Hello All:

http://cgi.ebay.com/QRO-HF-2500DX-Li...cm dZViewItem

Here is a QRO HF-2500 DX Linear Amplifier, GREAT!

This amp can be modified to have a small step up transformer, in the
input circuit, just like the Pride DX-300 that uses a step up
transformer. Allowing a stock radio to drive the amp to its full output,
PLUS! But the Pride DX-300 only uses a single 4CX250, with a 500 to 700
watt output with a fresh tube.

The Pride DX-300 is at http://www.cbtricks.com/ click on amp info,
then Pride.

The QRO HF-2500 DX uses two each 4CX800 Tubes, and with the right little
mod to add a step up transformer in the input circuit like the Pride
has, I am sure the 2500 watt scale on the Bird would be buried with just
a stock radio. Isn't Technology GREAT!

Would make a great project, clean output with low drive, oh yeah! Think
about all those cheap crappie amps blowing a fuse, shorting out the high
voltage, smoking up the house, and the costly repairs, sweep tubes at 80
dollars a piece, TILT! In would be money well invested, in the long run.

I am gonna send Santa an e-mail asking for one.

Or maybe ya could put a set of 4CX800 Tubes in a Pride DX-300 with a
separate power supply, now that I would pay to see. Or a set of 4CX400
Tubes, another great project!

Happy Thanksgiven to all and God Bless.

Jay in the Great Mojave Desert, ....just down the road ah ways from the
fillin station.

Miss Dinah down at the fillin station says Heah to everyone, must have
got her antenna up and running, sounds good!

"Jay in the Mojave" wrote in message
...
Hello All:

http://cgi.ebay.com/QRO-HF-2500DX-Li...cm dZViewItem

Here is a QRO HF-2500 DX Linear Amplifier, GREAT!

This amp can be modified to have a small step up transformer, in the input
circuit, just like the Pride DX-300 that uses a step up transformer.
Allowing a stock radio to drive the amp to its full output, PLUS! But the
Pride DX-300 only uses a single 4CX250, with a 500 to 700 watt output with
a fresh tube.

The Pride DX-300 is at http://www.cbtricks.com/ click on amp info, then
Pride.

The QRO HF-2500 DX uses two each 4CX800 Tubes, and with the right little
mod to add a step up transformer in the input circuit like the Pride has,
I am sure the 2500 watt scale on the Bird would be buried with just a
stock radio. Isn't Technology GREAT!

Would make a great project, clean output with low drive, oh yeah! Think
about all those cheap crappie amps blowing a fuse, shorting out the high
voltage, smoking up the house, and the costly repairs, sweep tubes at 80
dollars a piece, TILT! In would be money well invested, in the long run.

I am gonna send Santa an e-mail asking for one.

Or maybe ya could put a set of 4CX800 Tubes in a Pride DX-300 with a
separate power supply, now that I would pay to see. Or a set of 4CX400
Tubes, another great project!

Happy Thanksgiven to all and God Bless.

Jay in the Great Mojave Desert, ....just down the road ah ways from the
fillin station.

Miss Dinah down at the fillin station says Heah to everyone, must have got
her antenna up and running, sounds good!

I should get my license just so I can buy linears legally.......then sell
them illegally : )

Howdy Jay,

I like this one better...:

http://www.qrotec.com/HF25m3photos.html

3 holes are better than 2, anyday... (I'm talking about tubes! shaddap
perverts!)

:-D

-Me



On Thu, 24 Nov 2005 06:55:15 -0800, Jay in the Mojave
wrote:

Hello All:

http://cgi.ebay.com/QRO-HF-2500DX-Li...cm dZViewItem

Here is a QRO HF-2500 DX Linear Amplifier, GREAT!

This amp can be modified to have a small step up transformer, in the
input circuit, just like the Pride DX-300 that uses a step up
transformer. Allowing a stock radio to drive the amp to its full output,
PLUS! But the Pride DX-300 only uses a single 4CX250, with a 500 to 700
watt output with a fresh tube.

The Pride DX-300 is at http://www.cbtricks.com/ click on amp info,
then Pride.

The QRO HF-2500 DX uses two each 4CX800 Tubes, and with the right little
mod to add a step up transformer in the input circuit like the Pride
has, I am sure the 2500 watt scale on the Bird would be buried with just
a stock radio. Isn't Technology GREAT!

Would make a great project, clean output with low drive, oh yeah! Think
about all those cheap crappie amps blowing a fuse, shorting out the high
voltage, smoking up the house, and the costly repairs, sweep tubes at 80
dollars a piece, TILT! In would be money well invested, in the long run.

I am gonna send Santa an e-mail asking for one.

Or maybe ya could put a set of 4CX800 Tubes in a Pride DX-300 with a
separate power supply, now that I would pay to see. Or a set of 4CX400
Tubes, another great project!

Happy Thanksgiven to all and God Bless.

Jay in the Great Mojave Desert, ....just down the road ah ways from the
fillin station.

Miss Dinah down at the fillin station says Heah to everyone, must have
got her antenna up and running, sounds good!

Hello Me:

Way more Bitchen! 3 Tubes instaed of 2 4CX800 Tubes.

Now we will be crowden the 5KW slug scale, hehehhehee

Same step up transformer will work. I think they use a 9 to 1 step up
and use a 450 ohm none inductive resistor as the load, which is a good
as the impedance step up is now 450 ohms. Simply ingenious.

There ah yellin fer dinner, if my computer is taken over by small
children that should have sold on E-Bay, you will know whats ah happin!

