[Boatanchors] Drake 2B and the saga of the 6BF6

[Bob Groh]

Wow, sounds like a most productive trouble shooting session. Amazing how
much had to be done. I do have one recommendation for you - get rid of that
6X4 rectifier!  They are prone to exactly the type of failure you
mentioned. I know you are reluctant to go to solid state rectifier but that
is really the best thing to do. Two silicon diodes (1N4007) and a series
resistor (to more closely approximate the voltage drop in the 6X4 and to
control current surge) of about 330 ohms, 2W wirewound.

73
Bob Groh, WA2CKY

On Sun, Jan 27, 2019 at 11:28 AM <n2lxm at juno.com> wrote:

> Good Afternoon All,
>
>         Yesterday I spent seven hours working with a friend on a basket
> case 2B. He had purchased is a an Antique radio auction some time ago.
> After reworking (well removing) the solid state power supply mods, fixing
> a few, well many wiring errors, finding out tubes were in the wrong
> location, testing the tubes, finding a replacement 6X4 we were able to
> get the Old Girl running. After about a half hour, the radio starting
> pooping fuses. Turns out the 6X4 developed a filament to plate short. So
> put another 6X4 in. Still no signals. tracing lead us to the 6BF6 (dual
> diode, triode). Now not having one of those on hand, and a quick check of
> data sheets, we found that a 6AV6 will work, put has to much gain. So the
> AVC is not working as it should. But the radio now works. Going to order
> a new 6BF6 today. Is this tube only used in Drake tube radio's. Can't
> seem to find any this else that use's it. Also if anyone has a 2B, and
> could take a good photo of the Dial string placement, that they could
> send me it would a great help. I have a manual, but the illustration is
> not the greatest. Thanks.
>
>
>                                                     Jeff N2LXM
>                                           Amateur Radio Operator
>                                                       American
>                                                         Patriot
>                                      Proud Father of Two US Marines
>
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