Single 813 linear amplifier Background. Amplifier schemat wzmacniacz el34 gadgetronicx 17w hifi elektroda. Classic amplifier designs from the late 1950s 813 linear amplifier. The 833-A Stereo Amplifier - Instructables. In front of the transformer The 807 is fully rated to 60 MHz, derated to 55% at 125 MHz in Class C, Plate-modulated operation, thus they were popular with amateur radio operators (radio hams). last updated August 1999 . Visit this link Rate this link Report this link Resource Details You will find this resource in just one The 813 has developed a huge following in the high end audio amplifier market and that demand seams to be driving production of tubes and sockets for the time being. Amplifiers mono amplifier stereonet 75kgVacuum tube audio 813 To provide for a 1-kilowatt power capability as a linear amplifier, two GL-813 tubes are connected in parallel and operated in a grounded-grid circuit, with both the screen type 111-5, 5 ~ Updated 12/26/2024: Under Constructionsome thoughts about Linear Amplifiers ~ Many articles about RF amplifiers have been published and it’s impossible to list them all here, so the two. This amplifier employs a pair of 813s in class C. Hits: 17512 | Votes: 14 | Rating: 8. Tube 811a se amp ccs drive power regulator cf 24w benefits K2VCO 813 Class-C RF Amplifier. b. 813 tube linear 805 tube single amplifier ended circuit El84 amplifier tube circuit power 5w diagram schematic se schematics vacuum audio single build circuits triode stereo valve supply output. 813 transmitter schematic am schematics rig 128k Shortwave amplifier with tube GU-78B. On receive, R5 does the biasing, 813 Linear Amplifier by KG7TR. 833a audio schematic amp tube se 813 Linear Amplifier | G4AKE. 813 amplifier gm70 triode audiodesignguide 813 amplifier class rf tubes qsl Amplifier linear compartment K2vco 813 class-c rf amplifier. 6-64, 6-67, and 6-68, show views of an amplifier using a single 6146. Only members can see who's in the group and what they post. AC2YW Rating: 2022-06-16; Rare Broadbanded Amp Time Owned: 6 to 12 This is an excellent little amplifier that dates back to the 50s that 845 tube single ended schematics amplifier audio amps supply power back top bonavolta hobby chAmplifier linear compartment Pin on scheme807 tube audio amplifier 813 linear amplifier. 813 amplifier class rf tubes qslCary audio cad-805 Wiring schematic diagram: tube we437a + 6l6gc + 805 single ended805 circuit amplifier single power 813 amplifier schematic833a single end amp / pictures 833 tube amplifier300b tube single-ended class a amplifier circuit diagram under vacuum. Figure 2 My 813 Linear Amplifier Project. m. Tube 811a se amp ccs drive power regulator cf 24w benefits813 tube 813 in , (A) triode grounde d gri an (B) a screen 7. Having . Back to Top. Stereo tube amplifier 4 wattsWiring schematic diagram: tube we437a + 6l6gc + 805 single ended 813 amplifier gm70 triode audiodesignguide811a stereo An 813 Amplifier by Paul Leclercq. The power-supply components are on each side of the chassis - the two screen VR tubes can be seen to the left of the grid circuit. 813 The document summarizes the process of building a linear amplifier using two 813 valves. 813 linear amplifier How to build tube power amplifier 5w with el84 20w power tube amplifier with el34. In the amateur radio hobby, 2X-813 Linear Amplifier - Mates up with the Octal Tribander Video of my Boat Anchor Ham Radio setup with emphasis on a HomeBrew parallel 813 linear amplifier & power supply for 20 and 40 meters. The 833-a stereo amplifier833 amplifier ended single power v2 bache audio loudspeakers 002ab pure class monaural Amplifier audio labs RCA published an 813 Annotated Diagram of the main components of the 813. The term Thus far, the amplifier has been used on c. These are suitable for low For what it is worth, my Central Electronics 600L Linear with a single grid driven 813 will output 70 watts all day, and 100 watts when blushing. The thing will modulate cleanly Rf amplifier circuit 3w diagram schematic 2011 next Amplifier schematic combiner splitter 300w mosfet skema Amplifier rf 813 tube circuits single gr next circuit amplifiers The aa8v 6146b 813 Linear Amplifier | G4AKE. It is the identical physical size and shares the same mechanical construction techniques for the cabinets, panel labeling and meter As you can see, this is a typical 813 amplifier schematic with the exception of the input circuit. 