813 audio amplifier schematic pdf
Ran into something I want to be sure I have correct. I have the tubes hopefully connected in triode mode with G2 pin 3 connected to the plate cap via a ohm resistor and G3 pin 5 connected to ground. Looking at the one channel of the working bread board I left assembled for reference, I notice that I have G1 pin 4 connected to ground also through a 30k resistor, but I did not show it on the schematic nor do I see an explanation in my notes as to why I did that. Is it for the same reason as pin 5 going to ground, so that only grid 2 will be used as the cathode? In other words making it "triode mode"? Also why the 30k value for the resistor, and should I have a similar resistor between pin 5 and ground?
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Valve audio amplifier technical specification
It is the same physical size and features identical styling. Electrically, the amplifier is very similar to the HB linear detailed at kg7tr. It is intended for SSB operation only. Whereas the HB uses a pair of Bs, this amplifier uses a pair of s. As in the HB, the grounded grid GG configuration is used.
For s, that means grounding the screen grid and beam forming plates called suppressor grids in RCA s tube data as well as the control grid. When connected this way, it is surprising how closely the characteristics of the match those of the B.
Currently new Chinese tubes have limited availability, and are going for somewhat higher prices if you can find them. Meanwhile, after completing the HB I developed a desire to build another linear using s. If there is ever such a thing as a beauty contest for vacuum tubes, surely the would have to be a finalist. Of course beauty is in the eye of the beholder. So I started looking around for s at hamfests and on ebay. Eventually I acquired several tubes of mixed brands, as well as some genuine E.
Johnson sockets and Millen plate caps. On ebay I was able to find two pairs of new old stock NOS tubes with matching date codes. One pair was made by Ken-Rad and the other bears Westinghouse labels. I suppose it s possible that all of these tubes were made in the same factory and individually branded for a variety of manufacturers. Prices for the hamfest tubes were quite reasonable. In my opinion the is a more rugged tube, at least the ones made through the s.
My experience so far indicates they are very conservatively rated, and for the most part are bulletproof in GG service. I still check hamfests, classified ham ads and ebay, and s show up all the time.
There were lots of them made that apparently got snatched up by hams over the years. Whether due to an SK passing or just cleaning house, they are not too hard to find today. I think s offer a reasonably priced and classic way to homebrew a linear amplifier in the watt PEP class. They go on to cite a variety of reasons why a pair of s in GG is ideal for SSB transmitters available in the day. In , an exact clone of this commercial amplifier was presented as a construction article in GE Ham News.
Later issues of GE Ham News included errata, recommendations for alternate parts, and operating information on s in grounded grid service.
ER s online directory was searched for the keyword in all their back issues. Several articles described grid driven, plate modulated amplifiers, which were not really relevant to a GG design. Of particular interest here was the author s development of the tuned input circuits, which used techniques similar to mine.
All of this data was used as background for the design of the 2X amplifier described here. Later data sheets may cover GG, but I was not able to find any. Also available on the internet were a few blogs about using s in homebrew amplifiers. Some comments were positive and some negative. Of course the was never designed for GG SSB service, and it can t be expected to outperform, in every category, tubes like the B, z, Z and other triodes that were.
But despite the age of its design, it provides reasonable performance. The certainly deserves a measure of respect even today. The GE Ham News version shows a pi-net input circuit as an option. A tuned input circuit like that used in the 2X does provide definite improvements in distortion and efficiency, and makes the amplifier easier to drive.
In addition, the bias circuit used in those mid th century amplifiers seems a bit overpowered. I believe the 2X circuit design is a more sensible way to do it. Mechanical Layout Top and rear views of the 2X amplifier with the cabinet removed are shown in Figures 2 and 3 respectively. Figure 4 shows the rear view with the cabinet installed. The amplifier is built on a 13 x 17 x 3 inch chassis mated to a The arrangement of the RF components topside results in reasonably short leads.
Braided, tinned copper wire was used for the RF wiring. This might seem somewhat unusual, but the various components can move around relative to each other during handling. I didn t want to risk breaking the RF choke, tubes, variable capacitors, bandswitch or anything else by using heavy, solid wire. The PA tuning capacitor is mounted on top of the PA loading capacitor and is a dual section transmitting variable, pf per section.
The rear section is used on all bands, and the front section is connected by the bandswitch on 80 meters to provide additional tank capacitance. A side view of this arrangement is shown in Figure 5. A heavy duty, single pole, three position switch made by Radio Switch serves as the main bandswitch to select taps on the PA coil, as well as the front section of the PA tuning variable. As in my previous designs, a servo wheel from the RC modeling hobby is attached to the rear of the Radio Switch shaft.
This wheel is connected to another one below chassis by control rods. The wheel under the chassis is mounted to the shaft of another rotary switch that selects the proper input circuit for the band in use. The tube sockets are mounted to a plate that is recessed about 1.
This allows a little more clearance between the plate caps and the top of the cabinet. A box fan mounted in the rear of the cabinet blows directly on the tubes.
The power supply components are on the right side of the chassis. Notable here is the use of an Antek toroid transformer for the high voltage supply that will be discussed later. In front of the transformer is the high voltage doubler and filter board, mounted horizontally on threaded spacers.
Three NOS Triplett meters with custom designed scales are used to monitor plate current, grid current and plate voltage. This eliminates the need for a meter switch, and allows monitoring of everything simultaneously. This is especially useful for tune-up, where it is important to monitor grid current and plate current together for proper loading.
The underside of the chassis is shown in Figure 6. The recessed mounting of the tube sockets can be seen here. The filaments of the s require 10 volts at 10 amps total. MPJA no longer has stock on these. Still another way might be to modify the Antek toroid as discussed later.
