807 tube transmitter schematic This started out as a blank sheet of paper and a goal. Original Schematic as delivered. Many amateur radio operators used the 6L6 in class C service for transmitters over the years because it was inexpensive due to mass production, and it could be salvaged from scrapped TV or audio equipment. From Popular Mechanics 1958. 0: 6146: 167: The two-tube circuit used a 6AQ5 as a Pierce crystal oscillator, with a 1625 serving as class-C final amplifier. at an input of 100-130 watts. ;) As of V4. The circuit is fairly straight forward for a transmitter but there are some noteworthy features. I guess lot many hams, now-a-days, are not at all aware ofsomething called vacuum tubes &hence there would be no takers for such a recipe. Although it was possible to design and build a simpler transmitter, the goals of output power and stability could become mutually exclusive when trying I have a 807 vacuum tube and I want to make a CW RF amplifier with it. FWIW I do not like to have a top cap tube on an amplifier with exposed tubes - lethal voltages there. series see: https://en. The 1625 is the 12 volt version of the venerable 807 tube, and according to the article, it was possible to buy several of the on the surplus market for the price of one 807. Bring back the nostalgia and build your own low power AM tube shortwave transmitter! Circuit diagrams from simple to complex. Below is a schematic of the transmitter as designed by members on ARF. For those interested, here is the schematic. However, since the 2E26 was released at least 4 years before the 6146, perhaps the 2E26 should be referred to as an "older brother" of the 6146. This 150-watt transmitter has a number of attractive features. (Note that the 807 and 6J7 can be used - just don't use the voltage doubler for the filament supply. I’ve already made contacts with stations across the United States and Canada. TIP! Tested to comply with Ofcom 807B Beer Beam Power Tube. It still beats the 6146 in popularity, given the time it was used. 0: 6146: 167: Also worthwhile taking care with 807 transmitters - so suggest soldering grid and screen stoppers directly to 807 socket and with minimal resistor lead length - not something that is easy to simulate ;-) Preferably ground each speaker output winding. Find a 6L6 (not 6L6GC, the 35 watt version but the lower ~~ 25 watt ones) schematic and you'll be fine. The schematic is a well known diagram and many people have built There are links to the calculator in the References section below. For class C telegraphy operation at 80 MHz, plate voltage and input should be reduced to 80 % of maximum ratings and beer increased by 15% 3-Tube Transmitter: Schematic only. The transmitter produces an output power of 25 W on a 50 ohm dummy load. W1FTX, did in his 6AG7–807 "A Beginner's CW Transmitter" The 807 was the most-used amplifier tube in history. The transmitter output is adjustable from zero to twenty five watts output with 100% modulation. Bandswitching was considered -- and rejected. center tapped transformer, would make a pretty good 700V / 350V transmitter supply for 6146's, 807's, and similar tubes. das81. The 2E26 is a beam power tube like the 6L6, 807, and 6146. The schematic is easy and use the tubes EL84, EL34 and two 807 tubes. 807 tube transmitter Here is the design for a compact self-contained linear amplifier that shows considerable ingenuity. 70W AM Transmitter. Modulator Schematic. I've progressively detailed my efforts to build a high quality tube-type AM transmitter, starting with a one tube transmitter. It is sometimes referred to as a "baby" 6146. Joined Jan 4, 2017 18. Application. The 807 is a beam tetrode vacuum tube, widely used in audio-and radio-frequency power amplifier applications. Fifty years ago, the March 1967 issue of Electronics Illustrated carried the plans for this simple 40 meter CW transmitter. T. It's single 807 does a fine job putting out about 25 watts or so. Operating. ashok. notably the use of a pair as modulator tubes in the Heathkit DX-100 amateur transmitter. Just use a search engine with the term 807 transmitter and you will get a lot of ideas. Rows of 807's were the mainstay of transmitters and modulators during and after WW2 and were common in PA amplifiers. Ashutosh, VU21F suggested publication of information on my vintage valve type amplifier for NR60, I was hesitant. Apr 19, 2021 #3 A specifically designed "kinkless" audio tube such as the KT66 or KT88 would be a better choice in this application of course as would a greater HT voltage. Introduction: Bring back the nostalgia with this one tube transmitter. The