[NJARC] 7094 Tetrode Tube

Tue Dec 23 16:58:00 EST 2008

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
>> >
>> > _______________________________________________
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>> > 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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