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Re: TR-4 - Soft Finals?
¿ªÔÆÌåÓý"Soft" referring to a tube means gassy.? There are many symptoms of gas but a change in characteristics as the tube heads is one of them. Very gassy tubes can have a glow inside something like the glow in a voltage regulator tube ? However, tubes running at high voltage can have a slight glow without gas, and the glow on the inside surface of the glass envelope from high voltage is due to electron bombardment and is normal. -------- Original message -------- From: n4buq <n4buq@...> Date: 5/17/25 8:44 PM (GMT-08:00) To: DRAKE-RADIO <[email protected]> Subject: Re: [DRAKE-RADIO] TR-4 - Soft Finals? The cathode resistors are new 15R, 1%, 1W. Barry - N4BUQ > Can someone please tell me what is meant by the term "soft finals"?? I'm still > having problems getting proper output from my TR-4 and, for all I know, that > might be the problem.? I've tested them for transconductance and all three are > very close to the same value and, furthermore, that value is quite a bit above > the minimum for a good tube. > > Aside from low output (i.e. about 300 mA plate current maximum into a dummy > load), I notice that if I hold down the key for a few seconds the plate current > tends to drop just slightly and I think if I were to continue holding the key > down, the current would continue to slowly decrease. > > I measured the voltage across each cathode resistor and I notice the same > phenomenon: the voltage climbs to about 1.6 VDC and then begins to drop a bit. > Like the transconductance values, each cathode resistor is "matched" in value > and behavior to the other two so I suppose that's one good thing. > > Am I seeing the result of weak/soft tubes or is something else going on that > would cause this? > > Thanks, > Barry - N4BUQ > > > |
Re: TR-4 - Soft Finals?
What I meant to write was: Like the transconductance values, the voltage across each cathode resistor is "matched" in value and behavior to the other two so I suppose that's one good thing.
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The cathode resistors are new 15R, 1%, 1W. Barry - N4BUQ Can someone please tell me what is meant by the term "soft finals"? I'm still |
Re: The Drake 2B and its Frequency Spread Limitations
Ha!? Dave,
?
I suspect you are correct!? I probably do not need to be concerned about letting so much of the HF frequencies escape my grasp - nothing there anymore, anyway.? OK, well if I can figure out where to concentrate my listening pleasure (the commercial and public and private broadcasts of music and news), then I will start a search for the crystals to get that job done and stop crying about not getting the remainder of the frequencies.
?
Richard
W2ONE
? |
TR-4 - Soft Finals?
Can someone please tell me what is meant by the term "soft finals"? I'm still having problems getting proper output from my TR-4 and, for all I know, that might be the problem. I've tested them for transconductance and all three are very close to the same value and, furthermore, that value is quite a bit above the minimum for a good tube.
Aside from low output (i.e. about 300 mA plate current maximum into a dummy load), I notice that if I hold down the key for a few seconds the plate current tends to drop just slightly and I think if I were to continue holding the key down, the current would continue to slowly decrease. I measured the voltage across each cathode resistor and I notice the same phenomenon: the voltage climbs to about 1.6 VDC and then begins to drop a bit. Like the transconductance values, each cathode resistor is "matched" in value and behavior to the other two so I suppose that's one good thing. Am I seeing the result of weak/soft tubes or is something else going on that would cause this? Thanks, Barry - N4BUQ |
Re: The Drake 2B and its Frequency Spread Limitations
Richard, you are correct, the 2B (or any ham band-only Drake) is not a general coverage receiver in the current sense of Japanese radios. While it can be made to receive almost all segments of the 2-30 MHz shortwave frequencies, performance will suffer somewhat as you move away from the 5 major ham bands.
?
But you need not be concerned too much about the 6 MHz total coverage available in the radio, since the 2-30 MHz frequency range is mostly empty space these days. Focus on the ham bands and SW broadcast bands you want to listen to, and try to find crystals to cover the ranges you care about. It won't be an easy task these days as few crystal makers are still around.
?