only semi-modern feature would be a pi-network as the PA tank circuit (see schematic). In Spanish. Antique Radio AB4YD's 807 Tube Transmitter You Can(site) - AB4EL's Klunky Schematic Drawing (site) - K9GDT. Do a little googling to find the best sounding versions. Sibley Dimensions (WHD) incl. Previous Home Next . I can say that I’m well on my way to the “around the world” part. I built this based on K5DH's 807 CW Transmitter. Check Google, check the ARRL Handbook, CB websites and pirate radio The big classic using the 807's was the 1954 Standel 25L15 guitar amp using 807's, and it supposed to sound sweet almost hi-fi in quality, but in all my web search travels it's been one of the best kept secrets, and no one has really let loose a good schematic on it. Do not use the common 2J type The target audience is collectors of old tube radios who would like a small but high fidelity tube transmitter through which to feed their CD collection, etc. General Arrangement. ) uses This is a schematic of Bob's homebrew QRP transmitter. Just be aware of the base size on these are wider than most 807 6L6 types. HANDCRAFTED QRP AM TUBE SHORTWAVE TRANSMITTERS! Multiband 9. Remember an isolation transformer. 0: 12AX7, 50C5 (2) 18: AM Modulator 6DQ6B (2), 807 (2) 25 "Cadillac" 250W AM Transmitter: Rack-mounted, high-end Am transmitter. Current Design. One thing that needs clarification is the oft stated notion that the 1624 is a "DH" 807. There are plenty of good designs out there showing different audio The tube line-up for the RF section Circuits are strictly conven- 807 tube. Operating convenience with medium power. May be used with full input up to 60 MHz. 3 This circuit continued in subsequent editions of the Handbook with a 6L6 replacing the 807. extrapolated from the 1956 GE five-star and special purpose tube types manual, which lists the 807 operating at low The transmitter described herewith can be operated on any band from 7 to 28 Mcs. From audiophile tube amps, to RF modulators to RF linears and class-C self excited power oscillators, the 807 was/is there :-) RF schematics are all over. This design is proven by experiment. VK2DX (Sydney This 150-watt transmitter has a number of attractive features. A quick look at the The Heathkit AT-1 represents the commercial embodiment of the simple Master Oscillator Power Amplifier (MOPA) transmitter using a crystal controlled 6AG7 oscillator plus a 6L6 final output tube. Of course the Williamson . The rectifier tube has two plates, so it is wired as a full wave rectifier. Larger projects like the 3 band MOPA transmitter and the 5 watt 807 audio amplifier can only be powered from this larger PSU. 3 V, 1. There's another 807 that's a little more under the radar - 5933 it's a ruggedized version of the 807, this is the tube I've been using lately. It's CW on 80 meters, about 1 watt output, VFO and only uses TWO rf transistors and one more for keying. 4K to 9. It was actually designed for a military transmitter that used 807's as the modulator tubes. EL91, ECC83, 807 (2) 65: Three Tube Transmitter: From Frank Harris, Chapter 14. N. Provision is made for either crystal or VFO frequency control and a power pack giving 750 volts, with tappings at 350 volts and 250 volts, is sufficient to run the transmitter at full power. for the multiplier stages and the padder capacitors, C6, C8, C10 and C12, Another Russian tube seen is branded Philips. A. Williamson designed a circuit for a high-fidelity audio amplifier[pdf] initially I believe for the KT66 but very quickly a version followed which used the 807 tube. I have always wondered how safe it is to operate an 807 in a Most likely the PEAK screen voltage is near the 300 volts you expect. wikipedia. I am thinking of using transistors in pre amplifier and 807 as final power amp. 0: 41(2),6L6: 66: 90 Watt CW Rig: 2-Tube Transmitter for 80 meters: No schematic, but I believe you can figure it all out from the close-up photos of the parts: x: 15. . 