Highland Ham wrote:

In your opinion, which commonly available tubes sound appropriate? I'm
particularly interested in hearing from hams that have built units with
similar DC supplies.

This is likely to be a long term project, with minimum amount of time to
work on it at a time, and likely extensive amounts of time to find
appropriate components at a reasonable cost (think beer budget and
champagne dreams)..

==========================================
If second hand tubes are not considered I suggest to have a look at the
Svetlana web site.
If valves can provide the wanted power at 29 MHz ,they certainly can do at
1.8 MHz.

If Eimac or similar tubes are available like the 3-500Z , 2 of those in
parallel are fine and so is a single 8877 or 3CX1500

Ref ARRL Handbook 1995 (and probably others) ,chapter 13

Good Luck with your project

Frank GM0CSZ / KN6WH





Alas, the Svetlana site has expired -- Svetlana USA is not owned by the
company that owns the Svetlana factory, and they've had a falling out.
The Svetlana factory in Russia now markets their tubes as "circle C"
(the Tubes Formerly Known As Svetlana?), but all the nifty articles
aren't accessible.

The ARRL makes sure to include a few linear projects in each handbook,
so there's plenty of choices. I'd make concrete suggestions, but 5
watts is QRO for me.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Behold, Tim Wescott signalled from keyed 4-1000A filament:

Highland Ham wrote:

In your opinion, which commonly available tubes sound appropriate? I'm
particularly interested in hearing from hams that have built units with
similar DC supplies.

This is likely to be a long term project, with minimum amount of time
to work on it at a time, and likely extensive amounts of time to find
appropriate components at a reasonable cost (think beer budget and
champagne dreams)..

========================================== If second hand tubes are not
considered I suggest to have a look at the Svetlana web site. If valves
can provide the wanted power at 29 MHz ,they certainly can do at 1.8
MHz.

If Eimac or similar tubes are available like the 3-500Z , 2 of
those in parallel are fine and so is a single 8877 or 3CX1500

Ref ARRL Handbook 1995 (and probably others) ,chapter 13

Good Luck with your project

Frank GM0CSZ / KN6WH





Alas, the Svetlana site has expired

Not if you know where to look ;-)

http://www.svetlana.com/docs/tubeframe.html

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca

Gregg wrote:
Behold, Tim Wescott signalled from keyed 4-1000A filament:


Highland Ham wrote:


In your opinion, which commonly available tubes sound appropriate? I'm
particularly interested in hearing from hams that have built units with
similar DC supplies.

This is likely to be a long term project, with minimum amount of time
to work on it at a time, and likely extensive amounts of time to find
appropriate components at a reasonable cost (think beer budget and
champagne dreams)..

========================================== If second hand tubes are not
considered I suggest to have a look at the Svetlana web site. If valves
can provide the wanted power at 29 MHz ,they certainly can do at 1.8
MHz.

If Eimac or similar tubes are available like the 3-500Z , 2 of
those in parallel are fine and so is a single 8877 or 3CX1500

Ref ARRL Handbook 1995 (and probably others) ,chapter 13

Good Luck with your project

Frank GM0CSZ / KN6WH






Alas, the Svetlana site has expired


Not if you know where to look ;-)

http://www.svetlana.com/docs/tubeframe.html


How cool. There has to be some kind of saga behind this whole Svetlana
business.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Gregg wrote:
Behold, Tim Wescott signalled from keyed 4-1000A filament:


Highland Ham wrote:


In your opinion, which commonly available tubes sound appropriate? I'm
particularly interested in hearing from hams that have built units with
similar DC supplies.

This is likely to be a long term project, with minimum amount of time
to work on it at a time, and likely extensive amounts of time to find
appropriate components at a reasonable cost (think beer budget and
champagne dreams)..

========================================== If second hand tubes are not
considered I suggest to have a look at the Svetlana web site. If valves
can provide the wanted power at 29 MHz ,they certainly can do at 1.8
MHz.

If Eimac or similar tubes are available like the 3-500Z , 2 of
those in parallel are fine and so is a single 8877 or 3CX1500

Ref ARRL Handbook 1995 (and probably others) ,chapter 13

Good Luck with your project

Frank GM0CSZ / KN6WH






Alas, the Svetlana site has expired


Not if you know where to look ;-)

http://www.svetlana.com/docs/tubeframe.html


How cool. There has to be some kind of saga behind this whole Svetlana
business.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Behold, Tim Wescott signalled from keyed 4-1000A filament:

Highland Ham wrote:

In your opinion, which commonly available tubes sound appropriate? I'm
particularly interested in hearing from hams that have built units with
similar DC supplies.

This is likely to be a long term project, with minimum amount of time
to work on it at a time, and likely extensive amounts of time to find
appropriate components at a reasonable cost (think beer budget and
champagne dreams)..

========================================== If second hand tubes are not
considered I suggest to have a look at the Svetlana web site. If valves
can provide the wanted power at 29 MHz ,they certainly can do at 1.8
MHz.

If Eimac or similar tubes are available like the 3-500Z , 2 of
those in parallel are fine and so is a single 8877 or 3CX1500

Ref ARRL Handbook 1995 (and probably others) ,chapter 13

Good Luck with your project

Frank GM0CSZ / KN6WH





Alas, the Svetlana site has expired

Not if you know where to look ;-)

http://www.svetlana.com/docs/tubeframe.html

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca