Post by: mtnbkr on September 15, 2008, 04:21:57 PM
I have two. Dunno if they work. They were part of a "Mystery Box" raffle at my radio club meeting tonight. Also got a bunch of misc components (diodes, resistors, etc).
Film canister for scale.
Chris
Post by: Gewehr98 on September 15, 2008, 04:40:40 PM
Are you going to mod your transmitter to incorporate them?
Although they're designed for something different, I know of a couple tube audio amps that were built using those monstrosities.
Yup, a high-power HF-output tube used in an audio amp. And I thought all my Svetlana 6550s warmed up the living room on cool evenings!
I just sold a new-in-box pair of those Eimacs on eBay a few months ago. Wish I'd known you were in the market for some...
Post by: Perd Hapley on September 15, 2008, 04:59:56 PM
Post by: mtnbkr on September 15, 2008, 05:01:14 PM
One is definitely dead, it has loose filaments floating around. I'll probably put it on a block of wood in my workshop. The other will probably go back into the mystery box for next week...or not.
Chris
Post by: ArfinGreebly on September 15, 2008, 05:04:25 PM
Post by: Gewehr98 on September 15, 2008, 05:52:09 PM
Make a filament power supply for it (think 6-volt wall wart), and turn it into a night light. Use one of those day/night photocell wall outlet switches so it only runs at night. (Been there, done that...)
Post by: S. Williamson on September 15, 2008, 07:11:12 PM
NERRRRRDS!!!
Post by: Gewehr98 on September 15, 2008, 10:09:34 PM
Post by: mtnbkr on September 16, 2008, 02:01:35 AM
Chris
Post by: richyoung on September 16, 2008, 05:01:17 AM
Sweet!
Are you going to mod your transmitter to incorporate them?
Although they're designed for something different, I know of a couple tube audio amps that were built using those monstrosities.
Yup, a high-power HF-output tube used in an audio amp. And I thought all my Svetlana 6550s warmed up the living room on cool evenings!
I just sold a new-in-box pair of those Eimacs on eBay a few months ago. Wish I'd known you were in the market for some...
Are you going to mod your transmitter to incorporate them?
Although they're designed for something different, I know of a couple tube audio amps that were built using those monstrosities.
Yup, a high-power HF-output tube used in an audio amp. And I thought all my Svetlana 6550s warmed up the living room on cool evenings!
I just sold a new-in-box pair of those Eimacs on eBay a few months ago. Wish I'd known you were in the market for some...
6550! Phillisitine! (Unless you just need lots of cleAN headroom...) 6550s, when there are 6l6GCs, EL34s, and KT66s around?
Post by: K Frame on September 16, 2008, 05:11:55 AM
Need to bring in some pretty women to scare all the geeks back into their holes...
Post by: seeker_two on September 16, 2008, 07:15:46 AM
Yeah, but this nerd enjoys the sound of filaments, plates, and grids - in nearly every room of the house, save for the commode. (Thinking about that, too...)
If you need vacuum tubes to operate your commode, you really should give up plumbing.....
Post by: Harold Tuttle on September 16, 2008, 07:24:55 AM
Post by: Gewehr98 on September 16, 2008, 07:25:00 AM
Post by: AJ Dual on September 16, 2008, 08:28:40 AM
Post by: mtnbkr on September 16, 2008, 08:32:43 AM
Chris
Post by: AJ Dual on September 16, 2008, 08:37:59 AM
One of the things I should have grabbed was one of his older osilioscopes. I really had no use for one, but I never imagined someone would make this either:
http://www.youtube.com/watch?v=6wjl1uMBNkc
Post by: mtnbkr on September 16, 2008, 08:39:59 AM
Chris
Post by: AJ Dual on September 16, 2008, 08:55:02 AM
Holy....
http://www.youtube.com/watch?v=s1eNjUgaB-g&feature=related
From the comments, he's just a kid/teen too, which makes me feel stupid. Granted, I've been with women, and had kids...
but still... stupid. 
Post by: Headless Thompson Gunner on September 16, 2008, 09:00:02 AM
Post by: Harold Tuttle on September 16, 2008, 09:41:07 AM
Post by: Gewehr98 on September 16, 2008, 09:51:56 AM
http://www.cathodecorner.com/
I even bought the proper o-scope cathode ray tube.
