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Panel Spacer for 2-B and 4-Line
Hey Everyone, I¡¯m restoring a 2-B and would like to get an update on panel spacer availability. Some time ago, 2bradioparts.com stocked spacers that he had labeled as being for 4-Line radios; I compared one these to the a spacer installed that is in good shape, and it is the same size, while the new one looks to be plastic instead of fiber, which is fine. Does anyone know a source for these spacers nowadays? The new uncompressed thickness is 2.6 mm. See photo. Thank you, Michael Smith, N4KZO
Started by Michael Smith @
TR3/4 Meters 11
I'm working on a TR-3 with the dreaded "bouncy meter". I have one plate amperes meter. These can't be swapped because they're mirror image of each other but noticed that the deflection is different in each. Does anyone know what these meters are calibrated to (i.e., what is FS current for each)? Also, if anyone has a spare S meter, please let me know if you're interested in selling it. 73, Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent with Proton Mail secure email.
Started by Steve Wedge, W1ES/4 @ · Most recent @
Filament fuse blew 6
I was trying to re-seat the LSB bulb to the chassis because the bulb was intermittent. In doing so I think the positive side of the bulb housing touched ground some how because when I turned the TR-4CW back on and the amp meter light, frequency light, LSB, and USB lights were not lit. Then the filament fuse blew! I replaced the wire with #26 AWG and pulled both LSB and USB out and re-seated them and made sure nothing was shorting to ground. I quickly turned on the rig but still those lights would not light. The only light that I get is the round red light on the right side of the frequency read out. I connected my power supply to my other TR-4CW and that rig works OK so the power supply is still good. Not sure what is going on? Mark
Started by Mark N2DMI @ · Most recent @
Drake 1A Receiver 8
I have a 1A, Serial #331, an early one, and another later one with WWV. I didn't realize that the original version did not have a crystal calibrator (I knew it didnt have WWV) until I opened them both up for recapping. The "newer" one also has a couple of sub boards, the original does not, though the components seem to be there. I don't have and cannot find the manual or a schematic for the older unit, just for the newer one from BAMA. My question is does anyone know what the WWV mod, (which could be performed by Drake) consisted of? I assume it was not a difficult mod, and that the bandswitch has another contact for WWV. I have replaced the tuning dial with another I had, which has the WWV marking. Was thinking of adding the calibrator and WWV mod, but since no schematic of original old version its not obvious what was added. I have a third unit Which works but missing knobs and face place, its a shame to use it as spare parts. Thanks, Ed W1FU
Started by Edward w1fu @ · Most recent @
Drake 1A receiver Speaker 4
i have seen pictures of a matching speaker for the 1A in advertising, but have never actually heard of one. Did they actually produce it? It looked like it used (or would use) the same 1A cabinet. Was thinking of making one as I have another cabinet, but did they actually exist? I use a 2A speaker, which looks good. Thanks, Ed W1FU
Started by Edward w1fu @ · Most recent @
For sale: Drake L4B and power supply. Very good condition. Eimac 3-500 tubes. 1200 watts output with 100 watts drive. $1,000 shipping extra. 3
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Started by Rich W3RJ @ · Most recent @
For sale: Drake L4B and power supply
For sale: Drake L4B and power supply. Very good condition. Eimac 3-500 tubes. 1200 watts output with 100 watts drive. $1,000 shipping extra. W3RJ -- This email has been checked for viruses by Avast antivirus software. www.avast.com
Started by Rich W3RJ @
Drake SPR-4 50 Khz IF and 50 Khz Filter alignment 3
I am trying to make a full alignment to a Drake SPR-4 but I have come across with an issue in the first step that the procedure manual indicates, any guidance would be greatly appreciated. According to the point 5.3.1. I have connected a VTVM and the signal generato where indicated, I can adjust T17 for zero beat but when adjusting T15 and T16 for maximum deflection there is no a slight movement neither in the voltmeter nor in the S-meter. Due to the high impedance of the circuit , could be causing this the FET and IC located in the S-meter PCB? I have seen modifications that recommend to replace them: http://www.zerobeat.net/drakelist/drakemod/drmod101.html Anyone has had this problem before? Or could be caused by other elements.