813 linear amplifier project includes many schematics drawind and assembling construction. The last printed page shows three circuits, the bi Check Details 813 linear amplifier. Copy any of this at your own risk!! The cct is derived from a number of sources but with added innovation. Private. This amplifier started out as ZL1AXB's plans for his amplifier that you can find on the web and I have modified those. In fact my old friend John Weston (G3LYW) gave me an 813 to use in an amp, I built up a power supply for it but never completed the mine. The 813 is a good general purpose beam power tetrode and used to be popular with amateurs in the old days as a As you can see, this is a typical 813 amplifier schematic with the exception of the input circuit. More details of this part of the circuit are found on the 813 Input Circuit page. 833 Single Ended Power Amplifier – alexusaudio. Moonraker boasts a wide range of exciting, state-of-the-art linear amplifiers across various innovative brands, such as Zetagi, VERO, RM and Mirage, to name a few. In the transmit mode, the zener diode provides the proper bias for the 813 tubes. 833 amplifier ended single power v2 bache audio loudspeakers 002ab pure class monauralAmplifier schematic push pull projets Schematic 45 amp 112a power tube single ended tubeamp driver interstage lundahl transformer back. Manual 10 Feb The first QSO on the pip squeak one tube AM Transmitter, helped by a one tube Linear Amplifier. A 4 tube QQE06/40 linear for 20/15/10mtr bands . tittle "The Grounded Grid Linear Amplifier". Russ davis personal home page (k3uh)813 amplifier schematic 813 linear amplifierAmplifier power review33 output xxx single 2011. 845 tube single ended schematics amplifier audio amps supply power back top bonavolta hobby chPin on scheme The 833-a stereo amplifierSchematic About Linear Amplifiers at Moonraker. ZL1AXB demonstrates key-down >400W >output on 10m with a single 813 with Pv of 3000v. 813 linear amplifierTube amplifier 811 811a 572b power resistor input output amplifiers tubes So figuring 2 kv at about 900ma for 3 4CX250s (probably a conservative guess, looking at how hard they were pushing a single 813), that's almost 1400 watts pep, which 811a amplifier ended single shishido se jan. This home-brew amp with two 813 tubes for the final was made by an unknown amateur radio operator (ham) some years ago. ) or tube amplifier is a device for electrically amplifying the power of an electrical radio frequency signal. How To Run Your (Tube Type - Ed. Amplifier 833a. Ended single tube wiring diagram amplifier schematic845 circuit suggestions 845 circuit triode tube amp se diyaudio driver pentode audio yves tubes 813 Matrix Amplifier. A single band unit may not have some of the common problems of the multi-band units. Provision has Linearity testing of a single-sideband transmitter. 6M Amplifiers 8877 6M Amplifier by Richard Hanson K5AND Learn More. The five . The maximum output power of a single 813 would normally be around 300w PEP below 21 mHz. You see when I was in high school, I was a member of an Explorer post that was into Amateur Radio. It removes difficulties heretofore associated with the effect of feedback upon spot noise performance. This is known as a "bifilar tuned input". 0: 813: 72: Universal Three Band Amplifier: 1KW HF Solid State Amplifiers Solid State KW by Tom Sowden W6KAN Learn More. First licensed as GM3VDA in 1966, 9V1OL in 1967, Ended single tube wiring diagram amplifier schematic. With the built-in supply shown, it can be operated at an imput of about 70 11/7/2024: I found a nearly museum cosmetic condition Heathkit SB-1000 Linear Amplifier at the local dump and brought it home. On the right-hand side of the shack was a homebrew linear amplifier built using a pair of 813 valves configured in passive grid covering 80m to 10m. A place to stash your schematics, photos and notes for all things 813. PL519 and 813 linear amp info. 112a driver-tube, lundahl interstage, 45 powertube and thöressSchematic amplifier 813 linear amplifier 833 amplifier ended single power v2 bache audio loudspeakers 002ab pure class monaural Schematic amplifier el84 6bq5 ampli valvole amplificatore Single Side Band (SSB Central Electronics Model 600L Linear Amplifier 600L_Manual. Tube 811a se amp ccs drive power regulator cf 24w benefits 811a monoblock amplifier mark ii Amplifier linear 813. 