[NJARC] 7094 Tetrode Tube

John Ruccolo jr6v6gt at yahoo.com
Wed Dec 24 13:36:06 EST 2008 

Hi Joe,

Just don't *break* any of those 866's! Mercury poisoning ain't pretty.

What tube can be used to replace the 866's little brother, the 816?

(Or I'll just go with sillycon diodes)

HAPPY HOLIDAYS TO ALL!

JR


--- On Tue, 12/23/08, JOE CRO <n3ibx at verizon.net> wrote:

> From: JOE CRO <n3ibx at verizon.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, 4:58 PM
> Visit our web site - See http://www.njarc.org
> _______________________________________________
> Scott,Al,Others,
>                         I have a "goodly" supply
> of good 866A's if anyone needs them. Let me know and
> I'll scare some up for you.
> 
> BTW, the 3B28 "Xenon" rectifier makes a superb
> sub, and are more reliable than their mercury vapor
> counterparts.
> 
> Mod-U-Later (with a lovely violet glow then a big FLASH!)
>                                                            
>                                Joe Cro N3IBX
> 
> Mercury Vapor Tubes R Us.
> 
> 
> 
> ----- Original Message ----- From: "Scott
> Roberts" <ng19delta at yahoo.com>
> To: "New Jersey Antique Radio Club"
> <njarc at mailman.qth.net>
> Sent: Tuesday, December 23, 2008 2:16 PM
> Subject: Re: [NJARC] 7094 Tetrode Tube
> 
> 
> > Visit our web site - See http://www.njarc.org
> > _______________________________________________
> > 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
> >> >
> >>
> ------------------------------------------------------------------------
> >> >
> >> >
> >> > No virus found in this incoming message.
> >> > Checked by AVG - http://www.avg.com Version:
> 8.0.176 /
> >> Virus Database: 270.10.0/1861 - Release Date:
> 12/22/2008
> >> 11:23 AM
> >> >
> >> >
> >> 
> >> -- Al Klase - N3FRQ
> >> Jersey City, NJ
> >> http://www.skywaves.ar88.net/
> >> 
> >> _______________________________________________
> >> 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
> > 
> 
> 
> _______________________________________________
> NJARC mailing list
> NJARC at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/njarc

More information about the NJARC mailing list