Started by enriqueeeeee2001 @ · Most recent @
6JB6A 9
Gentleman: For a TR-4C, is there any difference between 6JB6A brands? I'm buying 3 of them and there's some well known brands available such as Sylvania, GE and RCA. RCA a bit cheaper. All NIB/NOS. Any recommendations? 73 Marcus PY2PLL + PY3CRX GG66rf
Started by Marcus PY2PLL @ · Most recent @
Current meter does not move when setting load during tune up. 2
When tuning up my second TR-4CW the current meter goes to 0 when I push in the load control to tune it. I can see the load control working on my external power meter just nicely. I figured it was the switch. I measured all 3 terminals on this switch compared to my other TR-4CW (that doesn't have this issue) and my ohm measurements are pretty close so I believe the switch is OK. Not sure what to do next? Mark
Started by Mark N2DMI @ · Most recent @
WRL- Galaxy IO Group
There is an IO group devoted to Leo Myerson's equipment. Leo made a huge impact on amateur radio. If you have an interest, please join us at: /g/WRL-Galaxy-Radios Tnx, Dale W4OP
Started by Dale Parfitt @
TR-4 AM Mode 18
On my TR-4, when I switch to AM mode I get no audio output at all. Can someone please suggest a way to troubleshoot this? I thought that if I touched the grid of the last audio amplifier with a screwdriver, I'd get a pretty loud buzz, etc., from the speaker but I don't get anything with that little test (crude, yes, but I was trying to see where the signal stopped). I presume injecting a modulated CW signal back through the chain should eventually find where it stops but not sure about that. Any hints are welcome. Thanks, Barry - N4BUQ
Started by n4buq @ · Most recent @
Drake C Line For Sale 3
Hello all, I am selling one of my Drake C Lines: R-4C, T-4XC with manual AC4, MS-4 and fresh cables. All stock, very good condition, and regularly on the air. For the time being, pickup only in Arlington, VA. $550. tks, Burt W3IO
Started by Burt W3IO @ · Most recent @
File /RCA_CA3053.pdf uploaded #file-notice
The following items have been added to the Files area of the [email protected] group. /RCA_CA3053.pdf By: Jim Shorney <jimNU0C@...> Description: RCA CA3053 differential amp IC data sheet
Started by Group Notification @
Thinning the shack Drake TR2770 transceiver for sale
The other night I was in the shack, and looked around at all the stuff I've gathered together over the years. It's time to let some of this stuff go. So, I've decided to sell my Drake TR2770. This is a rather rare two meter rig with a UHF receiver. Yeah, marketing really missed the mark with this product. It's been so long since I used it, but I'm thinking it does multimode, too. I set it up to talk on the local repeater. Anyway... comes with the manual, power cord but no microphone. I rarely call something mint, but damn, this is about a close as mint as you can get. I'm asking $375 plus shipping Contact me off the list if interested.. at: prosolar@... I'm Mike, WB8VGE
Started by mike bryce @
The Drake 2B and its Frequency Spread Limitations 37
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...
Started by Richard W2ONE @ · Most recent @
TR-4 - V2 Pin 1 Resistance 4
I'm looking at the resistance values on V2, Pin 1 and something doesn't make sense to me. With a key inserted and the key up, I'm getting about 5.7M. With the key down, I get about 3.3M. The key-down value makes sense because R131 and R130 are series grounded at the key. The key-up value, though, doesn't make sense because, as I see it, there is no path to ground. Thinking the tube might have an internal short, I tried the measurements without the tube in place with no differences in the readings. I also pulled V4 and V6 as those are the only other two tubes that I can see that could be a ground path but still no change. Am I missing something? I just can't see how that pin is grounded and am wondering if I might have a wiring problem. Thanks, Barry - N4BUQ
Started by n4buq @ · Most recent @
TR4310 vs TR-7 RIT circuits
Not sure how different the RIT circuits are for the TR4310 versus the TR-7 but they are different. For example, with the 4310 using RIT, when the PTO dial is moved the RIT is automatically turned off; this is not the case with the TR-7 and RV75 where the RIT stays activated until manually turned off. 73, Evan, K9SQG On Saturday, April 12, 2025 at 01:26:24 AM EDT, Jim Shorney via groups.io <jimnu0c@...> wrote: If the RIT circuit is the same as the TR7 that shouldn't happen. The switch is DPDT and one half fires the lamp when pushed in. The other half applies +10 to either the RIT or /RIT control signal on the PBT/REF board. That's it. The rest is simple analog voltage steering through a 4016 analog switch IC. No digital involved. OTOH if they did something different involving the synthesized VRTO then all bets are off. It may be a feature or a bug.... On Fri, 11 Apr 2025 08:42:48 -0700 "VE7PS via groups.io" <ve7ps@...> wrote: > Tilman...congrats on the TR-4310. > > Mine also has the "RIT ON at startup" issue, and I believe others do too. > I gave up trying to find why, but then I am not a digital guy at all, > Maybe Mark can set us straight on this one? > > Every few years I need to pull it out and clean all the Molex connectors, > same as the TR-7's. So far that process has solved any other problems that > have cropped up. > > 73 > Peter > VE7PS -- 73 -Jim NU0C
Started by Evan @
Drake 2B Instruction Book 17
I found the Drake 2B Instruction Book on line, but it is a digital copy made after several generations of machine copies - it is not very clear in some places. A couple of the pages are also out of order. I have found a different digital version that is cleaner and has a few additional pages of information. Interestingly, this other version also has a slightly different description of the crystals and how to use them - probably a version made that was before or after the version now on line. I am attaching this cleaner version here to share. Richard W2ONE
Started by Richard W2ONE @ · Most recent @
Strain Relief for AC-4
Rather than spending time trying to reinvent the wheel, have any of you installed 16 AWG SJT power cords into an AC-4 using the correct strain relief? I understand that this will involve enlarging the hole in the AC-4 but I'm done with Dremeling strain reliefs to get them to work with round cables. Too much time and I have a few AC-4's that need at least an updated AC cord. Yes, 16 AWG is smaller than factory 14AWG 2-conductor but a 5A continuous load is fine with a 16 AWG cord. It's more important, at this point, to have a safety ground for the power supply. What size relief and what size hole? 73, Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent with Proton Mail secure email.
Started by Steve Wedge, W1ES/4 @
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