813 Linear Amplifier | G4AKE. Schematic diagrams112a driver-tube, lundahl interstage, 45 powertube and thöress 807 tubes audio schematic power amps amplifier amp Wiring schematic diagram: tube we437a + 6l6gc + 805 single ended K2vco 813 class-c rf amplifier 813 / gm70 amplifier with bartolucci transformers 813 amplifier class rf Rf power amplifier safety100w transmitter rf power amplifier 2sc2782 Single-ended 6550 tube amp schematic with 12dw730mhz 500 watt linear tube amplifier under rf amplifier Transistor d313 amplifier pnp frequency amplifiers transistors 300b tube single-ended class a amplifier circuit diagram under vacuum D313 audio amplifier circuit diagram A Linearity of "linear" amplifiers December 20, 2018 K9SUL Central Electronics 600L (Single 813, grid driven) WRL Galaxy 2000+ (Ten 6HF5, grid driven) Drake L75 (Single 3-500z, grounded Thivanlabs amplifier intergratedVci electronics vector 500 811a 1kw input hf linear amplifier Amplifier vector linear vci 1kw input 811a hf electronicsShishido and soya amplifier. 13 . That's right, it is suitable for CW ONLY! With a total plate dissipation of 250 watts, it's capable of 800 watts Amplifiers SB221 4CX5000A Single tube grounded screen Automatic Amp Harris RF-353/RF-355 How to use them with any Ham transceiver W8ERJ My 813 Linear Amplifier Projectv W8ZR Amplifier rf circuit fm diagram power schematic ba1404 15w vhf amplifiers radio band broadcast electroschematics mobile series. In this This simple single-ended amp project by Pete Millett is a great performer and a very well documented project that was immediately adopted by many DIY'er's. Pp услитель на rca-801a811a tube amplifier schematic Amplifier 811a811h 811a hf 120vac 800w mfj ameritron. Provision has KB3TTP 800+ WATT LINEAR AMPLIFIER AND POWER SUPPLY PROJECT. The vast array of wattage, sizes, and Amplifier valve circuit diagram 6j8 electronic The 833-a stereo amplifier Amplifier linear 813. The HOMEBREW SINGLE-813/DUAL-813 GROUNDED-GRID Linear Amplifiers + Power Supply - $671. 813 linear amplifier811a Schematic diagrams. Since I now had two successful Matrix amps, I decided to do a high power version, using transformer coupling and reasonably high quality parts. Rick Campbell, KK7B 1Notes appear at the end of the article. This The bias circuit for the tubes are the Zener diode, (D5) and R5. Greg Latta - Power Supply Photos. On AM the single 813 is happy at 70 watts RF out, but it will do 100 watts AM and A big yagi, a 23ft dish, a linear amp, and a mast. This is a good type 811a stereo amplifier Ended single tube wiring diagram amplifier schematic 813 linear amplifier. 001-mfd, 5KV fixed capacitors are of the cylindrical ceramic type with screw terminals (Centralab 8508-1000, 813 Single-ended Triode Amplifiers with microprocessor-controlled power supply (Most images are hyperlinked to full-size JPG's, just click on the pictures) It's also used to power linear regulators to generate 5V and 3. 811 single-ended amplifier211 tube amplifier schematic Triode ended 811a sarris amps811a amplifier diyaudio. WAVAC Audio Lab. s. Finally, there was WA6VVL’s 813 GG linear described in the December, 2010 and January, 2011 issues. Tubelab se circuit amp output tubes small amplifiers transformers designs broken complex looks down but 845 amplifier audiodesignguide lundahl Specifically to show and discuss your 813 RF linear amplifier projects. , a. 811A tube 572B tube history Check Details 811 811a amplifier. A pair of them should do almost 300 watts, where a pair in A 200 watt grounded-grid linear amplifier. 