(Mike Andrews) wrote:

: In .com (rec.radio.amateur.homebrew), Dave wrote:
:
: What sort of plate caps were used? There are just pins, and
: it looks almost as if there would have been a ceramic gizmo
: like a tube socket to have bridged the two of them....
:
: On the transmitter for the AN/ARC-3, the plate leads just had push-on
: clips with a little bit of spring-loading, much like the contacts in a
: tube socket.

In the RSGB Amateur Radio Handbook 3rd Ed. they went so far (full
construction details) as to give details of a drilled and tapped (for grub
screw) 3/4" x 5/16" brass rod, for QQV06-40 / 5894 (has thicker pins)!

You might consider using the brass inserts from terminal connector blocks,
which already have grub screws and come in at least a couple of sizes.

Since the anode tank circuits then often used flexible copper strip to
possibly more brass rod in these British circuits, a bit of heat-sinking
would be taking place as well, I think. May as well use a heavy contact.

The 829B needs external neutralising, unlike 5894 with it built-in.

I could scan the few pages of the 1947 ARRL I have showing 829B, but you
might want to find the few years following for more, maybe improved ones.

In .com (rec.radio.amateur.homebrew), Dave wrote:

What sort of plate caps were used? There are just pins, and
it looks almost as if there would have been a ceramic gizmo
like a tube socket to have bridged the two of them....

On the transmitter for the AN/ARC-3, the plate leads just had push-on
clips with a little bit of spring-loading, much like the contacts in a
tube socket.

--
You haven't lived until you've seen the households Great Hunter
Panther^wtomcat cowering in terror under a bush after being
caught in an instant thunderstorm on a sunny day.
-- Lionel, about his owner, in the Monastery

Dave wrote:
Many thanks to all who replied, both here and by email.
They sound like a great tube for LOTS of purposes. My
favorite suggestion was building a regen, using each
half in place of the 6AQ5's called for in the ARRL handbook
design from the 50's!

How about an oscillator / amplifier for HF, running low
plate voltage for a relatively low RF output? Seems they
should be able to do that - and having a separate oscillator
stage it wouldn't be prone to runaway and exessive crystal
current. And it would look VERY cool!

If I recall, the 829 is one of the tubes with the cathodes tied
together to a single pin, isn't it? This reduces the utility for
such things.

What sort of plate caps were used? There are just pins, and
it looks almost as if there would have been a ceramic gizmo
like a tube socket to have bridged the two of them....

They are little ceramic clips. You can use Molex pins in a pinch.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Dave wrote:
Many thanks to all who replied, both here and by email.
They sound like a great tube for LOTS of purposes. My
favorite suggestion was building a regen, using each
half in place of the 6AQ5's called for in the ARRL handbook
design from the 50's!

How about an oscillator / amplifier for HF, running low
plate voltage for a relatively low RF output? Seems they
should be able to do that - and having a separate oscillator
stage it wouldn't be prone to runaway and exessive crystal
current. And it would look VERY cool!

If I recall, the 829 is one of the tubes with the cathodes tied
together to a single pin, isn't it? This reduces the utility for
such things.

What sort of plate caps were used? There are just pins, and
it looks almost as if there would have been a ceramic gizmo
like a tube socket to have bridged the two of them....

They are little ceramic clips. You can use Molex pins in a pinch.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

"Dave" wrote in message
news.com...
Many thanks to all who replied, both here and by email.
They sound like a great tube for LOTS of purposes. My
favorite suggestion was building a regen, using each
half in place of the 6AQ5's called for in the ARRL handbook
design from the 50's!

How about an oscillator / amplifier for HF, running low
plate voltage for a relatively low RF output? Seems they
should be able to do that - and having a separate oscillator
stage it wouldn't be prone to runaway and exessive crystal
current. And it would look VERY cool!


I'd think running the 829 in parallel for a HF PA, with another
829 as a P-P modulator would be a neat project.

Pete

"Dave" wrote in message
news.com...
Many thanks to all who replied, both here and by email.
They sound like a great tube for LOTS of purposes. My
favorite suggestion was building a regen, using each
half in place of the 6AQ5's called for in the ARRL handbook
design from the 50's!

How about an oscillator / amplifier for HF, running low
plate voltage for a relatively low RF output? Seems they
should be able to do that - and having a separate oscillator
stage it wouldn't be prone to runaway and exessive crystal
current. And it would look VERY cool!