What I did was to buy one of the little Chinese VFO units (around $40 in pre-tariff days on eBay or Amazon), and made a cable with the base of an old HC-6/U crystal that I sacrificed. You can plug that cable into one of the crystal sockets of the 2B to use in place of one of the expensive crystals. Put the VFO into TX mode and do the math to determine the HFO frequency you need for your band of interest. It works pretty well, actually. Maybe not as good as the S-40B, but it works.
?
Dave |
Re: The Drake 2B and its Frequency Spread Limitations
Yes, we've all been there!
On Saturday, May 17, 2025 at 09:39:22 PM EDT, Ralph AD9FM via groups.io <a2r4ever@...> wrote:
Brother I understand the feeling I did the same because I wanted the radio I learned on in1973 but when I bought it and unboxed it, I felt I was reading Chinese. My dad taught me a lot but about the drake he taught me very little, so I too had to embarrass
myself in this forum and ask a simple "how do I solder my microphone for it to work on my drake" question. Don't feel bad these folks are great people and fully understand you
Ralph AD9FM
Sent from my T-Mobile 5G Device Get From: [email protected] <[email protected]> on behalf of Richard W2ONE via groups.io <cowboyhat@...>
Sent: Saturday, May 17, 2025 9:23:19 PM To: [email protected] <[email protected]> Subject: [DRAKE-RADIO] The Drake 2B and its Frequency Spread Limitations ?
Hello everyone.? I am new here.? Let me know if I become too much of a pain ...
?
I just received a Drake 2B from an eBay seller.? I will admit to a lot of stupidity on my part and a lack of understanding before I pushed the "Purchase now" button.? I purchased this during an emotional stupor because I was looking for a GOOD old tube
SW receiver like my Dad used when I was in elementary school in the 60s - a Hallicrafters S-40B.? Mom and Dad were scrimping by with just barely enough money and my Dad picked-up that Hallicrafters from a junk yard and got it working again.? Even though Dad
had to walk a mile to work and back because he did not have a car, he gave some priority to buying that Hallicrafters.? And we had a great time listening to stations all over North and South America late into the night (usually ending only when Mom came into
the room with her hands on her hips).? I remember the glow on the ceiling and the smell of those hot tubes.? So, after reading a lot of reviews which all kept focusing on the Drake 2B as THE radio to have, I pushed that eBay button and have been waiting where
my driveway meets the street ever since.? It showed up yesterday and I unboxed it and started reading the manual.? Boy, am I ever lost!? I am not normally a stupid fellow and I can usually get my brain to cooperate on new and even difficult concepts, but that
manual and me have decided to part company.? Surely, there is a better source of information somewhere on how to work this radio!? I have more questions than I believe this group will allow, but let me start with this one:
?
If I understand the manual correctly, and a little simple math, if I purchase ten crystals and fill each of the ten slots, that will give me a total band spread of frequencies of (let's see: a 600 kHz spread per crystal, times ten crystals, equals 6,000
kHz of total frequencies) available on this radio.? Of the frequencies usually collectively available on the LW, MW, and SW bands on most of these old vintage radios (specifically, .5 to 30 MHz), this radio will not tune to the LW or MW groups and will let
me listen to only 6 MHz (6 MHz!) of the SW group.? Is that REALLY true?? Surely a coveted radio with owners' comments centering around "I will never give it up" to "I should not have given it up" can do better than that!? Is this true, or will someone here
tell me where the secret button is that will allow me to tune in the remainder of the HF field?? Really, I think I goofed and bought a specialized radio that was never intended to be in the hands of a "general receiver" fool.
?
Richard
W2ONE
?
By the way, ever since I unboxed the radio and started sighing heavily with each page turned in that manual, my wife has started standing at the door with her hands on her hips...
?
|
Re: The Drake 2B and its Frequency Spread Limitations
¿ªÔÆÌåÓý
Brother I understand the feeling I did the same because I wanted the radio I learned on in1973 but when I bought it and unboxed it, I felt I was reading Chinese. My dad taught me a lot but about the drake he taught me very little, so I too had to embarrass
myself in this forum and ask a simple "how do I solder my microphone for it to work on my drake" question. Don't feel bad these folks are great people and fully understand you
Ralph AD9FM
Sent from my T-Mobile 5G Device Get From: [email protected] <[email protected]> on behalf of Richard W2ONE via groups.io <cowboyhat@...>
Sent: Saturday, May 17, 2025 9:23:19 PM To: [email protected] <[email protected]> Subject: [DRAKE-RADIO] The Drake 2B and its Frequency Spread Limitations ?