3, this thing puts out 55 watts carrier, PLL controlled! (That's up from 12 watts w/analog VFO, when I started this whole kooky project. I shows a block diagram of the circuit arrangement. The 807, a beam tetrode popular among ham radio and broadcast (RF transmitter) use, was heavily purchased and used within the military, and the famed D. 4 Cir-cuits like this were also 1967 One Tube CW Transmitter. At that meeting I got a The Improved 1-Tube AM Transmitter. Schematic of W3WXP's 150-watt bandswitching transmitter. The One Tube Transmitter. The The modulation transformer will provide between 8. It is extentionally covered on page 76 of "Tube Lore " II by Lud. The VFO and multiplier stages are gang-tuned, and a multiband Here is the circuit diagram with values marked: The transistorized linear driver is expected to swing up to 60 to 70 mA with signal (AF) input. If you run about 15 watts the positive peaks will be somewhere around 115% while the negative peaks remain below 100%. Fig. Build a transmitter from scratch that could be used to talk around the world with. They are arguably one of the best multi purpose valves ever made. The transistor has to be biased at 20 mA &must be heat-sinked properly. For about $50 on up the 3-4 tube transmitters are available today on the internet or at ham swaps. The tube-based adjustable regulator is based on one in the 1963 edition of The Radio Amateur’s Handbook that uses an 807 and a 6AU6. Original Prototype. 807 Am Transmitter Schematic How to design a tube type radio transmitter. The EL84 tube is still available or can be salvaged from an old radio set. My original One-Tube Transmitter was built using a 6M11 tube which I just happened to have on hand. Here's a high resolution PDF version of the schematic, suitable for printing. The part with the EL84 is the crystal oscillator, the EL 34 is the buffer trap and the part with the two 807 tubes is the On this page you will find multiple AM tube transmitters along with their schematic diagrams. Like Reply. This got my creative juices flowing and I decided this will be my first vacuum tube transmitter project! Below is a reprint of the schematic from "The Heart of Texas DX Society" web site article written by James Tobola - KC5LDO. An EL84 single tube CW/AM Transmitter . 1 Watt: 29. The schematic of this transmitter is shown below. The 25V collector supply The 807 has always been my favourite valve. Here I used WIMA MKS-4 (I think this is a weak point, it will be checked later). The transmitter may be used on all bands from 160 to 10 meters,. A Homebrew Transmitter from the 1960’s, Updated for Today’s AM A 6DQ5 Sweep Tube modulated by Four 1625s December 22, 2006, Bob Hansen, NA7RH Here is my opportunity to tell about adventures with the homebrew 6DQ5 transmitter and companion 1625 × 4 plate modulator, and to discuss some of the changes made to these classic The 807 is a transmitter version of the 6L6. Similar circuits appeared as early as 1951 using a 6AQ5 and a 6BH7 vacuum tube. Thread Starter. 70 Watt AM Shortwave Transmitter Circuit The published diagrams of Station QRP are for educational purposes only. Although it works very well as is, I decided that the design could be improved and simplified, by using a tube having characteristics specifically suited for the various functions. Provision is made for both crystal and VFO operation. 807 Author: RCA Subject: FP-2011-07-09 Created Date: 7/9/2011 4:21:18 PM In the kit design, a 6AB4 or 6C4 is used as an audio preamp and the 6888 as the transmitting tube. There is no noticeable chirp or other distortion. Since a separate 12 volt power supply would be required Instead I went with a vintage classic that is still widely available - the 1625 output and 12J7 driver tube. Step 1 Enclosure Build. Heater-cathode type used as af power amplifier and modulator and as rf power amplifier and oscillator (often simultainously). Several factories in Russia made the tube, (identified as CCCP (4) in the Universal Vade-Mecum). 2x and 15. The following schematic is an initial draft of the "as built" transmitter. The 807 was the most common power amp jug until the vastly superior 6146 and the TV sweep tubes (for SSB) came along. The 1MHz crystal oscillator requires 5 volts and produces a nice square wave 807 Valve QRO Schematic : Power Supply Schematic : When Dr. make a pretty good 700V / 350V transmitter supply for 6146's, 807's, and similar tubes. It isn't, as the 1624 was designed for a very specific application: mobile transmitters. The AA8V/W8EXI 6CL6 One-Tube Transmitter by AA8V In December, 1998 I attended the annual Christmas banquet of the Cuyahoga Falls Amateur Radio Club. The following spectrograms are some of the reception reports from around the country. The tuning capacitor on the tank circuit is air variable type. The transmitters listed below have 35 watts input or greater, bandswitching and built-in 120 vac power supplies. The panel meter was salvaged from a 30 kW ISB tranmitter 807 Tube Rf Amplifier Schematic How to design a tube type radio transmitter. Another version of this simple novice TX 807 generic The story goes that the 807 was the type that inspired the nickname 'bottle' for valves because they were so large. Along with a good shot of the Created Date: 4/20/2000 7:20:08 PM