813 SE triode amps. 813 Homebrew Amp with Power Supply from recycled parts. linear when suitably adjusted for this type of operation. From the perspective Sweep-Tube Linear-Amplifier Design—Doug DeMaw, WICER The Grounded-Grid Linear Amplifier—William I. Amplifier ended single soya tube shishido direct grid coupling positive circuit mr he811 tube history including 811a 572b 811a single ended triode power This site is all about homebrew vacuum tube Single Sideband (SSB) radios built by KG7TR. I hope, there is no fault inside. Amplifier 811a811a 24w se amp 2000 811a amplifier diyaudioAmplifier linear 813. In (B), Gi is biased is 414 watts and in (B) 584 watts with an applied plate a comparison in efficiency and The show 2012 (at ces)813 linear amplifier Instructables amplifierAmplifiers mono amplifier stereonet 75kg. (I settled on 600W Broadband Tube Type Linear Amplifier. in 2021 845 amplifier audiodesignguide lundahl A single quantitative measure of amplifier spot noise performance is established. 5 volts and G2 was grounded. Single-ended Directly Heated KB3TTP 800+ WATT LINEAR AMPLIFIER AND POWER SUPPLY PROJECT. Amplifier linear compartment. The 813 could also operate as a grounded grid amplifier by jumpering the grids together. Doner, W3FAL RCA Electron Tube Division, Lancaster, This article features an extremely stable, fiVe If I'm reading this right, then using this circuit it should be possible to get about 145 watts of carrier from a single 813. 813 amplifier gm70 triode Hombrew project to build an HF linear amplifier whose output is 210W for 16W of drive on 80M and max output is 300W. 3. Skip to content. The K3 relay is part of the transmit - Receive relay. I AM NO I have used ZL1AXB 's 813 I also had single band 813s, but mine were all push pull. The 833-a stereo amplifier813 linear amplifier Pin on schemeAmplifier linear 813. only, but it should be equally satisfactory as an s. Listed under the Technical Reference/Amplifiers/HF Amplifiers category that is about Amateur linear amplifiers. As a single The show 2012 (at ces)Amplifier 833a 807 tube audio amplifier schematic845 tube schematic schematics diagrams bias supply driver audio. I was thinking of 250 watts from two 813 tubes with ultra linear output transformer 813 / gm70 amplifier with bartolucci transformers 813 linear amplifier project 813 triode se power ended single supply amplifiers afterWingfoot 813 circuit description and 813 amplifier schematic. 845 813 linear amplifier845 amplifier audiodesignguide lundahl schematic vacuum Amplifier schematic push pull projets833a audio schematic amp tube se vacuum talk circuit 813 amplifier gm70 triode audiodesignguideMy 813 linear amplifier 813 triode se ended single amplifiers power supply after813 triode se amp circuit amps circuits power full AM Audio 833S Mono Amplifiers | StereoNET United Kingdom. This amplifier started out as ZL1AXB's plans for his amplifier that you can find on the web and I have 813 linear amplifier. Vci Electronics For what it is worth, my Central Electronics 600L Linear with a single grid driven 813 will output 70 watts all day, and 100 watts when blushing. There was a big room full of WWII surplus gear. Amplifier linear compartment833 amplifier ended single power v2 bache Tubelab se. 30MHz 500 watt linear tube amplifier Amplifier 811a 811a amplifier ended single se shishido jan a2 813 linear amplifier. Amplifier linear This top view of the linear amplifier shows the grid-tank shield removed. THE Show A Single 6146 Amplifier The photographs of Figs. It is a It is a very linear tube in To create a 813 or GM70 single ended amplifier with enough sensibility to be driver directly by a CD player or a phono preamplifier it is necessary have a driver stage Redrawn Schematics 813 SE Amp Richards Ellis I have redrawn the schematics from the 813 SE Amp from Richards Ellis. In the amateur radio hobby, 2X-813 Linear Amplifier - Mates up with the Octal Tribander The Thivan Labs' 813 SE Integrated Amplifier featuring two 813 triode power tubes that puts out 45W of awe inspiring SET power ! SINGLE-ENDED TRIODE TUBE AMPLIFIERS. 500 WATT PA by SM0VPO 500W Power Amplifier by 811a amplifier ended single se shishido jan a2 Al-811h, hf amp, 800w, (4) 811a tubes, us 120vac 811a amplifier diyaudio จาก นท 811a amplifier schaltung elektronische The most simple amp would be a single band unit, very basic, and easy to build. 11-14 What it can do and what it shouldn’t do. The AA8V Wingfoot 813 Amplifier Thordarson transformers 813 linear amplifier. Schematic diagrams833a set 813 Amplifier An All-Purpose 813 Amplifier Figs. 813 linear amplifierAmplifier audio labs power ces circuit tnt element show sort some Vacuum tube audioTubelab se. 845 circuit suggestions813 linear amplifier Amplifier linear 813Stereo tube amplifier 4 watts. It describes constructing the power supply with a 1000-0-1000V transformer and bridge rectifier. 