6AH6 vs 6AU6

[EP Swynar]

As you all may well know by now, the 6AH6 is a much more "hotter" tube
(figuratively, NOT literally, in light of the discussion here about filament
currents! Hi) than the 6AU6...

Indeed, "...way-back-when," the technical department at ARRL advised me to
put a 6AH6 in the VFO of my Ranger-1 transmitter, in place of the stock
6AU6, for "better performance."

Around that same time I had built a HB receiving down-converter that used a
6AU6 RF amplifier --- it was replaced with a 6AH6 in short order after I
heard from the ARRL.

In to-day's world, I've dropped 6AH6's in place of 6HS6's in my Drake Twins
in a snap --- the transconductance is the same, I believe, & the base
diagrams are similar...but the similarities between the two sure do diverge
when looking at their respective PRICES...!

~73~ Eddy VE3CUI - VE3XZ

*************************************


----- Original Message ----- 
From: "L.G. Robertson" <digital-conjurers at ROADRUNNER.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Wednesday, February 20, 2008 4:53 PM
Subject: Re: 6AH6 vs 6AU6


> Sorry this was delayed, Carlos, but the ListServ started enforcing an
email
> rule it hadn't enforced before, and it's caused a lot of delay.
>
> Umm...the filament current IS different, according to RCA Tube Manual
> RC-20; ...the 6AU6 is 300 ma, the 6AH6 is 450 ma.  Having said this, most
> filament transformers/windings can handle the extra 150 mils, but you
might
> want to check the schematic to make sure.
>
> Replaced the 6AU6 with a 6AH6 in my TX-1 for some more VFO stability, and
> the filament transformer's been fine for two years now.
>
> -Lin/KJ6EF
>
> =========================================================
>
>
> At 09:29 AM 02/13/2008, you wrote:
> >On 13 Feb 2008 at 3:30, carlos popelier wrote:
> >
> > >
> > > hi,
> > > can you simply plugin the 6ah6 instead of 6au6 without trouble ,
> > > thanks carlos on6cn
> >
> >Yes. They have identical filament characteristics and exactly
> >the same base connections.
> >
> >If you go to NJ7P's tube database on the web, and plug in
> >the two tubes, you will find that one is a direct replacement
> >for the other.
> >
> >Ken Gordon W7EKB
> >
> >-----------------------------------------------------------
> >Products bought, sold or traded here is the responsibility of the
> >parties involved.  This list and the City of Tempe are not responsible
> >for losses or misrepresentations of any kind.  Buyer beware!
> >
> >-----------------------------------------------------------
> >This list is a public service of the City of Tempe, Arizona
> >-----------------------------------------------------------
> >
> >Subscription control - http://www.tempe.gov/lists/control.aspx?list=HEATH
> >To post - HEATH at LISTSERV.TEMPE.GOV
> >Archives - http://listserv.tempe.gov/archives/HEATH.html
>
> -----------------------------------------------------------
> Products bought, sold or traded here is the responsibility of the
> parties involved.  This list and the City of Tempe are not responsible
> for losses or misrepresentations of any kind.  Buyer beware!
>
> -----------------------------------------------------------
> This list is a public service of the City of Tempe, Arizona
> -----------------------------------------------------------
>
> Subscription control - http://www.tempe.gov/lists/control.aspx?list=HEATH
> To post - HEATH at LISTSERV.TEMPE.GOV
> Archives - http://listserv.tempe.gov/archives/HEATH.html

-----------------------------------------------------------
Products bought, sold or traded here is the responsibility of the
parties involved.  This list and the City of Tempe are not responsible
for losses or misrepresentations of any kind.  Buyer beware!

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.aspx?list=HEATH
To post - HEATH at LISTSERV.TEMPE.GOV
Archives - http://listserv.tempe.gov/archives/HEATH.html