Hello everyone.? I am new here.? Let me know if I become too much of a pain ...
?
I just received a Drake 2B from an eBay seller.? I will admit to a lot of stupidity on my part and a lack of understanding before I pushed the "Purchase now" button.? I purchased this during an emotional stupor because I was looking for a GOOD old tube
SW receiver like my Dad used when I was in elementary school in the 60s - a Hallicrafters S-40B.? Mom and Dad were scrimping by with just barely enough money and my Dad picked-up that Hallicrafters from a junk yard and got it working again.? Even though Dad
had to walk a mile to work and back because he did not have a car, he gave some priority to buying that Hallicrafters.? And we had a great time listening to stations all over North and South America late into the night (usually ending only when Mom came into
the room with her hands on her hips).? I remember the glow on the ceiling and the smell of those hot tubes.? So, after reading a lot of reviews which all kept focusing on the Drake 2B as THE radio to have, I pushed that eBay button and have been waiting where
my driveway meets the street ever since.? It showed up yesterday and I unboxed it and started reading the manual.? Boy, am I ever lost!? I am not normally a stupid fellow and I can usually get my brain to cooperate on new and even difficult concepts, but that
manual and me have decided to part company.? Surely, there is a better source of information somewhere on how to work this radio!? I have more questions than I believe this group will allow, but let me start with this one:
?
If I understand the manual correctly, and a little simple math, if I purchase ten crystals and fill each of the ten slots, that will give me a total band spread of frequencies of (let's see: a 600 kHz spread per crystal, times ten crystals, equals 6,000
kHz of total frequencies) available on this radio.? Of the frequencies usually collectively available on the LW, MW, and SW bands on most of these old vintage radios (specifically, .5 to 30 MHz), this radio will not tune to the LW or MW groups and will let
me listen to only 6 MHz (6 MHz!) of the SW group.? Is that REALLY true?? Surely a coveted radio with owners' comments centering around "I will never give it up" to "I should not have given it up" can do better than that!? Is this true, or will someone here
tell me where the secret button is that will allow me to tune in the remainder of the HF field?? Really, I think I goofed and bought a specialized radio that was never intended to be in the hands of a "general receiver" fool.
?
Richard
W2ONE
?
By the way, ever since I unboxed the radio and started sighing heavily with each page turned in that manual, my wife has started standing at the door with her hands on her hips...
?
|
The Drake 2B and its Frequency Spread Limitations
Hello everyone.? I am new here.? Let me know if I become too much of a pain ...
?
I just received a Drake 2B from an eBay seller.? I will admit to a lot of stupidity on my part and a lack of understanding before I pushed the "Purchase now" button.? I purchased this during an emotional stupor because I was looking for a GOOD old tube SW receiver like my Dad used when I was in elementary school in the 60s - a Hallicrafters S-40B.? Mom and Dad were scrimping by with just barely enough money and my Dad picked-up that Hallicrafters from a junk yard and got it working again.? Even though Dad had to walk a mile to work and back because he did not have a car, he gave some priority to buying that Hallicrafters.? And we had a great time listening to stations all over North and South America late into the night (usually ending only when Mom came into the room with her hands on her hips).? I remember the glow on the ceiling and the smell of those hot tubes.? So, after reading a lot of reviews which all kept focusing on the Drake 2B as THE radio to have, I pushed that eBay button and have been waiting where my driveway meets the street ever since.? It showed up yesterday and I unboxed it and started reading the manual.? Boy, am I ever lost!? I am not normally a stupid fellow and I can usually get my brain to cooperate on new and even difficult concepts, but that manual and me have decided to part company.? Surely, there is a better source of information somewhere on how to work this radio!? I have more questions than I believe this group will allow, but let me start with this one:
?
