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:
Audio tubes for any amplifier: from high end home audio to classic guitar amps. If you aren't sure about which valve you need, or what tubes you can substitute, let us help you. More electron tubes can be found in the tube store collection of New Old Stock (NOS) If you are looking for a tube shop carrying the very best tubes for your amplifier, you've come to the right place. 7025 / 12AX7A / ECC803S Tube Phono Preamplifier Schematic; Tube Amplifiers. 2A3 - directly heated power triode. SET 2A3 Tube Amplifier Schematic (EF86 input) - 3.5 Watts, SET, class-A SET 2A3 Tube Amp Schematic by Loftin-White (6SL7 SRPP input) - 3.5 Watts, SET, class-A 300B - directly heated power triode.
Look for schematics with 6L6GC tubes, it's essentially the same tube. Menno even published a SE 807 amp, the 'Maurits', if I recall correctly. I used a 807 PP in triode amp for years, very nice sound and cheap to build. Get your transformers from Wil Blaauw www.ae-europe.nl. Be sure to NOT order the transformer set for the Annastacia:-). First schematic had 6SL7 input tube and 6SN7 long tail phase splitter and 807PPP connected in triode or penthode mode through LL1620CFB. 807 and 6L6GC TUBE POWER AMPLIFIER / HYBRID CIRCUIT Phinoy itho hehe. D-Lab dual 807 Tube guitar amp project Creature. Cayin CS-845A Type UK Integrated Valve Amplifier Unboxing - Audio.
807 Tube Amplifier Schematic
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. During the construction, it is need (applies to all circuits respectively) enough electronic experience and attention to the high voltage, electric shock risk.
807 Tube Audio Amplifier Schematic Schematics
source: http://users.otenet.gr/~athsam/Power_amplifier_EL34.htm