Tony, check CR19 in the cathode circuit of the 12BY7 driver. You can check it
with the rig unpowered (safest method) with a VOM or DMM in the resistance
mode. The diode may test OK when cold. Touch a soldering iron to either end of
the diode. If the diode is intermittent, the heat will cause
Brett, there is probably nothing wrong with the rig. In all likelihood, you
have inadvertently tuned to the carrier oscillator at 5.645-MHz. Try again with
the RX Preselector and the TX RF Tune in the 40M marks on the front panel.
73,Bob K9JU
On Saturday, October 14, 2017 12:00 PM,
George, the ball bearings are 1/8 diameter and it takes 10 in the race. Here
is a McMaster-Carr link from WA6FWI:
http://www.mcmaster.com/#9291k43/=x0zm8t
Bob K9JU
On Friday, May 22, 2015 11:00 AM, drakelist-requ...@zerobeat.net
drakelist-requ...@zerobeat.net wrote:
Send
for the ALS-600 amplifier. He changed to
the Omron relay from the Panasonic due to faster switching speed. My first pass
used the Panasonic. It was noisier than the Omron but not near the racket of
the Drake relay.
73,
Bob Loving K9JU
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Hi, Lee:
Have you seen the February 2005 QST article in Hints Kinks (pp 72-73) about a
replacement for the R-4B dial? If not and you are an ARRL member, you can find
it in the archives at the ARRL website.
73,
Bob K9JU
(Snowy and cold) Streamwood, IL
Hi, Howard:
Rick makes a very good point. The Heathkit Shop has a retrofit kit (AC-4R) to
upgrade the AC-4. I ahve two AC-4s witht he kits in them and can vouch for the
high quality of the kits. The URL for the website is
http://www.theheathkitshop.com/. It looks like the owner is taking a
Evan, what thickness of the acoustic foam did you use? Is it placed directly in
back of the speaker but not touching? Is the foam available at RadioShack and
the like? Thank you.
Bob k9JU
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Brian:
Surplus Sales of Nevraska has a Collins replacement speaker that fits the MS-4
cabinet. I have replaced one of my MS-4 speakers with the unit. To me, it
sounds more mellow than the original speaker used by Drake. It has a massive
magnet.
The speaker is listed at the bottom of the
Hi, all:
I should do a better job of proofreading before pressing the Send button! The
summary of the changes should have referenced R135 (not R133) in the both cases.
I apologize if there was any confusion.
73,
Bob K9JU
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Hi, Gene (and all):
I just went through a VOX problem with one of my TR-4Cs. The VOX dropout delay
was too short for CW. After close inspection of the two units, R135 was 33k, a
value used to set the cutoff bias for the 6FQ7/6CG7 even though I had a 6EV7 in
the rig. My other TR-4C, and a TR-4,
To all who received a bogus email, including this list, my apology. My email
address list was hacked. That's the last time I will open any email in the spam
folder regardless of how legit it looks. A word to the wise is sufficient.
73,
Bob K9JU
___
Has anyone on the list ever seen the original selling price (MSRP) for the RV75
Remote VFO? None of the price lists at WB4HFN's website shows the item.
Just curious and want to compare MSRP with what ePay sellers are getting for
the very rare units.
73,
Bob K9JU
Bill, one of my 'R-4Cs had a noisy IF amplifier, V5, which is also a 6BA6 like
the RFA.
73, Bob K9JU
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Hi, Larry.
I've had problems with relays in the TR-4 series transceivers as well as a
latching relay at the base of my tower to switch between two feedlines. Any
contact that doesn't carry sufficient current (think received signals) will
over time develop a layer of corrosion. To clean the
Hi, Al:
For what it's worth, I looked at the specification sheets
for both the U310 and the J310. They are virtually identical as I
thought. The only differences were a slightly higher output capacitance
(drain to gate in grounded gate configuration) and a slightly wider
Vgs-off (like the
Hi, Al:
The U310 is the metal can version of the J310 or, should we say, the J310 is
the plastic cased version of the U310.
The J310 is dirt cheap from places like Mouser. I've used the J310 in many
circuits. They are relatively stable in the grounded gate configuration but it
is a good idea
Hi, Robb:
The Motorola HEP-C6050G is the MC1496 in the G package, the round metal can.
If for some reason you have the 14-pin DIP package, that is the MC1496L, same
device, different package.
This is one of those times I'm glad I didn't get too ambitious about tossing
old data books, etc., in
Add in SBCGLOBAL (ATT) and/or Yahoo Mail!
Bob K9JU
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Hi, Paul:
I purchased a T4-XC with MS-4 speaker and AC-4 on the cheap. The rig, etc., are
in really nice shape and the cabinets of the T4-XC and MS-4 had been repainted
beautifully.
The T4-XC had an 80-mm square dc fan on the back of the PA cage. Two screws to
mount it at the top and a tie
Hi, Jim, et.al.:
The filter is most likely the Fox Tango GUF-1. If I'm not mistaken, FT sold the
rights to their filters to Inrad which has many filters for many rigs
available.
From the part number, my educated guess would be the 6.0-kHz wide, 5645-kHz
center frequency, 8-pole crystal
Steve, et.al.:
I would reconsider using a stereo jack for the front panel hole filling
unless you are planning to keep the receiver for your use. If you are going to
sell the receiver after it is functioning correctly, the next owner may assume
the jack is a standard mono jack and plug in a
Ron, I had a problem with one of my TR-7 rigs with the 40-MHz oscillator. To
recenter the frequency to something reasonable, I changed C1006 to 39-pF (was
50-pF). Admittedly, this probably changes the feedback ratio but it did allow
adjusting L1001 to frequency within its tuning range. This was
Don't think that the MC1496 version of the 2nd IF/AF card will solve all
problems. I have two TR-7s, one with the MC1496 and the other with the diode
product detector. After some other modifications, the MC1496 IF board sounded
somewhat worse than the diode detector card. Namely, if one copies
I have a homebrewed RV-7 substitute that I just tried on 40M CW. There is no
change in the displayed frequency on the TR-7 if the RV-7 is in control. If I
use it for only TX or only for RX, the displayed frequencies are as expected
without any jumpy error.
Bob K9JU
Hi, Garey, et.al.:
Your explanation of the various crystals for the 4-line made me grab my Drake
4-line manuals and look through them. The circuits for all of the crystal
oscillators in the receivers, except the R-4, and the transmitters are
virtually, if not, identical. Those would use the
This isn't an answer to the how to remove the PTO assembly as Garey has
addressed that issue.
This could be thought of as a sidebar to the discoloration of the dial.
I have several Drake radios. My original R-4 (s/n 0065) is very modified (don't
ask) and I believe I purchased it in 1965. I
Many years ago, I used a multi-impedance spekaer from Radio Shack as a
replacement in a MS-4. It has been on the shelf for a number of years. But with
a growing number of Drake receivers in the collection, I needed a third MS-4.
So, I pulled the speaker off the shelf and was immediately
James Barrie and all:
I've used Kroil and SiliKroil in the past and it does wonders on frozen bolts,
etc. I never thought of using it on a rusty chassis but if it works as well on
a chassis as it does on bolts, it's a winner.
There is one point with purchasing any porduct from Kano Labs.
I've mentioned this before, rather recently, but check CR19 in the cathode
circuit of the driver, V4 (12BY7). I have 2 T-4XC transmitters that exhibited
sudden drop (to nothing in both cases) in power output. Both had CR19 with
cracks in the cases. The diodes would appear OK with a DMM (diode
Hunter, et.al.:
I have a T-4XC that would produce output power for a period of time and then,
suddenly, no output. If the rig was turned off and allowed to cool down, then
turnd on, the output power would again appear. Several minutes later, same
thing... no output power.
In my case, CR19 in
George, I had a similar experience with an R-4C that still had the 6EJ7 third
mixer. However, the noise was from the IF Amplifier, V5, a 6BA6. New tube in
and the intermittant solar storm noise was gone.
Bob K9JU
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Thank you to all who responded to my listing for the musty R-4C. The odor
from the receiver is definitely a musty, damp basement (or other storage
area) type of smell. I have numerous other used pieces of RL Drake equipment
and none has ever smelled like this R-4C. I presume the radio must have
Hello fellow Drake lovers.
I purchased an R-4C some months ago and it operates as expected. The addition
of a 250-Hz CW filter makes operating that mode much more enjoyable.
The only real problem I have with the receiver is a musty odor that's emitted
by the unit after being on for a while.
Halo-Net:
My old Motorola data books reference the MR1034 as a 1N4722. It is a 400 PIV/3
A rectifier. The MR1033 is 300 PIV/3 A rectifier but without a corresponding
1N47xx series sister. Unfortunately, neither Mouser nor Digi-Key have the
1N4722.
The 1N5404 is a 400 PIV/ 3 A rectifier in a
To: Max AirRadio:
In my experience with Drake receivers, the audio output stage in the tube
radios is in need of changing. The R-4C looks like a solid state adaptation of
the 6AQ5 output of the previous 4-receivers. As a CW operator, I know that
shortcomings of the audio output are really
Did the TR-3 always use a Drake design (and manufactured) twin crystal filters
unit? From what I can gather from this forum, the design was a 4-pole design.
Is that true?
The unit I have, serial number 12324A, has a filter unit manufactured by C-F
Networks of Phoenix, AZ. The terminating
Hello, all. I am new to the Drakelist but have been an owner of one or more
pieces of RL Drake equipment since 1963. My R-4 is serial number 0065 but I
redesigned and solid stated it over the course of many years.
My question pertains to a T-4XC (s/n 25745) and MS-4 (w/AC-4) that purchased at
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