813 Linear Amplifier, The power supply will be 2x813 linear amplifier that I built. As a result I had to get a bit creative to get what I wanted. 199-201 A Compact 650-Watt Amplifier (two 4X250B) ARRL Handbook 1959, pp. Greg Latta - Main Page and Front and Side Views The Thivan Labs' 813 SE Integrated Amplifier featuring two 813 triode power tubes that puts out 45W of awe inspiring SET power ! I have a copy of GE Ham News from Nov-Dec 1959 that features a "Kilowatt Grounded-Grid Linear Amplifier" to quote the cover. . The amplifier works reasonably well on 160m through 20m after adjusting the input circuitry, biasing, plate choke, and The Cathode-Driven Linear Amplifier—William I. 210-214 A High-Power grounded-Grid Amplifier and Power Supply (one 3-1000Z) ARRL Handbook 1968, pp. This particular rig was our "pet" project. The button at the right will take you to a slide show summarizing most of the information on this site. I have never tried to put it on the air. Then the capacitors are wired in Classified: 813 Linear Amp. There was a big room full of WWII surplus gear. This home-brew amp with two 813 tubes for the final was made by an unknown amateur radio operator (ham) some years ago. I was thinking of 250 watts from two 813 tubes with ultra linear output transformer taps. In doing a bit of research, I found out that several people have run 813 tubes with 3Kv sucessfully with out damage. I found a great deal on some The AA8V Wingfoot 813 Amplifier - High Technology of the 1950's in the 2000's - by Dr. It uses a pair of 813s GG with a standard Pi Net output configuration 5 band switched 80 -10 mtrs. 10 gage teflon coated wire inside it. A Compact 3-500Z Linear Amplifier . Video of my latest project. Also, is there any reason not to use separate transformers for each needed voltage. RCA published an 813 Annotated Diagram of the main components of the 813. In class AB2 the 2x813 G2DAF linear amplifier With the 20A in good working order, I started to think about getting a bit more useful power output. On receive, R5 does the biasing, and puts the 813's into cutoff. air 813 Amplifier An All-Purpose 813 Amplifier Figs. This is known as a "bifilar tuned input". 2X-813 Linear Amplifier - Mates up with the Octal Tribander Transceiver. Whereas the HB-600 uses a pair of 572Bs, this amplifier uses a pair of 813s. The coil is 7 1/2 turns with an inside diameter of one inch, spaced as close as possible without shorting out the turns. As you can see, it is located in the bottom of the cabinet. A lot of the parts used in this project came with the transmitter. This document is a design note compiled during the design and construction of a linear amplifier. It is intended for SSB operation only. Classic amplifier designs from the late 1950s would squeeze 1,000 Watts PEP from a single device for SSB use. This amplifier without modifications will allow to use the GM70 and the 813 (FU-13) output tubes. sayer, WA6BAN 5—AMPLIFIER CONSTRUCTION An 811 A 200-Watt Grounded-Grid Linear Amplifier . This is the dual 813 grounded grid linear amplifier that was built to mate up with the Octal Tribander. The first coil is 3" diameter coil with 0. The document summarizes the process of building a linear amplifier using two 813 valves. It is heavy duty and well built. The principle of this bifilar solution was also shown in SSB for Radio Amateurs. The top piece of plexiglass has thru holes drilled so that they match the wiring terminals of each capacitor. The circuit is shown in 6-70. Output power 900-950w. Each one is close-space wound on a 3/4" diameter ceramic rod 3 1/2 inches long using 24 AWG enamel wire. I’m planning to build a linear based on two 813 valves in parallel and in the traditional grounded-grid configuration. It is intended as a catalogue of ideas and thoughts to be shared. D6 - D8 are glitch protection diodes for the meters in case of a negative going High voltage spike. Functionally, they operate the same way and either would need added tuned input circuitry if used with early vintage SSB gear that doesn't have a built in tuner. This holds the capacitors in place, yet allows them to be wired. I know, QRP is nice and also, one should be cure the antenna system to minimize losses and increase radiated power, but there are times when one may want a bit In the transmit mode, the zener diode provides the proper bias for the 813 tubes. Final (two 4-250A) ARRL Handbook 1959, pp. The 813 is a general-purpose transmitting beam power tube with thoriated-tungsten filament with a maximum plate dissipation of 125 watts. Pair of 813s in grounded grid put out about 600 watts PEP on 80, 40 and 20 meters. s. Listed under the Technical Reference/Amplifiers/HF Amplifiers category that is about Amateur linear amplifiers. , or s. Sold SOLD! I have a Home Brew Linear running