I just haven't assembled it yet, because I wanted to build it in a clear acrylic case.
Then, of course, the designer came up with this variant:
http://www.cathodecorner.com/scra/index.html
Post by: AJ Dual on September 17, 2008, 06:29:52 AM
30's, 40's, 50's, and even 60's and 70's "Retro-Future" is what does it for me. Taking the old tech and putting it as the "face" or UI for modern guts is cool. At least in the electronic era, many people had visions of what would be possible, and wished their hardware could do it.
Post by: never_retreat on September 17, 2008, 06:53:59 AM
Post by: The Annoyed Man on September 17, 2008, 07:56:10 AM
I don't own any tube stereo equipment... but i own several tube guitar amplifiers.
Including a Carvin V3 with Ruby EL34 BSTRs in it...
AND, a 30 year old RCA 12AX7 driving the gain in the preamp :-)
only bummer is: it's the only one i have.... when it goes out, it's back to new manufactured tubes :-(
/sigh
Nothin like the glow of hot tubes on a stage to get your guitar-muscles pumping.
Post by: 280plus on September 17, 2008, 08:03:56 AM
Post by: Gewehr98 on September 17, 2008, 08:43:23 AM
Quote
AND, a 30 year old RCA 12AX7 driving the gain in the preamp :-)
only bummer is: it's the only one i have.... when it goes out, it's back to new manufactured tubes :-(
only bummer is: it's the only one i have.... when it goes out, it's back to new manufactured tubes :-(
Not so.
There are LOTS of NOS (New Old Stock) tubes out there to be had, in their original boxes, even.
The 12AX7 was/is fairly common. I'll bet I could find a replacement NOS RCA variant that shipped the same year as yours without too much trouble. In fact, I have one sitting in front of me right now, sans box.
Post by: seeker_two on September 18, 2008, 01:22:45 AM
Must be the dual knob model...
Best kind when you're "tuning in Tokyo"....
Post by: Gewehr98 on September 19, 2008, 09:51:40 AM
That Eimac is a serious RF output tube.
The filament runs at all of 7.5 volts, but draws between 20 and 22 AMPS!
That tube's best left for its intended purposes, or kept looking good on a shelf somewhere.
As for NOS RCA 12AX7 preamp tubes, look here:
http://cgi.ebay.com/Pair-of-RCA-Boxed-12AX7-Tubes-Tested-Strong-Matched_W0QQitemZ200255205272QQcmdZViewItem?hash=item200255205272&_trkparms=72%3A1207%7C39%3A1%7C66%3A2%7C65%3A12%7C240%3A1318&_trksid=p3286.c0.m14
Post by: K Frame on September 19, 2008, 09:53:53 AM
Holy CRAP!
Post by: Nick1911 on September 19, 2008, 09:59:19 AM
Scratch that idea.
That Eimac is a serious RF output tube.
The filament runs at all of 7.5 volts, but draws between 20 and 22 AMPS!
That tube's best left for its intended purposes, or kept looking good on a shelf somewhere.
As for NOS RCA 12AX7 preamp tubes, look here:
http://cgi.ebay.com/Pair-of-RCA-Boxed-12AX7-Tubes-Tested-Strong-Matched_W0QQitemZ200255205272QQcmdZViewItem?hash=item200255205272&_trkparms=72%3A1207%7C39%3A1%7C66%3A2%7C65%3A12%7C240%3A1318&_trksid=p3286.c0.m14
That Eimac is a serious RF output tube.
The filament runs at all of 7.5 volts, but draws between 20 and 22 AMPS!
That tube's best left for its intended purposes, or kept looking good on a shelf somewhere.
As for NOS RCA 12AX7 preamp tubes, look here:
http://cgi.ebay.com/Pair-of-RCA-Boxed-12AX7-Tubes-Tested-Strong-Matched_W0QQitemZ200255205272QQcmdZViewItem?hash=item200255205272&_trkparms=72%3A1207%7C39%3A1%7C66%3A2%7C65%3A12%7C240%3A1318&_trksid=p3286.c0.m14
Wow; bet the power output on that sucker would be up there. Hook it up to an oscillator and start jamming certain parts of the radio spectrum for half the US!