I'm considering building the am/cw transmitter in the 1966 handbook
(probably in others, too). It runs a single 6146 ....
I built a similar rig, but it was weakly based on that design.
Mine had a 6GK6 oscillator and a 6146 final....

I was thinking of building a simple rig again but with a 1625 in the final.
I have about a dozen of these bottles in the junk box ....

When I find the right round tuit I want to use TEN 1625's with their
filaments series'd across the 120 VAC line in a simple CW rig. Can't
find it right now, but somewhere around here I have an article from
an old radio magazine describing just such a transmitter.

IIRC, the capacitance from ten tubes limited it to the lower HF band(s),
but it still seems like an easy way to get 750 watts!
--
--Myron A. Calhoun.
Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge
PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448
NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol)

On Sun, 22 Jan 2006 03:44:05 GMT, "Jeffrey Bauman"
wrote:

I'm considering building the am/cw transmitter in the 1966 handbook
(probably in others, too). It runs a single 6146 in the final.

I am curious if anyone has ever built that rig. If I build it, it will
probably be with an outboard power supply, and a single switch for input /
tank band switching.

Also curious: Anyone ever homebrewed a DX-60?

Jeff
W8KZW

I have the "Inexpensive 75-Watt Transmitter" from the 1964 Handbook.
It's a 12BY7 oscillator driving a 1625. I bought it on eBay a couple
of years ago, and it looks just like the one in the Handbook, with the
vertically mounted meter, coil shields and exact layout. For some
reason, it got painted black somewhere along the way.

I tried it out a few months ago, and should have reformed the caps.
Kerpow!!! So, I've got some work to do on it.
Ted KX4OM

I built one around '62-'63 from the Handbook. It was ONLY a 6146 amp. I
duplicated the osc/driver of the Eico 720 to drive it. I think the amp had
a "gimmic* neutralizing cap. I'll probably find it in my mom's house when I
have to sell it.
73, Steve, K,9.D;C'I



"Jeffrey Bauman" wrote in message
link.net...
I'm considering building the am/cw transmitter in the 1966 handbook
(probably in others, too). It runs a single 6146 in the final.

I am curious if anyone has ever built that rig. If I build it, it will
probably be with an outboard power supply, and a single switch for input /
tank band switching.

Also curious: Anyone ever homebrewed a DX-60?

Jeff
W8KZW

Forgot. 3885 is an AM freq and I think 7295, but not sure. You'll also
hear some on 160.
73, K9DCI


"Mike W" wrote in message
...
On Sun, 22 Jan 2006 15:17:47 -0500, "wa2mze(spamless)"
wrote:


You might as well leave out the
AM modulator since it will be useless today. Back in '66-'67 there
were still some people on AM (mostly on 80 and 10 meters), but today
it's completly gone.

Thats interesting, I wonder what mode I was using on 2m last Sunday
morning?.
It was an AM qso over a distance of about 90 miles, received an R5-S3
and gave an R5-S2. Both of us were running about 2.5w
--

"wa2mze(spamless)" wrote in message
...
Jeffrey Bauman wrote:
I'm considering building the am/cw transmitter in the 1966 handbook
(probably in others, too). It runs a single 6146 in the final.

I am curious if anyone has ever built that rig. If I build it, it will
probably be with an outboard power supply, and a single switch for input
/
tank band switching.

Also curious: Anyone ever homebrewed a DX-60?

Jeff
W8KZW


I built a similar rig, but it was weakly based on that design.
Mine had a 6GK6 oscillator and a 6146 final. It was built inside
a chassis with the tubes mounted on a subchassis inside. The tubes
were "sideways" and holes were drilled in the chassis-cabinet for
ventilation.

I am assuming the same transmitter was described in the 1967 HB (which
was the first HB I ever bought). You might as well leave out the
AM modulator since it will be useless today. Back in '66-'67 there
were still some people on AM (mostly on 80 and 10 meters), but today
it's completly gone. Low cost SSB xcvrs wiped out AM by the mid 1970's.

I was thinking of building a simple rig again but with a 1625 in the
final.
I have about a dozen of these bottles in the junk box along with half as
many
6AG7's. The crystals will be the scarce items these days (well expensive
anyway).


Just curious why you think the AM modulator will be "useless today" ?????
I'll have to tell those AMers running DX-?? equipment to stop talking into
the mic, right?

Dan/W4NTI

I was thinking of building a simple rig again but with a 1625 in the
final.
I have about a dozen of these bottles in the junk box ....

When I find the right round tuit I want to use TEN 1625's with their
filaments series'd across the 120 VAC line in a simple CW rig. Can't
find it right now, but somewhere around here I have an article from
an old radio magazine describing just such a transmitter.

IIRC, the capacitance from ten tubes limited it to the lower HF band(s),
but it still seems like an easy way to get 750 watts!
--
--Myron A. Calhoun.

