[Milsurplus] [ARC5] Ben Hall's Tube Adaptors: Get You Some'o These!

[AKLDGUY .]

The 6BW6 (with 9 pins) seems like a very good candidate too,
and is often seen here in NZ and I think in Aus, perhaps due
to being used in Australian, NZ and perhaps British TV sets.
It either was never used to the same extent in the US or didn't
garner popularity in US ham literature.

73 de Neil ZL1ANM


On Mon, Jan 26, 2015 at 3:58 AM, Ben Hall <kd5byb at gmail.com> wrote:

> Good morning Dave and all,
>
> On 1/24/2015 6:18 PM, David Stinson wrote:
>
>> Folks- I am impressed!  These are very high-quality and
>> obviously a "labor of love."  Outstanding work, Ben.
>> The bases can be assemble for either 7-or-9 pin sockets.
>> Assembled them with no trouble and they work a treat.
>>
>
> Thank you much for a nice review of them, the photos, and your continued
> work on using the 7/9-pin tubes to replace the very expensive VT-25's and
> VT-52's.
>
> For those wishing further information, I put together a little webpage
> summarizing all the details:
>
> <http://www.kd5byb.net/tubeadapt/tubeadapt.html>
>
> There is one change I've not made to the website.  After dropping one of
> the tiny nuts and it rolling off into oblivion...I now include some extra
> hardware.  ;)
>
>  IMPORTANT:  Whatever your application, the Cathode
>> of the miniture tube needs to be connected to the Heater pin
>> on the 4-pin base that is electrically nearest to ground.
>> In the BC-230, connect the MO and PA cathodes to Pin 4.  If you don't,
>> the tube cathodes will be filament voltage above ground and it will
>> mess-up stage bias.
>>
>
> Very interesting!  I had my 6AQ5's wired cathodes to Pin 1.  Everything
> seemed to be okay, but I'll admit, my work on the set got interrupted by a
> couple of repairs on my test equipment (one of my power supplies died) and
> on stuff around the house (broken toys, mostly).  I had not gotten to more
> than a few power ups into my dummy load.  I did get around to wiring an
> un-un for it so I could use standard 50 ohm dummy loads and power measuring
> equipment.  (I can remember if it was 4 to 1, or 9 to 1.  I looked at both.)
>
> I've now got them rewired to pin 4 and will try them today once I get a
> few other things taken care of.
>
>  "normally."  The 5763s don't do so well there for some reason but work
>> fine when doubling in the final. Maybe it's because 5763 was designed as
>> a VHF tube?
>> I'm making contacts on 30 meters using the 5763s.**
>> I think there's a better 9-pinner out there.  Still looking.
>>
>
> I've done a little poking around myself.  I've not found anything that
> seems radically better.  The 6BQ5/EL84 looked interesting, but seemed like
> the specifications were so close to the 6AQ5 that making the change wasn't
> worth it.
>
> The 6CM6 may be worth a look.
>
>  Ben- I think you should offer these to the Audiophiles.
>> I'm betting for say, $60 a set, they'd buy them like hotcakes.
>> Just need to convince one of the Audio "Gurus" to try them.
>>
>
> I'll have to investigate this.  I know the VT-25 and VT-52 tubes are in
> demand in the audio circles, not so sure if the "lesser" tubes like the
> 6AQ5 are as highly regarded.  On the flip side, it does allow
> experimentation in amps originally taking the 4-pin tubes.
>
> Thanks much and 73,
> ben, kd5byb
>
>
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