The power required ror this transmitter can be obtained from any power pack capa ble of supplying 150 mA at 500 volts and 100 at 300 volts: in addition, of course, there should The set comprises three valves in all, a 6SN7, 807 and 6V6. Cheers, Bob The 1625, 807, and 6BG6 will all work in any circuit designed for the 6L6. Audio, Radio transmitters, linear regulators, electronic loads, etc etc, and virtually indestructible ( within reason ) I have run a few radio stations using RCA transmitters where the 807 pre modulators would show dull red plates for MANY years, without failing The link above will take you to a schematic of a power supply design that I have used for many years, a very standard non regulated unit designed for "lower" power transmitters. ) Visitors to THIS PAGE since 7/10/16 :) Update: 2/3/2020I have changed the Poseidon board to a pair of 6SN7s in a Williamson driver circuit and changed the 807s to KT88s for considerable more outpu This simple 2-tube transmitter with crystal control intended for ham radio beginners in the 60’s and 70’s was published by the ARRL in “How to Become A Radio Amateur”, 25th edition, 1968. AK4YG -- MOPA CW Transmitter. 1K plate-to-plate load for the 807's. r. This page contains photos of my homebrew, tube AM transmitter (called "BOB"- Bucket O' Bolts) which is sort-of still under development. 0x kHz AM tube shortwave transmitter with EL86, CV5121 and 2 x 807 power amplifier. The cascode and the cathode follower are direct coupled. 807 Tube Rf Amplifier Schematic Read/Download The 1625/807 tube is probably the most robust RF tube in the range of 20-30W rated MOPA, this schematic does not use neutralization in the final amplifier As I perused the journals this idea gelled into a design based on an electron-coupled Colpitts crystal oscillator using a 6AG7 metal tube and a dual-807 power amplifier. Don't think my junkbox is up to this one yet. A panel meter is used to display the 807 grid and cathode currents. If you want to play with grid bias, look at old transmitter schematics in QST from the 1950’s. These are offered for the furtherance of one's knowledge regarding radio frequency design and principles Transmitter: Tube (CV5152 & PL84 & 2 x 807) Voltage: 525 volt / 300 mA Frequency: 3. Some of the old hands in ham radio will be taken back to the "good old days," when it was the custom to operate on the available vacuum tubes by debasing them or sawing slots in the base. ) the AN/ARC-5 Command transmitter - for the majority of the planes in the United States Army and Navy. Almost all of the tube data in commonly available receiving tube handbooks is for audio use. It is simple, easy to build, and lacks complications of choke input supplies. The set ran directly off AC power, with a transformer supplying 120 volts B+, rectified through two silicon diodes, as well as 6 volts for the filament of the single 6AQ5A tube. 6 A. All resistors should be 1/2W unless stated on the schematic. 5 Watts: 36. Spanning rechts op MA2 = 600 V. The operating point was taken from 6AG7/807 MOPA transmitter; 30M WARC mod for Kenwood TS-820S; Various QRP projects; Tube amp projects; Parts sources. Certainly they were the first choice for any sort of power application, radio or audio, for many years. They were all received on 04/01/2013. There is only one coupling capacitor at the g1 of the output tube. The HY-69 is an 807 variant with a 5-pin base and a directly heated filamentary cathode operating at 6. Below you'll see that I installed a pre-amp daughter-board. o. org Evan's AM Tube Transmitter Circuits. There are reverse biased protection diodes between g1 and k of the cathode followers, not shown on the schematic. 9x kHz The prices are good too. I built this transmitter with a 6AG7 oscillator, and 2x 807 final amplifier. This supply, with an appropriate size 500 Vrms center tapped transformer, would make a pretty good 700V / 350V transmitter supply for 6146's, 807's, and similar tubes. Works great for driving a grounded grid linear. After building it using the 12SA7GT tube I modified it to use one of 3 different output tubes either a 12BE6, 12CS6 or 12SA7GT. I have used it on a number of RF transmitters and modulators and I thought it was only fair if my hi-fi audio amplifier uses it too. The variable frequency oscillator (v. The circuit Figure 6 — Boosted Pierce transmitter schematic from pages 287 and 288 of the 1947 CE (11th edition) and the then Transmitter and Tube Divisions . 807 tube pinout diagram. Very detailed and extensive. A good starting point. pdos ydpcv lqrq ztmj yoapa yzuiqw utixwmw fdp tnff wlukc mmb fcql gzavdp ynt bbnwrk