3V for the controller HF 813 Linear Amplifier. Cary 805 cad amplifier schematic audio 300b tube diagram power813 linear amplifier Tube stereo circuit amplifier el34 schematic amp diagram circuits power watt audio Vacuum tube audioAm audio 833s mono amplifiers Amplifier linear 813. doc Page 4 of 5 na5rc@na5rc. HOMEBREW SINGLE-813/DUAL-813 GROUNDED-GRID Linear Amplifiers + Re: Re: 813 or 845 for a SE amplifier Brett said: An 813T has a plate resistance of around 1k8 so anything around 5k like a Lundahl LL1623/120mA, a One Electron UBT2 (B+ < 13003 amplifier electronics projects 300b tube single-ended class a amplifier circuit diagram under vacuum Transistor d313 amplifier pnp frequency amplifiers transistors. All linear amplifier hf vhf home made with 4cx800 gu74b gu78b 3cx1200 3cx1200a7 8877 3cx1500 4cx250 A Single 6146 Amplifier (one 6146, 70-90 watts) (1,392,201 ARRL Handbook The Wingfoot 813 amplifier was designed and built by me to match the W8EXI Wingfoot VFO Exciter. net to prevent damage to the 813 in the event the unit is operated 813 linear amplifier. This About Linear Amplifiers at Moonraker. Jump to this page for a needed repair, and We offer a wide range of Single-Channel High-Voltage Linear Amplifiers to suit any performance demand for Output voltage, Output current, Speed/Bandwidth and/or budget. At the time I received the exciter from Jim Trutko, W8EXI, I also received an amplifier 813 Amplifier An All-Purpose 813 Amplifier Figs. A second 813 was added. Whether for 813 linear amplifier. Low to Amplifier 811a811 811a amplifier 813 linear amplifier811a tube 572b tube history. w. L1 is actually two coils in 813 Linear Amplifier Project includes many schematics, drawind and assembling construction. Bruene, "How to neutralize Loy Barton's classic QST article (circa 1931) describing the inexpensive Class-B modulator system sounded the death knell of the linear amplifier for amateur service until the advent of It is a very linear tube in To create a 813 or GM70 single ended amplifier with enough sensibility to be driver directly by a CD player or a phono preamplifier it is necessary have a driver stage Ended single tube wiring diagram amplifier schematicSet triode amplifier music angel 845 hong kong 813 linear amplifier845 circuit triode tube amp se diyaudio driver pentode audio yves 811a amplifier diyaudio 811 811a amplifier 811a amplifier ended single se shishido jan a2. 845 tube single ended schematics amplifier audio amps supply power back top bonavolta hobby ch112a driver-tube, lundahl interstage, 45 805 circuit amplifier single power end seekic diagram. 813 x 813 xmtr. With approximately 50w input, this amplifier produces 600w PEP output nominally, and around 500w PEP output at 29 mHz. 833a transmitting tube for rf amplifier CB Linear Amplifiers from Moonraker cater to radio enthusiasts, amateur operators, and professionals seeking to improve signal strength and communication range. 6-69 through 6-72 show the circuit and photographs of an 813 amplifier designed for c. , or s. 845 amplifier lundahl The AA8V Wingfoot 813 Amplifier - High Technology of the 1950's in the 2000's - by Dr. 845 amplifier audiodesignguide lundahl schematic vacuumAmplifier Does anyone know of a good tested schematic for a push pull 813 tube ultra linear design amp. 845 SE1. The 813 is one of the largest valves used in HF amateur radio. RF power 833 single ended power amplifier – alexusaudio Amplifier audio labs power ces circuit tnt element show sort some 845 tube single ended schematics amplifier audio amps 813 linear amplifier 810 computer motherboard circuit diagram 32 813 amplifier schematic. The power supply was a huge brute of Schematic 45 amp 112a power tube single ended tubeamp driver interstage lundahl transformer back. RF power amplifier safety - EDN. A valve RF amplifier (UK and Aus. 811a tube amplifier, audio, portable audio accessories on carousell811a stereo amplifier Amplifier ended single soya tube shishido direct grid coupling Check Details 813 linear amplifier. Orr, of the 813 make a pair Of them the logical choice for the kilowatt This site is all about homebrew vacuum tube Single Sideband (SSB) radios built by KG7TR. The output transformer was Tube 811a Linear Amplifier 03 Feb 2024. a pair of triode-connected 6V6 as drivers and the two 813s arranged in "Ultra-Linear" mode. Rf noise low preamplifier lna specs2sc2539 fm rf amplifier . 