Hey, Man, I don't know about TEN 1625's, but I did try five 1625's (in
parallel, of course) and could work up to 40 CW....... (as an American in
France, F7CT). Almost 1000VDC on the plates, and they did get pretty rosy
on a long "dah". 1625's could be drawn by the basket full from the MARS
storeroom at Toul Rosieres Air Base, France. 1962......1963?
Old Chief Lynn...... W7LTQ

garigue wrote:
You might as well leave out the
AM modulator since it will be useless today. Back in '66-'67 there
were still some people on AM (mostly on 80 and 10 meters), but today
it's completly gone.

OH, Really!?? Snert! - Sporf! - Snurt! TNX for the laugh!

Jonesy
--
Marvin L Jones | jonz | W3DHJ | linux
Pueblo, Colorado | @ | Jonesy | OS/2 __
38.24N 104.55W | config.com | DM78rf | SK


Yepper ....just like the fellow on 2 meters said .......nobody uses CW
anymore .....its DOA . I just like to put up my feet, lean back, and open
an Iron City Beer and enjoy the quality of those AM signals ... and this
from a 99.99% CWist. My buddy built on of those rigs in 66 and it worked
fine with his Mor-Gain antenna ...even with the hardware cloth safety mesh
covering the chassis. Lots 'o fun.

God Bless and 73 all ..... KI3R Tom in Belle Vernon PA


Well I havn't heard any AM on the HF bands in a long time, but I stand
corrected that some people still use it. Granted it's in the minority
and on "calling frequencies". I don't think those screen grid modulators
found in novice rigs were of much use though. They didn't have
much punch and poor audio. If you are going to go AM, a real plate
modulator is the only way to go. (I shudder to think what a plate
modulation transformer would cost these days....)

Mike W wrote:
On Sun, 22 Jan 2006 15:17:47 -0500, "wa2mze(spamless)"
wrote:



You might as well leave out the
AM modulator since it will be useless today. Back in '66-'67 there
were still some people on AM (mostly on 80 and 10 meters), but today
it's completly gone.


Thats interesting, I wonder what mode I was using on 2m last Sunday
morning?.
It was an AM qso over a distance of about 90 miles, received an R5-S3
and gave an R5-S2. Both of us were running about 2.5w
--


I remember having a Gonset 2m communicator I as a novice.
Is there any am left on 2m? Can those new multi mode rigs
even transmit on am?

I never said AM doesn't have it's place. It's gone as a DX mode,
but on a quiet band is great for rag chewing.

Lynn Coffelt wrote:
I was thinking of building a simple rig again but with a 1625 in the

final.

I have about a dozen of these bottles in the junk box ....

When I find the right round tuit I want to use TEN 1625's with their
filaments series'd across the 120 VAC line in a simple CW rig. Can't
find it right now, but somewhere around here I have an article from
an old radio magazine describing just such a transmitter.

IIRC, the capacitance from ten tubes limited it to the lower HF band(s),
but it still seems like an easy way to get 750 watts!
--
--Myron A. Calhoun.


Hey, Man, I don't know about TEN 1625's, but I did try five 1625's (in
parallel, of course) and could work up to 40 CW....... (as an American in
France, F7CT). Almost 1000VDC on the plates, and they did get pretty rosy
on a long "dah". 1625's could be drawn by the basket full from the MARS
storeroom at Toul Rosieres Air Base, France. 1962......1963?
Old Chief Lynn...... W7LTQ


Let's see... the output C of an 807 (1625 is the same) is 7pf, the input C
is 12pf. With 10 tubes thats 70pf output and 120pf input. Won't work
at all on 10m, and iffy on 20. Would be fine on 80 and 40.

Dan/W4NTI wrote:
"wa2mze(spamless)" wrote in message
...

Jeffrey Bauman wrote:

I'm considering building the am/cw transmitter in the 1966 handbook
(probably in others, too). It runs a single 6146 in the final.

I am curious if anyone has ever built that rig. If I build it, it will
probably be with an outboard power supply, and a single switch for input
/
tank band switching.

Also curious: Anyone ever homebrewed a DX-60?

Jeff
W8KZW



I built a similar rig, but it was weakly based on that design.
Mine had a 6GK6 oscillator and a 6146 final. It was built inside
a chassis with the tubes mounted on a subchassis inside. The tubes
were "sideways" and holes were drilled in the chassis-cabinet for
ventilation.

I am assuming the same transmitter was described in the 1967 HB (which
was the first HB I ever bought). You might as well leave out the
AM modulator since it will be useless today. Back in '66-'67 there
were still some people on AM (mostly on 80 and 10 meters), but today
it's completly gone. Low cost SSB xcvrs wiped out AM by the mid 1970's.

I was thinking of building a simple rig again but with a 1625 in the
final.
I have about a dozen of these bottles in the junk box along with half as
many
6AG7's. The crystals will be the scarce items these days (well expensive
anyway).



Just curious why you think the AM modulator will be "useless today" ?????
I'll have to tell those AMers running DX-?? equipment to stop talking into
the mic, right?

Dan/W4NTI


I stand corrected that some people are still rag chewing on AM.
I never did like the screen modulator's though. No punch.