I'd think running the 829 in parallel for a HF PA, with another
829 as a P-P modulator would be a neat project.

Pete

"Dave" wrote in message tnews.com...

What sort of plate caps were used? There are just pins, and
it looks almost as if there would have been a ceramic gizmo
like a tube socket to have bridged the two of them....

Fahnestock clips work fine, and they're easy enough to find (e.g.
Mouser), and they even add a bit of heat-sinking. BTW, to connect
both plates in parallel, put a clip on each plate, line them up
together and run a connecting wire through the screw holes, then
solder the whole thing (quickly) and you'll have a perfectly-fitting
dual plate cap.

73,
Mike, KK6GM

"Dave" wrote in message tnews.com...

What sort of plate caps were used? There are just pins, and
it looks almost as if there would have been a ceramic gizmo
like a tube socket to have bridged the two of them....

Fahnestock clips work fine, and they're easy enough to find (e.g.
Mouser), and they even add a bit of heat-sinking. BTW, to connect
both plates in parallel, put a clip on each plate, line them up
together and run a connecting wire through the screw holes, then
solder the whole thing (quickly) and you'll have a perfectly-fitting
dual plate cap.

73,
Mike, KK6GM

On Fri, 06 Feb 2004 01:03:55 GMT, "Dave" wrote:

|Hi all,
|
|I just found several 829B tubes - believe it or not in my garage - I
|must have got them in a box of stuff at a ham fest at one time.
|A check on Ebay shows they're pretty much worthless for the sake
|of dollars, but they're so COOL! With the two plate caps that are
|actually just stiff pins, they look like little Martians.
|
|I put a pair on my office credenza just to look geeky cool. Fresh
|out of the box as NOS they look amazing - just like they were made
|yesterday. It's a pity they have no value - maybe as a homebrew
|project??
|
|So can someone tell me what they would have been used for?
|Something tells me they're a VHF power tube.
|
|Any application as a one-tube QRP rig of any sort? Any stories
|about using them in the past? I've built a lot of little rigs over the
|years, but never knew about the 829

I used one on two meters in the early 60's. The amp was of course
push-pull and had a tuned line plate circuit with link coupling. I
ran AM and CW and used the modulated high voltage out of my Heathkit
DX-100 for plate and screen voltage.

The original exciter was a converted SCR-522, which used the 829's
baby brother, the 832 as frequency multipliers and final. Later I
replaced the 829 with a 5894 and the 832s with a baby version of the
'94, whose part number escapes me at the moment (6907 I think).

These later tubes were more efficient at vhf and were tetrodes rather
than the 832-829 "beam-power" tubes. The 832 was sort of like a pair
of 2E26s sharing a cathode and the 829 was sort of like a pair of
807s.

Eventually, I replaced the clunky '522 with a more compact exciter out
of the Handbook that used somethin' or the other as
oscillator/doubler/tripler and a 6360 tripler driving another 6360.

Real progress came when I converted the second 6360 to a high level
mixer driven with a Central Electronics 10A SSB exciter. (I don't even
want to think what the IMD out of this mess must have been.)

To see the tube photo -- go to googe.com type in "829B tubes"
Select IMAGES not web.

I recall these in Military Aircraft of the 50's --- I believe ARC-27 -- a
UHF Transceiver by Collins Radio

The ARC-1 Transceiver used a smaller rounded version 832B -- we called them
door knob tubes -- see google

So would make a VHF/UHF power output stage maybe 10 watts or so

--
73- Cambio - Keyboard To You (:-)
-----------------------------------
"Dave" wrote in message
news.com...
Hi all,

I just found several 829B tubes - believe it or not in my garage - I
must have got them in a box of stuff at a ham fest at one time.
A check on Ebay shows they're pretty much worthless for the sake
of dollars, but they're so COOL! With the two plate caps that are
actually just stiff pins, they look like little Martians.

I put a pair on my office credenza just to look geeky cool. Fresh
out of the box as NOS they look amazing - just like they were made
yesterday. It's a pity they have no value - maybe as a homebrew
project??

So can someone tell me what they would have been used for?
Something tells me they're a VHF power tube.

Any application as a one-tube QRP rig of any sort? Any stories
about using them in the past? I've built a lot of little rigs over the
years, but never knew about the 829

Thanks,

Dave