It sounds like something has changed in the antenna system or feed line.
Bry, AF4K
Hi to all
My T4X-C always put out about 110 -120 watts, less on 20 - 10
meters. On 40 meters there was
always RFI problems with our organ.
Today, the T4X-C was putting out 150 watts on 80 meters. All the
Thanks to all who replied. At this time, the rig is working for unknown
reasons. I guess it is going to be a PITA intermittent.
I so often see a problem on the list and then see thanks but never the answer
as to what fixed the issue. For those looking in the archives for answers, it
is a
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set up. If you have not made your plans to attend, you need
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Richard -
That is an excellent book. All those terms are just fancy names for
what we call GAIN. Simply put, it refers to what happens if we put
filament, plate, (screen) and grid potentials on a tube, and then
wiggle the voltage on the grid, what happens to the current through
the tube.
Good Morning All:
Regarding my TR7:
It has AC on the carrier in CW mode. It looks to have original caps in
the PS7 and I just havent gotten around to replacing them. I have also
noted taht the rx signal has a scratchineess on it ..especially when
using the narrower filters. It isn't audio
Hi to all:
After aligning the T4X-C the power output is equal when switching between R4-C
or T4X-C control via the transcieve switch on the transmitter.
Now, the output is lower when the transcieve switch is in the T4X-C position.
This is for 80 meters. I aligned the transmitter again and
I would add one thing to Gary's suggestion below. You have had the DR-7
board in and out a time or two, and those long pins have a problem of
cracking the solder joints. The two sets of pins on the left side, the
ones where the bypass board plug in, are what takes the codes from the
Richard -
This might be due to relay K2 contacts. This is the relay that shifts
the Carrier Oscillator to within the LSB filter passband for CW
operation. Be worthwhile to clean those contacts with a little DeoxIT
soaked paper strip.
** This may be one of those, shoulda' sent it in
I have had good luck with a Jackson 648A tester. It is not an expensive Hickok
mutual conductance tester. It uses a Dynamic testing circuit and there is
much debate if that is really better than simple emission testing. But it does
have a test I have found useful. It has a “Life Line Indicator”
On Sun, 31 Jan 2010 03:46:11 -0800 (PST), Ron wrote:
Thanks to all who replied. At this time, the rig is working for unknown
reasons. I guess it is going to be a PITA intermittent.
Don't feel too bad, I had an intermittent with my DR7 board that took me
several years of now-and-then
On Sun, 31 Jan 2010 10:35:49 -0500, Curt Nixon wrote:
Good Morning All:
Regarding my TR7:
It has AC on the carrier in CW mode.
that could do this. Filters on the PS board in the TR perhaps?
Could be, but I would say replace them anyway. I always say that. They are
getting old and will
On Sun, 31 Jan 2010 11:13:53 -0500, Garey Barrell wrote:
I would add one thing to Gary's suggestion below. You have had the DR-7
board in and out a time or two, and those long pins have a problem of
cracking the solder joints.
Excellent advice. I will add to that, the female contacts can
On Sun, 31 Jan 2010 08:18:24 -0800 (PST), Robert Ladden wrote:
I have had good luck with a Jackson 648A tester. It is not an expensive Hickok
mutual conductance tester. It uses a Dynamic testing circuit and there is
much debate if that is really better than simple emission testing. But it does
Bob -
That's a very good site reference. Lots of good information there.
The Life Test typically just reduces the filament voltage on the
tube. This indicates whether the cathode is straining to deliver enough
electrons, (wearing out,) or has life left! If the meter indications
stays
-I have a Hickock that my bookeeper gave me 35 years ago (her husband
liberated it from the phone co,)
Great unit...still works good
73 Bud WØHG
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Hmm. Several oddities with this.
1. Usually lower transmitter output is experienced when RCVR control is
selected, bringing the PreMixer signal over from the receiver.
2. If it was a cable problem, 80M is the least likely to have increased
losses as it is the lowest frequency
I'll second the Jackson 648. I have an older and a later model 648A. Did not
know about Vacuum Tube inc doc. It looks like I may have most of the factory
data (manuals, test charts, updates) but for the price I think I'll get a copy.
Thanks Bob!!!
It's not perfect, but is great for finding
Good Afternoon,
My TR-7's PBT pots have finally reached the point of failing to maintain the
correct frequency for both U/Lsb. I am going to replace all 5 pots when I
pull the board and was wondering if anyone has had much luck finding higher
quality replacements? I am considering 15-20 turn
You need one Bourns 1k pot 3296W-1-102LF for the
10 volt adjustment, and 5 Bourns 10k pots
3296W-1-103LF for the passband frequency adjustments.
They are $2.19 each at Newark. You also have to
move the resistors in between the original pots to the backside of the board.
Here is a link to a
I need a regulator card from a PS 7. Anyone out there have one available?
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That got me wondering how much the life test drops the filament voltage. I put
a 6JB6A in my tester and measured the filament voltage. The tester's normal
6.3V was really 6.2V. The life test dropped it to 5.6V. On a 12AX7 it dropped
from 12.7V to 11.6V. So it only drops the voltage about 9%.
SP 75 is in great condition and is working. I used it on my TR 7 and got very
good audio reports. Extra punch helps sometimes. I am selling my 7 line so
this SP 75 is surplus to my needs. Priced at 110.00 shipped Paypal
preferred. I have pics if you like to see the unit.
Dennis
Ok, The Antenna selector switch on my MN-2700 suddenly went weird - I could
not select anything - it seemed like none of the detents would engage. I
opened the unit up and after some poking around realized that the detent
part of the switch which is in the front is only tied to the inner
Yep, just about one step on the filament select switch! :-)
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs
www.k4oah.com
Robert Ladden wrote:
That got me wondering how much the life test drops the filament voltage. I put a 6JB6A in
my tester and
Thanks to all who replied, have the info that I needed. Better research on
my part would have found this, but nice to have the resource.
73,
Robb NØRU
Woodland Park, CO.
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There is a very thin piece of double sided tape on the far right side
of the front panel. That and the meter hold the panel on.
73, Joe KC9LAD
At 10:18 PM 1/31/2010, you wrote:
Ok, The Antenna selector switch on my MN-2700 suddenly went weird -
I could not select anything - it seemed like
Greetings:
I still haven't fixed my R-7 yet but I'm making progress. I bought a digital
control board from a TR-7 tried it found that all but the lowest 3 bands
worked; the board outputs for the 3 bands that didn't work were all continually
low, incidentally, while the outputs from the PROM
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