash. These tubes seem to have some special or magical 
> characteristics. Can somebody tell me about their special virtues? 
> They seem to focus on VHF. I get nosebleeds starting at 21 mc so VHF 
> tubes are not so special to me (even though I have others that work at 
> VHF).
>
> If it turns out that I don't need them and no audiophile offers a 
> fortune (WE ye know) Do any of you need them to get your radio back on 
> the air? I have one of each.
>
> 73,
>
> Bill  KU8H
>