[NJARC] 7094 Tetrode Tube

[John Ruccolo]

Hi Scott,

Somewhere, I have an article on converting the HT-41 to 811A's or 572B's or some other power triode. The 7094's had a reputation for not being very rugged. I have no first-hand experience with them, but that's what I've read. They may resemble the 813 electrically, but they're not nearly as rugged. It's always been the "rap" on that tube.

I'll see if I can find the article for you. I'm certainly *not* recommending conversion, but it's a good thing to keep in your hip pocket as a last resort.

Also, I would recommend Solid-State replacements for the 866's. I'm curious how others feel about that. Frankly, mercury-vapor tubes make me nervous....


Regards,

John


--- On Tue, 12/23/08, Scott Roberts <ng19delta at yahoo.com> wrote:

> From: Scott Roberts <ng19delta at yahoo.com>
> Subject: Re: [NJARC] 7094 Tetrode Tube
> To: "John Dilks K2TQN" <oldradio at worldnet.att.net>, "NJARC Radio Club" <njarc at mailman.qth.net>, "JOE CRO" <n3ibx at verizon.net>
> Date: Tuesday, December 23, 2008, 12:17 PM
> Visit our web site - See http://www.njarc.org
> _______________________________________________
> 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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