Anyone really, really old dudes on hear who can advise
on how much RF power an 01 can handle? Can it drive
a 45 power stage?

Pete

Tio Pedro wrote:
Anyone really, really old dudes on hear who can advise
on how much RF power an 01 can handle? Can it drive
a 45 power stage?

Pete


I have various old tube manuals in print and on disk.
None of them seem to list the maximum ratings for the 01A.
Maximum plate voltage seems to be 135 volts and max plate current
seems to be 3-5 ma. No mention of plate dissipation, but I think
that the plate voltage/current limitations will be the factor
here. I think the type '171 ('71A) which was used as an output stage in
old radios would make a better tube for this purpose. It can handle
up to 180 volts and at least 20ma of plate current. Again no plate
dissipation rating given. Also consider the type 12A, which is
a 'heavier' 01A rated to 180 volts and maybe 10ma of plate current.

"Tio Pedro" wrote in message
...
Anyone really, really old dudes on hear who can advise
on how much RF power an 01 can handle? Can it drive
a 45 power stage?

Pete

No. I don't have technical references as Ken does, but from
practical experience (hope I'm not disclosing my age here),
but the 01A is much better suited as a receiver RF stage, or
a one tube "regenerative" set.......... or maybe an audio amp
driving headphones.

If you're bound and determined to use these old bottles, a
better choice (I think) would be a 45 oscillator driving another
45 amplifier stage.

I've tried using 01A's in transmitter duty, but usually ended up
noticing a bright flash and then no more glow at all!....SOB

A 45 by itself as a one tube, crystal controlled transmitter isn't
too bad either. An FCC monitoring station somewhere in
Nebraska (If I recall correctly) objected to my 45's key clicks,
however. (And I was running an honest 3 watts on 40 in
Washington State.

Old Chief Lynn

"Lynn" wrote in message
...

If you're bound and determined to use these old bottles, a
better choice (I think) would be a 45 oscillator driving another
45 amplifier stage.

I've tried using 01A's in transmitter duty, but usually ended up
noticing a bright flash and then no more glow at all!....SOB

A 45 by itself as a one tube, crystal controlled transmitter isn't
too bad either. An FCC monitoring station somewhere in
Nebraska (If I recall correctly) objected to my 45's key clicks,
however. (And I was running an honest 3 watts on 40 in
Washington State.

Old Chief Lynn

If I had the money, I'd be using 10s, 801s or one of the
bottles that are so coveted by the audio guys these days..
I saw a few 01 xtal oscillators in early QSTs, but very
little information was given about them. Globe 45 tube
are extremely pricey too, unfortunately. I have a few
45 globes in the stash..

Pete

On Dec 29, 1:21 pm, "Tio Pedro" wrote:
Anyone really, really old dudes on hear who can advise
on how much RF power an 01 can handle? Can it drive
a 45 power stage?

Pete

Hey OM
How old is a really really old dude? Is that like Methuselah?
Although Ima really old fart. I think there would be to much gas in
that tube for you to use it for anything but a gas regulator tube. I
bet it would fire up at 150 VDC wit that nice blueish glow.

73 OM
n8zu

"raypsi" wrote in message
...

Hey OM
How old is a really really old dude? Is that like Methuselah?
Although Ima really old fart. I think there would be to much gas in
that tube for you to use it for anything but a gas regulator tube. I
bet it would fire up at 150 VDC wit that nice blueish glow.

73 OM
n8zu

Old, crotchity, and ill temptered!! Ha ha.. Definitely in the Old
Fart catagory. QST did show some circuits using the 01s in
xtal oscillators, so I know it was done.Whether it worked worth
a darn, who knows! I suffer from too much gas, but I've never
glowed like a Smurf.

Pete

raypsi wrote:
On Dec 29, 1:21 pm, "Tio Pedro" wrote:
Anyone really, really old dudes on hear who can advise
on how much RF power an 01 can handle? Can it drive
a 45 power stage?

Pete

Hey OM
How old is a really really old dude? Is that like Methuselah?
Although Ima really old fart. I think there would be to much gas in
that tube for you to use it for anything but a gas regulator tube. I
bet it would fire up at 150 VDC wit that nice blueish glow.

73 OM
n8zu
The 01A was considered a 'hard vacuum' tube, the '00 was a 'vapor' tube,
or soft vacuum tube. The only reason that the '00 was even made was
because many 'old timers' (at the time that the '00 came out) remembered
using the ORIGINAL DeForest Audio which was a soft vacuum tube. By
carefully adjusting the plate and filament voltages a very sensitive
operating point could be found. The tube was probably acting as a
thyratron at this point, on the verge of super-conduction. The '00
could also operate this way, but since it's manufacture was more
controlled than the original Audion the operating point was well known.

Even with it's 'hard vacuum' the 01 didn't have as good a 'getter' as
later tubes and would arc over with more than 130 volts or so. It was
used as a transmitter before the type 202 tube became widely available,
but was a QRP thing, less than a watt input.

"ken scharf" wrote in message
...
Even with it's 'hard vacuum' the 01 didn't have as good a 'getter' as
later tubes and would arc over with more than 130 volts or so. It was
used as a transmitter before the type 202 tube became widely available,
but was a QRP thing, less than a watt input.

Will it have enough output to drive a 245?

Tio Pedro wrote:
"ken scharf" wrote in message
...
Even with it's 'hard vacuum' the 01 didn't have as good a 'getter' as
later tubes and would arc over with more than 130 volts or so. It was
used as a transmitter before the type 202 tube became widely available,
but was a QRP thing, less than a watt input.

Will it have enough output to drive a 245?


I'm sure it will drive a neutralized 245 to provide some gain.
You might not get enough drive for full power output from the 245.
(even if the 245 was run in class A, which requires NO driving power
you would still see SOME power gain).

"Tio Pedro" wrote in message
...

"ken scharf" wrote in message
...
Even with it's 'hard vacuum' the 01 didn't have as good a 'getter' as
later tubes and would arc over with more than 130 volts or so. It was
used as a transmitter before the type 202 tube became widely available,
but was a QRP thing, less than a watt input.

Will it have enough output to drive a 245?
I doubt it very seriously. I suppose if perfection was achieved in matching
the 01's output to the 245's grid was possible (I, for one cannot do it),
the losses would be enough to tickle it into the beginning of class C.

Ken's idea of going to class A might work, but the 245 would be running
in a very inefficient mode. There is one website showing a couple of
45's running in AB2 (how do you make a sub 2?) . Another website
has some interesting stuff with 245 chatter...... (you may have already
seen it, but just in case..........

http://www.antiquewireless.org/otb/29amp.htm

Old Chief Lynn, W7LTQ and a couple commercials