[NJARC] 7094 Tetrode Tube

[Al Klase]

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/