- Tube Amplifier Schematics
- 807 Tube Audio Amplifier Schematic Preamp
- 807 Tube Amp Schematic
- Tube Audio Amplifier Schematics
- This is the circuit diagram of 35W Tube Power Amplifier with EL34. This tube amplifier designed in 1953 and worked from 1954 until 1989. If you’re interested with classic circuit and classic components, then you should try this circuit. The circuit is interesting but i think it is hard to find the tubes. Schematic Diagram: Read More ».
- Dec 28, 2016 - This circuit is under:, circuits, 807 Tube Triode Connected l38787 This is a very nice amplifier design and it is very difficult to improve it. I am glad about the results because that's a very good way to verify my 6DJ8 and 6L6GC Spice models, like I tell you.
I used a push-pull-parallel set of 5B/854M tubes, which are basically 807 tubes in a slim bottle with a loctal base. 807's or 5933s can be substituted, as can 6L6 tubes or even 829B tubes. Download a PDF schematic of the amp wiring, the driver PCB schematic showing components for this build, and the power supply PCB schematic.
This is the circuit diagram of 35W Tube Power Amplifier with EL34. This tube amplifier designed in 1953 and worked from 1954 until 1989. If you’re interested with classic circuit and classic components, then you should try this circuit. The circuit is interesting but i think it is hard to find the tubes.
Schematic Diagram:
Power Supply:
Component List:
R1 = 470K 0,5W | R13-21 = 820K 0.5W | C8-9 = 0.1uF 630V |
R2-5 = 2K2 0.5W | R14-22 = 5K6? 0.5W | C10-14 = 0.47uF 630V |
R3 = 150K 0.5W | R15-20 = 680K 0.5W | C11-13 = 25uF 40V |
R4 = 220K 0.5W | R16-19 = 100K 0.5W | V1 = E80CC |
R6-10 = 56K 0.5W | R17-18 = 3K3 1W | V2 = E80CC |
R7 = 3.9K 0.5W | R24 = 470R? 2W | V3-4 = EL34 |
R8 = 220R? 0.5W | TR1-2 = 470R? 1W Variable (adj. 270O) | Rectifier tube =?Z2C |
R9 = 1M? 0.5W | C1-3-6-7 = 0.1uf 630V | T1 = Audio Transformer for 2x EL34 Push Pull |
R11 = 39K 1W | C2 = 220pF 600v | |
R12-23 = 180K 0.5W | C4-5 = 16uF 550V |
It is a classic design of power amplifier 35 W using tube, with two EL34 in connection Push-Pull, by Siemens & Halske, with design date 03/24/1953 and code SV410 / 1. The amplifier worked from 1954 to 1989, whenever and went off, with an average lifespan of 15 hours a day. Showed no particular damage beyond the replacement tubes, resistors and capacitors, resulting from natural wear.
A significant change was the replacement of the rectifier device of lamp diodes. The only problem will be for those who try their construction, will be the output transformer (applies to all tube manufactures), because the code is not helpful. Can be replaced with a conventional output transformer suitable for EL34. Illustrator cs6 for mac torrent. During the construction, it is need (applies to all circuits respectively) enough electronic experience and attention to the high voltage, electric shock risk.
source: http://users.otenet.gr/~athsam/Power_amplifier_EL34.htm
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a final amplifier has been added to my 807 transmitter. This pretty much finishes the electrical construction for this project. Some RF/safety shields are still needed but the rig is up and running. Here is a front view of the transmitter.
The MFJ-969 provides a dummy load and measures power output. Notice that two of the gas regulator tubes have virtually extinguished. They provide power for the 807 screen grid and need a boost in bias current. Otherwise the final is operating as expected. Here is a close up on the meters.
Control grid drive is 3mA (the voltmeter is configured as a 0-10 milliamp meter). Plate current is 85mA. Plate supply (not shown) is around 350 volts, giving a final power input of 30 watts. The MFJ shows a power output of 25 watts, which puts the 807 efficiency at 83%. That’s about as good as it gets in Class C.
Here is the rear view.
The octal socket on the rear panel of the final amp provides power and control lines for an automatic T/R switch. The T/R switch will be my next construction project.
Now the bottom view…
The final uses the same barrier-strip construction as the previous transmitter circuits. This modular form of assembly makes it easy to remove individual circuits for modifications or repairs.
Now some close-ups of the final amplifier…
Analog meters are a disappearing breed! I was fortunate to find these on eBay.
Corner braces and an aluminum bar stiffen the front panel. A pair of brass tubes are epoxied the bar and are used to route the meter leads. The coil was hand-wound on a 1” Schedule-40 PVC pipe using 1/8” copper tubing (refer to an earlier posting on the RadioBoard for winding technique). The base of the 807 is shielded with a “bath salts” tin from a crafts store.
Two variable capacitors in a pi configuration with the coil provide tuning and load adjustment.
Tube Amplifier Schematics
Being the classic that it is, there is a lot of literature on the 807. The 807 was derived from the 6L6 audio power tube and has some of its quirks. In particular is its tendency for VHF parasitic oscillation. In addition to the familiar RL plate stopper (shown in the previous photo), the 807 should also have stopper resistors on its screen and control grids. These can be seen on the above picture.Brass tubing provides shielding for the RF input and antenna output leads.
The final amp uses fixed grid bias so that a loss of grid drive shuts down the final (rather than melting the tube). Keying is done with grid blocking rather than cathode switching. That keeps hazardous currents and voltages away from the key and makes it easier the shape the on/off timing of the carrier wave. The disadvantage of these approaches is the need for a negative supply and extra components. I used a three transistor circuit to perform these functions. The circuit resides on the Manhattan-style circuit board to the left side of the picture.
![Audio amplifier design schematics Audio amplifier design schematics](/uploads/1/2/8/3/128391475/793246633.png)
807 Tube Audio Amplifier Schematic Preamp
The lower barrier strip holds additional silver-mica capacitors that can be added or removed from the antenna loading capacitor as needed. The other three barrier strips are dedicated respectively to the control grid, screen grid and anode circuits.
The transmitter needs a good checkout before it goes on the air. Pesky squirrels have seen to that already by chewing through my wire antenna!