21 Apr
2005
21 Apr
'05
11:14 p.m.
> Some mil gear (eg PRC-41) has very small ceramic
tubes -not sure if
> they are quite as small as the Nuvistor but they must be close-
> likewise some hearing aid amp tubes were pertty damn small as well.
And don't forget the first generation of R/C receivers intended for use in
model airplanes. They needed something small, lightweight, battery-powered
and inexpensive, so voila - miniaturized valves. I can't claim to have seen
one "in the flesh" yet, but I have a hobbyist book on what they used to call
"micro-electronics" in the mid-50s (ooh, printed circuit boards instead of
solder lug strips!) which shows a device about the size of a packet of
cigarettes with several such valves directly soldered onto a board with the
wires coming out of them.
Anybody here been R/C-ing back then?
cheers
--
Arno Kletzander
Stud. Hilfskraft Informatik Sammlung Erlangen
www.iser.uni-erlangen.de
+++ NEU: GMX DSL_Flatrate! Schon ab 14,99 EUR/Monat! +++
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22 Apr
22 Apr
5:02 a.m.
At 08:14 AM 4/22/05 +0200, you wrote:
I was. I kept one of my tube type RC planes for many years but finally
lost it when my mother moved while I was away in the service. I bought it
second hand in about 1963. It and two other OLD planes disappeared during a
garage sale. She says that she didn't sell them but they disappeared none
the less. One was a hand built contol line model of a P-51 that my father
built dring WW II. I really hated to lose that one. I was lucky in that I'd
taken the engines out of all of them and taken them with me. I still have
them, an O&R .23, a DeLong .30 and a McCoy something. All are original
spark ignition engines. FWIW I do still have the "Little Stik" RC plane
that I built in Thailand in 1974. It's been ALL over the world.
Joe
> Some mil gear (eg PRC-41) has very small
ceramic tubes -not sure if
> they are quite as small as the Nuvistor but they must be close-
> likewise some hearing aid amp tubes were pertty damn small as well.
And don't forget the first generation of R/C receivers intended for use in
model airplanes. They needed something small, lightweight, battery-powered
and inexpensive, so voila - miniaturized valves. I can't claim to have seen
one "in the flesh" yet, but I have a hobbyist book on what they used to call
"micro-electronics" in the mid-50s (ooh, printed circuit boards instead of
solder lug strips!) which shows a device about the size of a packet of
cigarettes with several such valves directly soldered onto a board with the
wires coming out of them.
Anybody here been R/C-ing back then?
cheers
--
Arno Kletzander
Stud. Hilfskraft Informatik Sammlung Erlangen
www.iser.uni-erlangen.de
+++ NEU: GMX DSL_Flatrate! Schon ab 14,99 EUR/Monat! +++
GMX Garantie: Surfen ohne Tempo-Limit! http://www.gmx.net/de/go/dsl
4 p.m.
I've not been into R/C stuff, but I am into 'submini' tubes.
I recently built a 5-tube regenerative receiver for the 49 meter band using
5678's for the 2 stage tuned RF amp, detector, and first audio amp. A 5676
serves as the final audio driver.
Performance is awesome, and it runs on batteries. Warm-up time is at most
3 seconds, nearly instant-on operation.
These tubes are only about 1 cm in diameter, and perhaps 4 cm long, with
wire leads (no pins, no socket needed).
This is my fourth tube based radio. A friend was joking that these
recreations
sould be known as 'bunker buddies' 1 thru 4, as they use no semiconductors
at all.
9:07 p.m.
On Fri, 22 Apr 2005, Bob Shannon wrote:
I recently built a 5-tube regenerative receiver for
the 49 meter band using
5678's for the 2 stage tuned RF amp, detector, and first audio amp. A 5676
serves as the final audio driver.
Cool! I love subminis! I've collected a bunch of tubes and stuff
(sockets and various). Care to post yr schematic and any photos?
10:44 p.m.
I am interested in a schematic, too. I think I have some of those
small wire lead tubes left. They are quite interesting. It would be
fun to do something with them.
I like radios but to keep this a little on topic are there any analog
computer designs that could be built with a small batch of small
tubes?
I recently built a 5-tube regenerative receiver for
the 49 meter band using
5678's for the 2 stage tuned RF amp, detector, and first audio amp. A 5676
serves as the final audio driver.
Performance is awesome, and it runs on batteries. Warm-up time is at most
3 seconds, nearly instant-on operation.
These tubes are only about 1 cm in diameter, and perhaps 4 cm long, with
wire leads (no pins, no socket needed).
--
Paxton Hoag
Astoria, OR
USA
10:48 a.m.
Hi,
Arno Kletzander said:
And don't forget the first generation of R/C
receivers intended for use in
model airplanes. They needed something small, lightweight, battery-powered
and inexpensive, so voila - miniaturized valves. I can't claim to have seen
one "in the flesh" yet, but I have a hobbyist book on what they used to call
"micro-electronics" in the mid-50s (ooh, printed circuit boards instead of
solder lug strips!) which shows a device about the size of a packet of
cigarettes with several such valves directly soldered onto a board with the
wires coming out of them.
Anybody here been R/C-ing back then?
I saw them, but by the time I could afford r/c myself it was solid state.
I remember guys using valves and miniature hi-sensitivity relays to run
things like "Galloping Ghost" - a pwm proportional setup.
There were tuned reeds as well for multi-channel.
--
Arno Kletzander
Stud. Hilfskraft Informatik Sammlung Erlangen
www.iser.uni-erlangen.de
+++ NEU: GMX DSL_Flatrate! Schon ab 14,99 EUR/Monat! +++
GMX Garantie: Surfen ohne Tempo-Limit! http://www.gmx.net/de/go/dsl
--
Cheers,
Stan Barr stanb at dial.pipex.com
The future was never like this!
7135
days inactive
7136
days old
5 comments
6 participants
participants (6)
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Arno_1983＠gmx.de -
bshannon＠tiac.net -
innfoclassics＠gmail.com -
rigdonj＠cfl.rr.com -
stanb＠dial.pipex.com -
tomj＠wps.com