Can ya ID the T-shirt tube?

Ancient - 4 pin. Rectifier is about all ya can do with 2 left after fil. It's before my time, tho I've seen most.. back to the De Forest Audion.

The demise of Heathkit and the other kit suppliers seemed to parallel the rise of dumbth - as well as cheap disposable electronics. Fewer and fewer it seems, are much interested in really understanding how things work. As teaching tools (while scoring a decent stereo in the process) - I think the logic of tubes was much easier to grok than 'holes' and current-controlled devices - as all semis are. Also bulletproof. (If occasionally lethal to the terminally sloppy with sweaty palms).

Anyway.. I think even the music was psych. enhanced in a dim living room - with two pair of KT-88s (and bright rectifier in background) epitomizing POWER you can See! Still have a box of (small signal) new tubes in garage.. Russia seems to be the new tube superpower (!). Early Tek portables had/have some tiny glass HV rectifiers and.. nuvistors! for the pre-FET input amps.. Now Those were cute! itty bitty ceramic tubes the size of a large xsistor - triodes thru pentodes.

{sigh} I resisted picking up a Keithly tube (+chopper) picoammeter on eBay.. You can do femtoamps with a National Semi op-amp now - in fact Bob Pease scratched out a circuit whereby you can notice a change of ~10 more/less electrons! Eerie almost.

Tubes \ufffdber Alles

Post #48,107 by Ashton 8/5/02 7:30:28 AM Reply	Can ya ID the T-shirt tube? Ancient - 4 pin. Rectifier is about all ya can do with 2 left after fil. It's before my time, tho I've seen most.. back to the De Forest Audion. The demise of Heathkit and the other kit suppliers seemed to parallel the rise of dumbth - as well as cheap disposable electronics. Fewer and fewer it seems, are much interested in really understanding how things work. As teaching tools (while scoring a decent stereo in the process) - I think the logic of tubes was much easier to grok than 'holes' and current-controlled devices - as all semis are. Also bulletproof. (If occasionally lethal to the terminally sloppy with sweaty palms). Anyway.. I think even the music was psych. enhanced in a dim living room - with two pair of KT-88s (and bright rectifier in background) epitomizing POWER you can See! Still have a box of (small signal) new tubes in garage.. Russia seems to be the new tube superpower (!). Early Tek portables had/have some tiny glass HV rectifiers and.. nuvistors! for the pre-FET input amps.. Now Those were cute! itty bitty ceramic tubes the size of a large xsistor - triodes thru pentodes. {sigh} I resisted picking up a Keithly tube (+chopper) picoammeter on eBay.. You can do femtoamps with a National Semi op-amp now - in fact Bob Pease scratched out a circuit whereby you can notice a change of ~10 more/less electrons! Eerie almost. Tubes \ufffdber Alles
Post #48,143 by Andrew Grygus 8/5/02 11:26:25 AM Reply	It's an Amperex 211D It turns out I have two of them. It's a a high power transmitting triode. One of the two heater pins is also the cathode pin (heater floats at cathode voltage). That leaves one pin for plate and one pin for control grid. Anode is sintered carbon because metal would buckle at the temperture these things ran at. Hight 7-1/2", dameter 2-1/4" [link\|http://www.aaxnet.com\|AAx]
Post #48,262 by a6l6e6x 8/5/02 8:53:44 PM Reply	The last glowing anode I saw was in the early 1960's,... a ham friend of mine built a transmitter from scratch. In the garage I have a Sylvania 23Z9, (I just checked) so I have a private mini-museum too! It's a Compactron, from the dying days of tubes. Alex "Television: chewing gum for the eyes." -- Frank Lloyd Wright

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