> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of A.R.S. - WA5AM
> Sent: Thursday, March 06, 2008 10:43 AM
> To: Discussion of AM Radio in the Amateur Service
> Subject: Re: [AMRadio] Drake L-4B on AM
>
> On Thu
About the use of a linear on AM . . .
Years ago Continental Electronics in Dallas had a series of
screen-modulated AM broadcast transmitters. Their audio
quality was very good but their efficiency was absolutely
terrible. One of the sales guys said that the only way to
run those rigs was to ei
I use an Amp Supply LK-500ZB with either a DX-60 OR a TS-930SAT.
Tune for 20W carrier out of rig - tune for MAX CRAX out of Amp.
The LK-500ZB is a pair of 3-500Zs. Been running them for about 8 years,
AND they weren't new to begin with.
They do JUST fine!
I now have two BC-610s, so the othe
On Thu, Mar 6, 2008 at 9:37 AM, kenw2dtc <[EMAIL PROTECTED]> wrote:
> "BTW, I tuned the amp for exactly 1500 watts output, then reduced the drive
> to exactly 25 watts without re-tuning the amplifier"
>
> Actually the best way is to tune for 1500 watts out and reduce the drive
> until the output
"BTW, I tuned the amp for exactly 1500 watts output, then reduced the drive
to exactly 25 watts without re-tuning the amplifier"
Actually the best way is to tune for 1500 watts out and reduce the drive
until the output is 375 watts under carrier conditions. Also if you have
one of those male
On Thu, Mar 6, 2008 at 10:15 AM, A.R.S. - WA5AM <[EMAIL PROTECTED]> wrote:
> The 8877 is a 1500 watt tube, and the plates
> are tough with forced air cooling, but they are also real expensive.
> It runs much hotter on AM with very little drive, than it does on SSB
> with drive levels up to 65
Thursday, March 06, 2008 7:35 AM To:
> amradio@mailman.qth.net Subject: [AMRadio] Drake L-4B on AM
>
> Hi everybody,
>
> Was wondering if there are any out there that can tell me if a Drake
> L-4B amp plays nice on AM?
>
> I have one here that I got from a retired ham and would lo
On Thu, Mar 6, 2008 at 9:24 AM, Bob Bruno - K2KI <[EMAIL PROTECTED]> wrote:
>
> Hi Brian,
>
> That was the direction of my thinking. Thus the question that I posed.
>
> I figured that the efficiency would suffer terribly but did not figure them
> to be as bad as the calculations you provided...
On Thu, Mar 6, 2008 at 9:15 AM, A.R.S. - WA5AM <[EMAIL PROTECTED]> wrote:
> Just something to consider when using a linear amp for AM service...
>
BTW, I tuned the amp for exactly 1500 watts output, then reduced the
drive to exactly 25 watts without re-tuning the amplifier.
_
On Thu, Mar 6, 2008 at 8:17 AM, Bob Peters <[EMAIL PROTECTED]> wrote:
> Bob...I run an L-7 on AM and drive it at about 30 watts and getting a
> solid 300 watts out and peaking about 500 ...Using a rice box to drive
> it... Works well... Same amp.
>
I have a Henry 3K Classic-X with the heavy 4000
, March 06, 2008 7:35 AM
To: amradio@mailman.qth.net
Subject: [AMRadio] Drake L-4B on AM
Hi everybody,
Was wondering if there are any out there that can tell me if a Drake
L-4B amp plays nice on AM?
I have one here that I got from a retired ham and would love to add it
to the AM station I am
The L4B will work well, mine does. Drive it with no more than about 25W
maximum. This will get you about 250W out (+/-)from the amp, which is more
than enough, and close to the maximum ratings of the tubes.
My L4B has improvements from Harbach and the Heathkit Shop, upgraded power
supplies, step-
Hi everybody,
Was wondering if there are any out there that can tell me if a Drake
L-4B amp plays nice on AM?
I have one here that I got from a retired ham and would love to add it
to the AM station I am putting together for those times that a DX-100
signal will do well barefoot.
Any info
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