two 813 tubes for sale. 2 grounded grid 813´s for the low bands, 80,40 and 20m. I can see it needs a little work. Provision has been made for convenient changing from one mode to an- other as well as to any of the bands from 80 through 10 meters. F4 provides further protection in the event of a catastrophic failure. The 813 is a good general purpose beam power tetrode and used to be popular with amateurs in the old days as a power amp valve. It’s a fairly powerful SE amp that works very well. Looks like someone started making some changes after the original builder built it. 205-209 4-250-A's in a 1-Kw. This later amplifier also has a mode switch to change the basic bias setting for linear SSB versus CW operation. The two chokes are mounted at right angles to each other, and have a . , a. operation. It can be an addictive past-time! The claimed performance and especially the 813 input circuit arrangement used by ZL1AXB seemed most attractive. This helps keep heat down. Orr, W6SAI, and William H. 高音質 chorale社 813 真空管パワーアンプ 直流点火改良品. 25" spacing. m. Discover (and save!) your own Pins on Pinterest A low cost 600 watt ultra-linear amplifier for 40, 20, 17, 15, 12, and 10m This compact little amplifier is the brain-child of Pat Murdoch, ZL1AXB, in Auckland, New Zealand. The 813 is one of the largest valves used in HF amateur radio. com) and covers 80, 40 and 20 meters. Based on what I had, I decided to change the power supply filter from a choke input filter to a capacitor input filter. It is the identical physical size and shares the same mechanical construction techniques for the cabinets, panel labeling and meter faces. My 813 Linear Amplifier Project Actually this rig came back to haunt me. I am assuming it to be about 35 to 40 years old. com website. As you can see, this is a typical 813 amplifier schematic with the exception of the input circuit. Greg Latta - Circuit Description and Schematic Daigram Does anyone know of a good tested schematic for a push pull 813 tube ultra linear design amp. I found a great deal on some The 2X-813 homebrew linear amplifier shown in Figure 1 was constructed to complement my Octal Tri-Bander Transceiver described elsewhere on the kg7tr. One end of the coil is connected to the filaments of the 813 tubes, and the other end is connected to the filament supply. An All-Purpose 813 Amplifier (one 813) ARRL Handbook 1959, pp. I was th Below are photos of the high voltage supply. It is a high voltage, low current beam tetrode. w. However we were having too much fun going "camping", (Gee whose rig are we gonna bring? 813 linear amplifier project includes many schematics drawind and assembling construction. with taps for the following bands: Reviews For: 813 Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. There is a dual gang 900 pf. RFC 1 is actually made up of two seperate chokes. The twelve filter caps are mounted "sandwich style" between pieces of plexiglass. 5" long and slipped a piece of Nr. More details of this part of the circuit are found on the 813 Input Circuit page. Challenges included getting the input circuit and tank coil tuned properly across bands. Vintage SSB Special - 20 Meter SSB Receiver and Transmitter The J-FET input operational amplifier features a high-speed PNP transistor in the output stage for stable operation at a high slew rate . You see when I was in high school, I was a member of an Explorer post that was into Amateur Radio. It is the same physical size and features identical styling. 01 uF @ 5 KV bypass capacitor to ground between the two chokes. b. It describes constructing the power supply with a 1000-0-1000V transformer and bridge rectifier. This exhibit was made in Canada and is badged Marconi. 6-69 through 6-72 show the circuit and photographs of an 813 amplifier designed for c. Electrically, the amplifier is very similar to the HB-600 linear (detailed at kg7tr. L1 is actually two coils in series. PLEASE NOTE THAT THIS AMPLIFIER WAS TUNED INTO A 1KW DUMMY LOAD AND NOT CONNECTED TO THE ANTENNA. I used a piece of 1/4 inch copper tubing 31. 199-204 One-Band Kilowatt Amplifiers Apr 2, 2025 - This Pin was discovered by Richard Palmberg. 小樽在住時、当時JLさんの店と呼ばれていたハムショップから中古の813を手に入れて以来、いつかは813を使ったリニアを組み立てたいと夢見てきた。しかし、E 813 Data Sheet #1 (Includes the base diagram, general specifications, and data for use as an AF power amplifier and modulator 813 Data Sheet #2 (Includes data for use as a plate-modulated push-pull RF power amplifier and as an RF power amplifier and oscillator 813 Data Sheet #3 (Includes characteristic curves and operating considerations) The AA8V Wingfoot 813 Amplifier - High Technology of the 1950's in the 2000's - by Dr. I also have an exter power supply. THE FREQUENCY ON THE TR The 813 is an RCA design. tpimy, shdy, 2nidgz, 4dzni, 45zf, 8qzs2, sfkmwl, svwgg, q6pz, i410vr,