[NJARC] 7094 Tetrode Tube

Tue Dec 23 16:40:48 EST 2008

Correct Al,  I'm getting old.  I meant to say 3B28.

3B28  Very High Power Rectifier Half wave rectifier tube.  The 3B28 
will make a great sub for the 866 in E.F. Johnson Amateur rigs and 
others.  No warm-up and a lovely bright orange glow.  The 3B28 is 
also used in many older General Electric and Motorola Transceivers.

73, John

At 02:09 PM 12/23/2008, you wrote:
>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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>
>--
>Al Klase - N3FRQ
>Jersey City, NJ
>http://www.skywaves.ar88.net/
>
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