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Hi to all,I've got an old mid 60s Fender Vibro Champ and I just discovered these tubes in the preamp section with a mysterious, half-erased logo: after a few research I saw that it matches the Hickok logo. 12AX7 is marked on the back side.
Only, online you can find informations on the Hickok tubes testing machines, but absolutely NOTHING on Hickok tubes.
They sound superb in the Blackface though but I wonder if they are old, original, rare, etc...
Any info is welcome, thanks a lot!
"You ain't heard nothing yet".
Edits: 03/17/21Follow Ups:
and other test equipment that used tubes.
that's wise of them, because who would want to open up a costly SOTA tester and see tubes made from Raytheon or someone else. Customers would be on the phone asking why.
Remember buying a Fisher and finding out they were Telefunkens? Used prices jumped a bit after that.
Yes, manufacturers commonly had their names rebranded onto tubes. Eico, Fisher and Dynaco did this regularly. They usually were high quality tubes like Telefunken and Mullard.
.
Have Fun and Enjoy the Music
"Still Working the Problem"
I have a fair number of both HP and Tektronix tubes, HP in small boxes and Tektronix in cardboard tubes. All of my other equipment manufacturer labeled tubes are 'pulls', sadly. That said, the E for M tubes tend to have been treated gently, unlike some test equipment pulls.
Ahoy hoy!
From the glance, it almost looks like a Sylvania. Another angle/shot of the plates would settle it I think.
Funny... Just occurred to me... We've seen a lot of repros on old tooling, but the Sylvania stuff... No... I wonder if the US army has been holding onto the equipment somewhere...
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May your tubes be lively, warm, and long-lasting. Holy be thy heater.
Hey there,
Thank you people for your feedback. TubeAcolyte: Here is another shot/angle of that same tube for you.
Is that ok?
"You ain't heard nothing yet".
Ohhh that's perfect!
Yep, very much a Sylvania. Those are great tubes. Some people knock em for being "standard" but I found them reliable and powerful sounding, but without being harsh. Especially the later runs on this design. This is mostly thanks to a way higher transconductance than what data sheets would have you reasonably expect/assume. The standard value is 1600micromhos, a NOS tube usually reads 1700, and I've seen these read into the 1800-1900 range. And that has a definitive effect on sound.
I found these great for phase inverter duty!
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May your tubes be lively, warm, and long-lasting. Holy be thy heater.
That's very cool, thanks a lot for your time and knowledge!
They sound absolutely phenomenal in the amp (they came with it when I bought it).
Super clear, warm, precise, and with almost no noise at all. I'm no expert yet but the Sylvanias I use in my amps, preamp or power tubes, always sound beautifully.
"You ain't heard nothing yet".
The secret is in their filament. It's not the twisted wound you'd see in a 7025, but helical wound has very good noise properties as well. Enjoy them, and keep your eye out for them. You can snag em pretty cheap sometimes.
Happy playing, and thanks for your kind comments!
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May your tubes be lively, warm, and long-lasting. Holy be thy heater.
Did someone say NOS US made 12ax7s?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Wowo that's like a tube dream box!
That would "feed" my vintage amps for centuries. I have a couple of spare NOS GE and RCAs, and also old Radiotechnique 12AX7s (French made, well appreciated by audiophiles, sounds good on my Fender amp).
Any chance you would sell a bunch of 'em?
"You ain't heard nothing yet".
You must have a bunch of equipment that uses those X7 tubes, as that stash should last multiple lifetimes for those (myself included) who only need a couple for my gear.
They are left overs from the recording studio that I built and used to work at. The owner of the studio was an equipment dealer credited (in an article in The Absolute Sound) with starting the whole "vintage American audio gear sold to the Japanese" thing.When we closed the studio and he sold all the classic tube studio gear he allowed the buyers to pick a set of spare tubes for each piece of gear and the rest he gave to me.
Those are just the US made 12ax7s. There are many others and many other tube types that I got from him.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 03/18/21
Hickok didīnt produce tubes, they rebranded other manufacturers tubes. I canīt make out who made your tube, maybe someone here can.
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