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813 / GM70 amplifier with Bartolucci transformers
http://www.audiodesignguide.com/Claudio845/813amp.html
This amplifier without modifications will allow to use the GM70 and the 813 (FU-13) output tubes. The 813 is a general-purpose transmitting beam power tube with thoriated-tungsten filament with a maximum plate dissipation of 125 watts.
813 SE triode amps - Pete Millett's DIY Audio pages
http://www.pmillett.com/813_se_triode_amps.htm
The power supply I built for the 813 amp is a solid-state rectified supply that uses two large toroidal transformers, one for the high voltages, and one for the low voltages (filament power, etc.) It uses a microcontroller to sequence voltages at …
Search results for: 813 Audio Amplifiers – Mouser
https://www.mouser.com/c/semiconductors/audio-ics/audio-amplifiers/?q=813
813 Audio Amplifiers are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for 813 Audio Amplifiers.
813 Linear Amplifier Project - w4npn
https://www.w4npn.net/813-linear-amplifier-project/
813 Linear Amplifier Project. While stationed on Midway Island in 1971-1972, I operated as KM6DY, with an early model Yaesu FT-101 and a home made vertical on the roof of the apartment. The Navy decided to dump two old (1952) 10KW AM beacon transmitters into the ocean and replace them with modern units.
Audioromy 813 Amplifier - LAMPIZATOR
http://lampizator.eu/amplifiers/CHINA/audioromy/Audioromy%20813.html
The supplied 813's are obviously chinese made, but this radio broadcasting tube was popular worldwide in the 50's and is available as nos from many many brands. The similar amp at similar price is called Sound Track 813 Class A Integrated Valve Tube Amplifier and to me looks even better than Audioromy. Just look
Wingfoot 813 Amplifier - Main Page and Front and Side …
https://www.frostburg.edu/personal/latta/ee/wing813amp/amplifierpics1.html
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. In front of the transformer is a relay which switches the amplifier in and out of the feed line. This allows the amplifier to be used with transceivers.
813 Linear Amplifier | G4AKE
https://g4ake.co.uk/813-linear/
Figure 1 – Amplifier Front and side View – Panels Removed. The first version of this amplifier started service in the late 1970s and employed a pair of 813 tetrodes arranged in passive grid. That amplifier worked well but the power supply eventually failed making a mess. It was also dangerous (more dangerous than this one).
Vacuum Tube - 813, Beam Power Amplifier | Antique ...
https://www.tubesandmore.com/products/vacuum-tube-813-beam-power-amplifier
Vacuum Tube - 813, Beam Power Amplifier. $79.90. Quantity *. Add to cart. In Stock. Quantity in stock: 11. New-Old-Stock (NOS) tube. Also known by US military identifier VT-144. The 813 is a general-purpose transmitting beam power tube of the thoriated-tungsten filament type designed for use as an rf power amplifier and oscillator as well as an ...
813 Linear Amplifier - WB8ERJ
https://www.wb8erj.com/813mainsch.htm
As you can see, this is a typical 813 amplifier schematic with the exception of the input circuit. This is known as a "bifilar tuned input". More details of this part of the circuit are found on the 813 Input Circuit page. L1 is actually two coils in series. The first coil is 3" diameter coil with 0.25" spacing. with taps for the following bands:
Shuguang Vacuum Tube 813 For Tube Amplifier Replace FU13 ...
https://www.iwistao.com/products/vacuum-tube-813-shuguang-for-tube-amplifier-replace-fu13-high-power-output-quality-hifi-audio
Shuguang Vacuum Tube 813 For Tube Amplifier Replace FU13 High Power Output HIFI Audio. Tube 813 belongs to antique one, which is a direct thermal beam shot tetrode with thorium tungsten cathode, graphite anode. In the radio equipment, it can be used for the oscillator power amplifier tubes, and its using frequencies are up to 30MC.
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