[NJARC] 7094 Tetrode Tube

Tue Dec 23 14:16:31 EST 2008

I'll pull the top off the HT-41 after I get back from work tonight, and measure the space available. Just have to move it to get to the screws for the lid- and it is HEAVY! Makes all my other boat anchors seem light indeed...

Scott

--- On Tue, 12/23/08, Al Klase <al at ar88.net> wrote:

> From: Al Klase <al at ar88.net>
> Subject: Re: [NJARC] 7094 Tetrode Tube
> To: "New Jersey Antique Radio Club" <njarc at mailman.qth.net>
> Date: Tuesday, December 23, 2008, 2:09 PM
> Visit our web site - See http://www.njarc.org
> _______________________________________________
> John and Scott,
> 
> Let's be careful with the 866AX substitutions.  I'm
> concerned that the AX's are somehow different from the
> common 866A's.  The tubes in the amp shown in the BAMA
> HT-41 manual have four pin bases, that rules out 3B21's
> unless you change sockets.  (If they really are octals. 
> There is a non-mercury equivalent, but I can't remember
> the number.)
> 
> I can't find an 866AX data sheet.  My concern is that
> they might be some sawed-off version that stand less than 5
> 3/4" above the sockets like 866A's.  Are the
> sockets recessed below the chassis?
> 
> 866A's are real common.  We should be able to dig some
> up for a couple of bucks.
> 
> Al
> 
> John Dilks K2TQN wrote:
> > Visit our web site - See http://www.njarc.org
> > _______________________________________________
> > 
> > Scott,
> > 
> > Use 3B21 instead.
> > 
> > http://www.oldradioparts.com/pg1fld.txt
> > 
> > 1456  3B21, HYTRON, OCTAL W/CAP,
> USED.................Q2   5.00
> > 
> > 
> > 73, John
> > 
> > At 12:17 PM 12/23/2008, you wrote:
> >> The seller's e-bay ID is "hugotv",
> and his rating is pretty good (99.1%)
> >> 
> >> I have been in contact with him since it arrived,
> but nothing has been completely resolved as yet. The
> purchase was a "Buy It Now" for a reasonable
> price, with no mention tubes were not included. We did
> discuss the best way to ship them- I had recommended my
> favorite of packing bags of packing peanuts around them in
> situ- it keeps them from moving, and/or being hit by
> anything, and is a pretty sturdy method. He said he was
> going to pack them inside, but removed. Apparently they were
> taken out & shipped separately, via Parcel Post. I have
> had problems with PP in thepast, taking too long to
> arrive(which is why I tell people NEVER use it! Always use
> Priority Mail)
> >> 
> >> He has offered to buy back the unit, but I figured
> a bird in the hand was better than none- I am at least ahead
> by having the machine... So I told him we'd keep looking
> for the tubes, and he told me he'd check with the Post
> Office.
> >> 
> >> I'm hoping to find something I can adapt in,
> if the 7094s fail to appear. I am looking over the
> schematics & cogitating. I also need the 866AX's,
> but found a place with NOS ones in very nice shape around
> $30 a piece. (Does the club or anybody have them cheaper in
> NOS or good used condition?)
> >> 
> >> Thanks!
> >> Scott
> >> 
> >> 
> >> 
> >> 
> >> 
> >> --- On Tue, 12/23/08, John Dilks K2TQN
> <oldradio at worldnet.att.net> wrote:
> >> 
> >> > From: John Dilks K2TQN
> <oldradio at worldnet.att.net>
> >> > Subject: Re: [NJARC] 7094 Tetrode Tube
> >> > To: ng19delta at yahoo.com, "New Jersey
> Antique Radio Club" <njarc at mailman.qth.net>
> >> > Date: Tuesday, December 23, 2008, 4:37 AM
> >> > Hi Scott,
> >> >
> >> > If this dealer is on Ebay, what is his seller
> name?  There
> >> > is one on there who is notorious named
> radio-mart, or
> >> > similar.  The guys have had many - many
> problems with him.
> >> > (I hope it isn't him for your sake.) 
> Ebay seems to do
> >> > nothing about him?
> >> >
> >> > Either way, please warn us with his name. 
> They are pricey,
> >> > he probably sold them seperately.
> >> >
> >> > One on ebay now $114.
> >> > Item number: 360062939302
> >> >
> >> > 73, John
> >> >
> >> > At 04:11 AM 12/23/2008, you wrote:
> >> > > Visit our web site - See
> http://www.njarc.org
> >> > >
> _______________________________________________
> >> > > Anybody have any good suggestions for
> what to
> >> > substitute for a pair of 7094 beam tetrodes?
> I have a
> >> > Hallicrafters HT-41, and the tubes never
> arrived with it...
> >> > I am still bugging the dealer, but have
> little faith
> >> > anything will come of it- he claims they were
> shipped Parcel
> >> > Post... I don't know if he even had them
> at all when he
> >> > had the radio!
> >> > >
> >> > > Thanks
> >> > > Scott
> >> > >
> _______________________________________________
> >> > > NJARC mailing list
> >> > > NJARC at mailman.qth.net
> >> > >
> http://mailman.qth.net/mailman/listinfo/njarc
> > 
> > _______________________________________________
> > NJARC mailing list
> > NJARC at mailman.qth.net
> > http://mailman.qth.net/mailman/listinfo/njarc
> >
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> >   
> 
> -- Al Klase - N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
> 
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