Gary Schafer wrote:
Check at the center tap of the mod driver transformer with your scope and
see if you see anything there. Could be a bad or missing bypass cap there.
It's brand new but I didn't have a 15mf so I used a 47mf.. ditto for C59A.
Check the jumpers on the plug in the back to be
Jack,
The adjustable resistor (R35) has a direct affect on the screen of the
6146, so that is normal if the clamper (V6) is performing correctly.
I'm sorry, I have lost track of what you have checked/replaced, but I
would substitute a known good 6AQ5 if you haven't. You may have to
adjust R3
It's beginning to sound like a partially shorted mod transformer. With 20
volts signal on the grids of the mod tubes I would think that you should see
at least 200 volts on the plates??
Could be bad 6L6's.
The reason that you see a slightly distorted audio pattern on the audio
amplifiers when in
Rick Brashear wrote:
Jack,
The adjustable resistor (R35) has a direct affect on the screen of the
6146, so that is normal if the clamper (V6) is performing correctly.
Then why is is called the "modulator screen voltage adjustment" on the
schematic and used to adjust the mod current?
> You m
Gary has, I think, hit the tube on the plate cap.
I went looking for a set of curves for the 6L6 in my pile of old books
and data but no find yet.
Just from "rule of thumb" for audio tube amps you should get a couple
hundred volts audio swing (not related to BIRD WATTS) at each plate to
gro
Gary Schafer wrote:
It's beginning to sound like a partially shorted mod transformer.
I checked the resistances of the transformer earlier in the game and
they are nominal.
>With 20 volts signal on the grids of the mod tubes I would think that
>you should see at least 200 volts on the plat
Switch SW4b connects the resistor to the screens of the modulator tubes
when in the "Phone" mode, so it is the "modulator Screen" adjustment.
It also plays a role in the screen voltage of the 6146 final. Ideally,
if the modulator idling current is correct the screen voltage on the
final will
Jack Schmidling wrote:
Gary Schafer wrote:
It's beginning to sound like a partially shorted mod transformer.
I checked the resistances of the transformer earlier in the game and
they are nominal.
>With 20 volts signal on the grids of the mod tubes I would think
that >you should see at lea
Try again, only this time wait to push "send".
Unfortunately an ohmmeter test on the leads of a xfmr will not show a
turn to turn short in the same winding. The real way to test is send
AC, ie audio, into the iron at a modest power level and look at the
waveform coming out. Distorted wavefor
I thought I read where Jack said the scope pattern at the grids of the
modulator tubes looked altogether different than the pattern at the plate of
the driver tube. If this is true then the driver XFMR might be shorted. I
am not real familiar with the driver XFMR on the ranger but if it is one of
I will be gone this weekend and will not be able to check email till Monday.
Can't wait to see who done it.
John Coleman, WA5BXO
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Have safe and fun trip, John.
Rick/K5IZ
John E. Coleman (ARS WA5BXO) wrote:
I will be gone this weekend and will not be able to check email till Monday.
Can't wait to see who done it.
John Coleman, WA5BXO
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AMRadio mailing list
Li
A ham in Tenn asked me to list these for him. He would like to sell them or
find someone who can restore the dx 100 for him. the Apache is very nice
looks like an 8.5 with a copy of the book. The DX 100 is missing some
knobs and needs reworked someone made a lot of mods to it and he wants it
b
Great Weather we are having...
Want an ST-8000A?
- Original Message -
From: "Anthony W. DePrato" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
Sent: Friday, November 17, 2006 5:47 PM
Subject: [AMRadio] for sale dx 100 and Apache or trade
A ham in Tenn a
Another example of a reply to list reflector...
Sorry for bandwidth...
- Original Message -
From: "Bill Marx" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
Sent: Friday, November 17, 2006 5:36 PM
Subject: Re: [AMRadio] for sale dx 100 and Apache or trade
At 05:36 PM 11/17/2006 -0500, you wrote:
Great Weather we are having...
Want an ST-8000A?
Bill you know better then to ask an old rtty man that question i would have
to sell the cat to get it. hi hi.. thinning out up here just too much stuff
and not where to keep it. can not get to the glo
Larry Taft wrote:
Just from "rule of thumb" for audio tube amps you should get a couple
hundred volts audio swing (not related to BIRD WATTS) at each plate to
ground. 50 v is only a couple of watts audio.
Could you explain the math on that? How do you arrive at watts knowing
only volts?
Impedance at the plates is more than 50 ohms.
Joe W4AAB
- Original Message -
From: "Jack Schmidling" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
Sent: Friday, November 17, 2006 5:49 PM
Subject: Re: [AMRadio
Plate to plate impedance on the 6L6's is going to be in the neighborhood of
5000 to 6000 ohms. 400 volts plate to plate voltage swing would be around 26
watts of audio.
Plate voltage swing to ground would be 1/2 the above or around 200 volts to
ground for 1 tube.
Since there is about 26 volts of
- Original Message -
From: "crawfish" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
Sent: Friday, November 17, 2006 7:54 PM
Subject: Re: [AMRadio] Ranger Audio... the numbers
> Impedance at the plates is more than 50 ohms.
Some measurements:
Ranger modulat
Here is an MP3 made by KA5MIR on his Flex Radio of W4BDG/George,
K0EFJ/Brian in Ft. Scott, KS, and yours truly/W5AMI 30 mi. north of
Little Rock.
George was running an Icom 706, Brian/EFJ was on his Johnson 500, and
I am on the "1937 Bartlesville KW" currently using a single 450TL
modulated by Am
Man! What a signal. Everyone sounded good, but AMI was broadcast
quality, Southern drawl and all. That '37 Bartlesville KW was kicking
it out! If I ever get the privilege of chatting with your Brian you'll
here my unmistakable Texas drawl. Great file.. great audio!
Rick/K5IZ
A.R.S. - W5AM
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