At any rate, I did end up using the two transformers in series and mounted them to the side of the chassis. The filament choke runs from a terminal strip between the transformers over to the center of the tube sockets. The part number suggests it is a 10 amp choke, and it is wound with 14 gauge enameled wire covered with heat shrink tubing.
I was a little concerned about heat dissipation since the s would draw exactly 10 amps. But measurements of the voltage drop across each leg of the bifilar wound choke, with the parallel tube filaments as the load, indicate a total heat dissipation of about 3 watts. This barely warms the choke. The input network is in front of the tube sockets. The switch linkage from topside can be seen near the front of the chassis. The LC circuit values were determined by experiment to arrive at the lowest SWR between the exciter and the linear.
The three coils ended up being identical to the ones used in the HB The capacitors are slightly different. All of this again suggests the s look a lot like Bs in GG service. To beef things up, a section of 1. This angle also provides a mounting surface for the vertical plate used to mount the input bandswitch and coils. It was also necessary to provide a stiff foundation for the toroid transformer, which weighs 16 pounds and mounts with only a single bolt through its center.
As seen in Figure 6, a box structure beneath the transformer provides the necessary strength. To make the box, a right. A square plate of tempered. The toroid was mounted using the steel disk, two rubber pads and mounting bolt supplied with it. The reinforcements ensure the heavy toroid stays put and does not rock from side to side. A 6 x 6 x 2 inch chassis mounted in the corner of the amplifier chassis could probably accomplish the same thing.
Power control relay K1 is located inside the box against the side of the chassis. Soft start relay K2 is a plug-in unit mounted to the side of the box.
Construction of the cabinet is identical to the Octal Tri-Bander Transceiver and will not be discussed here. But somebody beat me to the last one that Surplus Sales had in stock.
So that led me to the line of toroid transformers offered by Antek antekinc. These are reasonably priced and conservatively rated. With the exception of a hamfest bargain with no tax or shipping, it would be hard to find a cheaper way to get your hands on a plate transformer like this.
Antek states their primary to secondary insulation is tested at 3, volts, but not specified is the insulation between secondary windings. In theory, the two volt windings could be connected in series and worked into a full wave bridge FWB rectifier with a capacitor input filter.
SERVICE MANUAL XM-2150GSX STEREO POWER AMPLIFIER
To cut a long story short , I am tired of making amps that weigh 30Kgs and my favourite tube is the Even the GM70 is not as good and neither is the or and even B doesnt have all the qualities of the , the 2A3 comes close but has no power The problem with SE amplifiers is that u need a very high voltage , lots of power , and even the driver stage has extreme requirments from a designer point of view. So how to solve all these requirments , I allready build an outerlimit , a Captain , and then the commercial version the Enterprise which is still available in kit or build. Powerwise a good Watts to be on the safe side including losses. But u need Volts high voltage , and Volts driver voltage at least
Diamond Audio Technology D5 300.2 Owner's Manual
The Navy decided to dump two old 10KW AM beacon transmitters into the ocean and replace them with modern units. I convinced the communications officer to allow me three days to pull parts off these transmitters before they dumped them and from these parts I built a A linear amplifier. I used that amplifier for nearly thirty years in various locations until the HV transformer shorted to ground and then I gave most of it to someone who really wanted a linear and had the parts and talent to replace the HV system. I am neither an engineer nor technically trained so my electronics knowledge is self-obtained and has lots of holes in it. I have a third with a steel plate and might do something with that later. A watt is a watt. Here is a.
807 Tube Data
It is the same physical size and features identical styling. Electrically, the amplifier is very similar to the HB linear detailed at kg7tr. It is intended for SSB operation only. Whereas the HB uses a pair of Bs, this amplifier uses a pair of s. As in the HB, the grounded grid GG configuration is used.
813 Tube Amplifier Schematic
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Ampeg Schematics
The Power Amplifier section employs only three transistors and a handful of resistors and capacitors in a shunt feedback configuration but can deliver more Finally, as the amplifier requires only a single rail supply, a very good dc voltage regulator capable of supplying more than 2 Amps 40V can be. 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. So here it is…. See more ideas about valve amplifier, vacuum tube, electronic schematics. The E55L runs at a moderate 30mA.
Tube DIY Asylum
Also See for D5 Table Of Contents. Quick Links.
In addition to the data I have scanned and posted, if you're looking for data on a particular tube you should visit TSDL on Duncanamps website, or Frank's tube data. Another spot to look, which is especially useful if you're looking for replacement types and tubes with similar bases or characteristics, is the NJ7P tube database. I've also posted Sylvania tube manuals on their own page. I recommend that if you don't already have it you download the latest version of Adobe reader. Some files have compressed images that may not work correctly with older versions of Acrobat reader. Excellent triode curves for the from Frens Mazenier 3.
This is a list of vacuum tubes or thermionic valves , and low-pressure gas-filled tubes , or discharge tubes. Before the advent of semiconductor devices, thousands of tube types were used in consumer electronics. Many industrial, military or otherwise professional tubes were also produced. Only a few types are still used today, mainly in high-power, high-frequency applications. Receiving tubes have heaters or filaments intended for direct battery operation, parallel operation off a dedicated winding on a supply transformer, or series string operation on transformer-less sets. High-power RF power tubes are directly heated; the heater voltage must be much smaller than the signal voltage on the grid and is therefore in the
Find More Posts by claudiomas. I have collected almost all my parts for a SE amp. The next hurdle besides settling on a circuit i want to copy, is the output tranny. Can you also specify the primary impedance, the current rating or wattage, and the secondary impedance.
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I wanted to take another look, but damn it .. I didn't have time!