SE amplifier on the G-807 lamp from Manakov A.I. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Tube Power Amplifiers
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Amplifier circuit made by Igor Butin based on a draft by Anatoly Manakov.
The single-ended amplifier is made on a G707-6P7S lamp connected with a tetrode with 2 OOS. As a driver, a 6N2P lamp was used in parallel connection, which reduces the output impedance of the cascade, the use of which is due to the high gain.
There are 2nd OOS, common, from the secondary winding of the output transformer to the cathode of the 1st stage, which linearizes the overall frequency response of the amplifier and reduces its output impedance, and a local, anode-grid of the output lamp to reduce the resonances of the output transformer due to the high resistance of the output lamp when it is normally turned on.
Amplifier output power 7-8 W
The output transformer is made on iron Ш32 x 60
Primary winding - three sections of 1200 turns connected in series, wire 0,35.
Secondary of 4 sections, two middle ones of 220 turns in two layers of wire 0,9; connected in parallel.
The lower and upper windings of 110 turns of the same wire are connected in series and connected in parallel to the average for a load of 8 ohms, or connected in parallel and connected in series to the average for a load of 16 ohms.
Amplifier frequency response 25 Hz-25 kHz.
In the future, this transformer is suitable for working with 300V lamps. Wish: do not use lamps of the second freshness!
Authors: Igor Butin, Anatoly Manakov; Publication: cxem.net
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Comments on the article:
a guest
Offset error
Sasha
Could you send me the amplifier circuit and advice on output trances for the GU72 lamp? peacemaker1f@mail.ru
a guest
Displacement closed to ground...
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