If I understand the manual correctly, and a little simple math, if I purchase ten crystals and fill each of the ten slots, that will give me a total band spread of frequencies of (let's see: a 600 kHz spread per crystal, times ten crystals, equals 6,000 kHz of total frequencies) available on this radio.? Of the frequencies usually collectively available on the LW, MW, and SW bands on most of these old vintage radios (specifically, .5 to 30 MHz), this radio will not tune to the LW or MW groups and will let me listen to only 6 MHz (6 MHz!) of the SW group.? Is that REALLY true?? Surely a coveted radio with owners' comments centering around "I will never give it up" to "I should not have given it up" can do better than that!? Is this true, or will someone here tell me where the secret button is that will allow me to tune in the remainder of the HF field?? Really, I think I goofed and bought a specialized radio that was never intended to be in the hands of a "general receiver" fool.
?
Richard
W2ONE
?
By the way, ever since I unboxed the radio and started sighing heavily with each page turned in that manual, my wife has started standing at the door with her hands on her hips...
? |
Re: Drake 7077 wiring
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From: [email protected] <[email protected]> on behalf of Evan via groups.io <k9sqg@...>
Sent: Saturday, May 17, 2025 5:18:37 PM To: [email protected] <[email protected]> Subject: Re: [DRAKE-RADIO] Drake 7077 wiring ?
Original Drake mic plugs were 0.21 inches in diameter, not 1/4" which was used for keys or speakers.
On Saturday, May 17, 2025 at 11:32:40 AM EDT, Greg W9GB via groups.io <w9gb@...> wrote:
[Edited Message Follows] Your 1/4 inch Phone Connector (Plug) is 3-conductor (stereo).
The engravings show the screw terminal assignments.
?
T : Tip (PTT)
R : Ring (Audio, Mic element)
S : Sleeve (Grounds, Audio and PTT)
?
Page 2-1 in your Drake TR4C Manual has Pictorial proper wiring for any Microphone.
http://hammadeparts.jivetones.com/Amateur_Radio_Manuals_Schematics/DRAKE/TR4C.pdf
===
The Drake 7077 (Astatic OEM of 878HL-2) microphone has 3-conductors and Shield.
https://www.cadaudio.com/products/astatic-commercial/878hl-2
Standard Microphone usage: ?Audio uses 2 wires and Push-to-Talk (PTT) uses 2 wires.
¡ª-
SO, for wiring to your Drake Radio (3-wires) you have to Combine Ground connections.
?
|
Re: "I THE cantenna unveiled!
I have several Cantennas that followed me home over the years. I have discovered a certain size of plastic cake box lid that works well as a drip tray. My local grocery store was selling cookies in them for a while. Not saying how many I have... :D The oil does not seem to eat through them and because they are clear plastic you can easily see if your can is leaking and how much.
On Sat, 17 May 2025 22:11:51 +0000 (UTC) "Ralph Mowery via groups.io" <ku4pt@...> wrote: I do have it in an old cooking pot to catch the seepage that sometimes comes out of the vent . -- 73 -Jim NU0C |
Re: "I Never Should Have Gotten Rid Of......
I built several smaller kits, then the HW-101 when I was in my Freshman year of college (and should have been studying Calculus). Man that thing tuned smoothly. I made the mistake of selling it sometime later to get some cash to "upgrade" to a Kenwood TS140S.??? I've got other HW101's now, but I don't have THAT Hw-101!On Sat, May 17, 2025 at 6:53?PM Joe - W7RKN via <w7rkn.7=[email protected]> wrote:
|
Re: "I Never Should Have Gotten Rid Of......