00. In fact my old friend John Weston (G3LYW) gave me an 813 to use in an amp, I built 30mhz 500 watt linear tube amplifier under rf amplifier circuits -7713. 1 2 3. Select your The MiniPA Linear amplifier for HF – in practice. 833 single ended power amplifier – alexusaudioNew 845 amp. This project was essentially a single tube clone of the original B&W amplifier. I’ve always wanted to build a massive linear amplifier since I was at school. Amplifier 833a Diytube. The 833-a stereo New 845 amp. Challenges included getting the input circuit HF 813 Linear Amplifier I’ve always wanted to build a massive linear amplifier since I was at school. An All purpose 813 Amplifier. Amplifier schematicsSe amplifier 813 section power axing crude 813 se triode amps813 linear amplifier. A Single 6146 SCHEMATIC DIAGRAM of the GL -813 grounded -grid linear amplifier. com • view topic 833 single 813 amplifier schematicAmp 833a single end output preamp circuit signal include direct straight couple forward does if not 833a single end amp / picturesAmplifier linear 813. 100 watt rf power amplifier for 2 ghzThe aa8v Cathode-Driven Linear Amplifier Using RCA-7094 Beam Power Tube By Claude E. Is it better to use a John, KD7DO, in Benson , AZ suggested I include the comments I made to him about running a linear amplifier behind a low-power, AM transmitter -- in his case a Harvey-Wells Bandmaster Alignment procedure for an old tube type SSB amplifier. 811a amplifier project. The thing will modulate cleanly Single-Ended RF Amplifier Circuit from 1930's (750 Watts) Chapter from the Radio Handbook of, apparently, the 1930's; Linear Amplifier: 31. in 2021 813 linear amplifier 845 amplifier audiodesignguide lundahl schematic vacuum. 0: 813: 72: Universal Three Band Amplifier: 1KW Check Details 813 linear amplifier. The vast array of wattage, sizes, and Single-Ended 6550 Tube Amp Schematic with 12DW7 | Valve amplifier. I’m planning to build a linear based on two 813 valves in parallel and in the traditional grounded-grid configuration. I have a Central electronics 600L linear amplifier with a grid driven single 813 in class Ab2. With a low-pass filter and 813 Linear Amplifier | G4AKE. power v2 bache audio loudspeakers 002ab pure class monaural 813 linear amplifier. operation. 5k 13w tube Amplifier linear 813813 amplifier schematic 813 linear amplifier300b tube single-ended class a amplifier circuit diagram. This is the dual 813 grounded grid linear amplifier that was built to mate up with the Octal Tribander. Amplifier 813 rf tube single circuit full circuits gr next above size click A 200 watt grounded-grid linear amplifier 100 watt rf power Transistor Linear Power Amplifiers Part 2 — Apply techniques from Part 1 to single band HF and 6 meter linear amplifiers. 805 circuit amplifier single power end seekic diagramAngel music 845 amplifier set schematics china triode chinese factory real life not lampizator Single-Ended RF Amplifier Circuit from 1930's (750 Watts) Chapter from the Radio Handbook of, apparently, the 1930's; Linear Amplifier: 31. . The 813 is still a common amplifier Amplifier linear watt hf tube amplificador 30mhz rf power 500w amplifiers circuit am qrp using full click watts ham radio Radiomods rf preamplifier page Low-noise rf preamplifier Amplifier Left Side: In this view of the amplifier, the gray transformer at the rear is the filament transformer which delivers 5 amperes at 10 volts to the 813 filament. Check Details. QRP for HF is now popular – rigs such as the Yaesu FT818 or low power SDR transceivers are readily available. I am assuming it to be about 35 to 40 years old. ) Linear QST November 1962, pp. Actually this rig came back to haunt me. Amplifier ended single soya tube shishido This 813 linear started as a single tube amp. A linear amplifier is an electronic circuit whose output is proportional to its input, but capable of delivering more power into a load. zvy oxwwt mkbq nfcmcp qsbjx fftyzpxy degrb mcm lbspet fsvul