Garey,
Hi...
I was just reading a post you made on reduced drive to the L-4B from
the T-4any.
You mentioned having the load at 0.
Are you talking the T-4any or the L-4B as to the loading on 0...I
suspect it is the T-4any.
What if we load up the T-4any to a lower power out by putting the
load
I have this problem with my vintage AM station, I use a Yaesu FL2100B with a
Johnson Viking-II and to lower the drive level I use a coaxual T placing a
dummy load on the T and continue the coax to the anplifier.
- Original Message -
From: drakelist-boun...@zerobeat.net
To: drakelist@ze
John,
So what is the details of this setup? How much power goes to the amp,
with the dummy load in the circuit?
My Alpha only need 35 - 40 watts drive to put out 1500. I usually like
to run it with 25 watts drive.
Also, I don't want to run my L-4B at full throttle either (800-1,000
out)
73,
This is just my own experience running a T4x into a KW linear that
needed 30W of drive (pair of 4cx300 grid driven)
While the T4 loading control will reduce the output, it tends to make
the output non-linear from the T4X. It is better, signal quality wise,
to tune the load control properly a
Curt -
That is yet another way. I'm not sure why using reduced loading would
make the output non-linear It's a 'linear' amplifier which implies
that it's 'linear' from zero to full output. It may be that one of the
lower level stages are distorting, but I'm not sure why they would.
Us
This is why I use a 100 watt dummy load, is has the capability to dissipate the
heat of 75 watts.
- Original Message -
From: drakelist-boun...@zerobeat.net
To: drakelist@zerobeat.net
Sent: Tue Apr 26 10:59:55 2011
Subject: Re: [Drakelist] L-4B reduced power
Curt -
That is yet another
That's ok, but the transmitter is also loading into a 25 ohm load, or
2:1 SWR. Not that that is particularly bad, but it might limit the
transmitter capability.
Have you ever used a scope to see what the signal looks like? I know
several people who have used this method, but none have ever
The SW-4A amp is not push pull, neither is the amp in the R-4A or R-4B.
However, the SW-4 does have a push pull amp with two 6AQ5s and 1/2 of a 12AX7
as a phase inverter.
Most audio amps consist of two stages. The first is a voltage amp, usually a
triode such as one unit of a 12AX7 but someti
A transistorized PP stage can be of significant benefit in a Drake receiver. I
was able to reduce the heat and current demands using a simple PP design in a
R-4B. The added benefit is extremely low noise, low quiescent current, and low
distortion without the need for an audio output transforme
I always attributed the non-linearity to mismatch issues. As soon as
impedance mismatch is present, the output can become distorted.
Also, when speaking of using a scope on the output, you can't just
monitor the amplitude envelope, you need to be looking at the
trapezoid. When the loading is
- Original Message -
From: "John Boyle"
To:
Sent: Tuesday, April 26, 2011 11:55 AM
Subject: [Drakelist] SW-4A amp
The SW-4A amp is not push pull, neither is the amp in the
R-4A or R-4B. However, the SW-4 does have a push pull amp
with two 6AQ5s and 1/2 of a 12AX7 as a phase inver
Hi Gang,
Well, it's great news, I finally got my TR-3 working. Lots of tense
moments, as I mentioned in my last post, the short circuit pointed straight to
the meter itself. I still can't believe a meter could draw that much
amperage. It made the carbon trace in the zeroing pot red hot.
Where physically in the R4A is the crystal lattice filter?
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