¿ªÔÆÌåÓýHmmmm..seems an important line was inadvertently omitted!? ¡°¡.Warrior amp.? Then I built the SB-102 and all the scopes and the hybrid phone patch¡..¡±? (Remember what those were?!!!) ? Joe ¨C W7RKN From: [email protected] [mailto:[email protected]] On Behalf Of Joe - W7RKN via groups.io
Sent: Saturday, May 17, 2025 1:36 PM To: [email protected] Subject: Re: [DRAKE-RADIO]"I Never Should Have Gotten Rid Of...... ? In the 70¡¯s, I built my entire station¡Heathkit.? First it was? the HW-101, the HA-10 Warrior amp.? Warrior was just too big and didn¡¯t match the 102, so I built the SB-200.? Not done yet¡.wanted more power, so You guessed it, the SB-220 was next.? Had to have the Cantenna, so it was added to my kit building!? Welp, no AM in the 102, so the SB301/401 was next.? (The world of split frequency operations was soon discovered and quickly loved that capability! ? Outside of the ham equipment, I built lots of Heath kits¡.Color ³Ù±¹¡¯²õ, multi meters, O-scopes, automobile scopes and tuners, weather station, digi clocks¡Don¡¯t remember all else, but there was a lot of stuff,? I loved building. ? I still have some of the Heath stuff, but with the exception of my cantenna, all the Heath amateur? gear is gone.? L ? The automobile scope still works but no longer really needed with today¡¯s cars.? I still have my weather station and digi clocks as well my multimeters (VOMs and VTOMs) ? Yeah..hindsight is a bear¡. ? Wish I still had all that ham stuff. They worked beautifully! |
Re: "I THE cantenna unveiled!
The PCBs in the transformer is no really much of a hazard to people on the skin.? Main hazard is that it does not break down and can get into the food chain.? I have one that is? over 55 years old I built and got some power company transformer to put in it.? I do have it in an old cooking pot to catch the seepage that sometimes comes out of the vent . Not sure if it is still made but MFJ made one similar to it. Well MFJ is sort of going out of business so may not be stocked now. I did build a Heathkit wattmeter, VTVM, signal generator, and frequency counter about 50 years ago.? Got on the old tube gear kick about 10 years ago and have a sb101,hw101,sb301,sb301,sb400,and sb200 amp.Did not build them but did have to do some work on most of them .? Mainly clean out the old lube and replace it in the LMO capacitor. Ralph ku4pt
On Saturday, May 17, 2025 at 05:58:59 PM EDT, jerry-KF6VB <jerry@...> wrote:
One complication with Cantennas:? Used/hamfest ones may contain transformer oil with dangerous PCBs. ? I have one that I drained - took the fluid to the local hazardous waste disposal - cleaned severely and filled with mineral oil. ? It tends to seep out the top.? So I put it in a big bucket with a hole in the top for the coax. ? ? ? ? ? ? ? ? - Jerry, KF6VB |
Re: "I THE cantenna unveiled!
One complication with Cantennas: Used/hamfest ones may contain
transformer oil with dangerous PCBs. I have one that I drained - took the fluid to the local hazardous waste disposal - cleaned severely and filled with mineral oil. It tends to seep out the top. So I put it in a big bucket with a hole in the top for the coax. - Jerry, KF6VB |
Re: "I THE cantenna unveiled!
¿ªÔÆÌåÓýNice history and notes¡ ? STAY SAFE AND STAY WELL! ? Respectfully, NJ DOH Licensed EMT;? PHTLS, AMLS, PHPEC Millenium EMS ARC N.E. BioMedical Services ARC N.E. Disaster Cycle Services
? From: [email protected] <[email protected]> On Behalf Of Craig W8CS via groups.io
Sent: Saturday, May 17, 2025 5:36 PM To: [email protected] Subject: Re: [DRAKE-RADIO]"I Never Should Have Gotten Rid Of...... ? Cantenna resistor was some carbon film unit to reduce inductance that a wire-wound would induce. Only old gear regret of mine was misplacing a Martin Flash key bug during one of many moves in the 90's. ?
Craig/W8CS Greenville, SC |
Re: Drake 7077 wiring
On 2025-05-17 14:18, Evan via groups.io wrote:
Original Drake mic plugs were 0.21 inches in diameter,*** AKA 3/16 inch. Common on the rigs of the day. Also airplanes to the present. PJ-068 or PL-068. - Jerry, KF6VB not 1/4" which was used for keys or speakers. On Saturday, May 17, 2025 at 11:32:40 AM EDT, Greg W9GB via groups.io |
Re: "I Never Should Have Gotten Rid Of......
Cantenna resistor was some carbon film unit to reduce inductance that a wire-wound would induce. Only old gear regret of mine was misplacing a Martin Flash key bug during one of many moves in the 90's.
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-- Craig/W8CS
Greenville, SC |