Jay in the Mojave

Kreeditials:

Rock n Roll fan
CB radio operator
Owner 1977 Ford F250 4x4 Truck, 460 CI, no smog ****, worlds loudest PA
System, great for oldie but goodie night at the drive inn.
5 Kollage credits, 3 for passing, 2 for leavin early
Member Mojave Desert Radio Asociation (MDRA) paid 10 bucks for
membership, but didn't get change from a 10 spot, for 8 dollar
membership?!?!?!




me wrote:

Howdy Jay,

I like this one better...:

http://www.qrotec.com/HF25m3photos.html

3 holes are better than 2, anyday... (I'm talking about tubes! shaddap
perverts!)

:-D

-Me



On Thu, 24 Nov 2005 06:55:15 -0800, Jay in the Mojave
wrote:


Hello All:

http://cgi.ebay.com/QRO-HF-2500DX-Li...cm dZViewItem

Here is a QRO HF-2500 DX Linear Amplifier, GREAT!

This amp can be modified to have a small step up transformer, in the
input circuit, just like the Pride DX-300 that uses a step up
transformer. Allowing a stock radio to drive the amp to its full output,
PLUS! But the Pride DX-300 only uses a single 4CX250, with a 500 to 700
watt output with a fresh tube.

The Pride DX-300 is at http://www.cbtricks.com/ click on amp info,
then Pride.

The QRO HF-2500 DX uses two each 4CX800 Tubes, and with the right little
mod to add a step up transformer in the input circuit like the Pride
has, I am sure the 2500 watt scale on the Bird would be buried with just
a stock radio. Isn't Technology GREAT!

Would make a great project, clean output with low drive, oh yeah! Think
about all those cheap crappie amps blowing a fuse, shorting out the high
voltage, smoking up the house, and the costly repairs, sweep tubes at 80
dollars a piece, TILT! In would be money well invested, in the long run.

I am gonna send Santa an e-mail asking for one.

Or maybe ya could put a set of 4CX800 Tubes in a Pride DX-300 with a
separate power supply, now that I would pay to see. Or a set of 4CX400
Tubes, another great project!

Happy Thanksgiven to all and God Bless.

Jay in the Great Mojave Desert, ....just down the road ah ways from the
fillin station.

Miss Dinah down at the fillin station says Heah to everyone, must have
got her antenna up and running, sounds good!

: Jay in the Mojave wrote:
: This amp can be modified to have a small step up transformer,
: in the input circuit, just like the Pride DX-300 that uses a
: step up transformer.

Easy to talk about... not so easy to do in actual practice.

: Allowing a stock radio to drive the amp to its full output,

Wouldn't it be better or best to drive the amplifier with a
converted ham radio? Better performance all around...

: PLUS! But the Pride DX-300 only uses a single 4CX250, with
: a 500 to 700 watt output with a fresh tube.

Not in any case... you can't really get more than 310 watts
RMS clean output from the Pride DX-300. Both the power supply
and the tube will die a dirty death on the air... Blood from
a turnip doesn't happen.

: Or maybe ya could put a set of 4CX800 Tubes in a Pride DX-300 with a
: separate power supply, now that I would pay to see. Or a set of 4CX400
: Tubes, another great project!

Not worth it... not enough cooling to start off with.

: Jay in the Great Mojave Desert, ....just down the road ah
: ways from the fillin station.

Gas was really high priced last time I went through... :-)

cheers,
skipp
www.radiowrench.com/sonic

Hello Skip:

Long time no hear from you, hope all is well.


Skipp from radiowrench dot com wrote:

: Jay in the Mojave wrote:
: This amp can be modified to have a small step up transformer,
: in the input circuit, just like the Pride DX-300 that uses a
: step up transformer.

Easy to talk about... not so easy to do in actual practice.

Maybe not, maybe the 4CX800 tubes Pi vs G1v curve maynot need a step up
transformer. I have not looked at it,ascompared to the 4CX250 tube.

: Allowing a stock radio to drive the amp to its full output,

Wouldn't it be better or best to drive the amplifier with a
converted ham radio? Better performance all around...

Yes it would. But I would want the capibility to use both type of
radios, low and high drive.

: PLUS! But the Pride DX-300 only uses a single 4CX250, with
: a 500 to 700 watt output with a fresh tube.

Not in any case... you can't really get more than 310 watts
RMS clean output from the Pride DX-300. Both the power supply
and the tube will die a dirty death on the air... Blood from
a turnip doesn't happen.

Have you got any spectrum measuremnents on that? I would love to see
that. But I know most are driving the Pride amps to 500 and more output.
And the power supply is handling it. I know the power transformer is
rated at 1800V at 500Ma. Good for over 700 watts out.


: Or maybe ya could put a set of 4CX800 Tubes in a Pride DX-300 with a
: separate power supply, now that I would pay to see. Or a set of 4CX400
: Tubes, another great project!

Not worth it... not enough cooling to start off with.

Agreed, but all new componets would have to be used. A friend down the
road a ways has modified his Pride 300 using a 8930 Tube, which is a
military spec'ed 4cx250R Tube, and installed a larger blower. Neat-O
stuff!

Gas was really high priced last time I went through... :-)

cheers,
skipp
www.radiowrench.com/sonic

Yeah the Gas prices out here are insane.

Jay in the Great Mojave Desert, .... just down the road ah ways from
the fillin station.

Miss Dinah down at the fillin station, says that gas prices are slowly
going down, but not as fast as they went up!