Lampvõimendi projekt 2x9W SE 6P36S ja 6N8S lampidel

Lampvõimendi projekt 2x9W SE 6P36S ja 6N8S lampidel

ID товара: 180955358 Состояние: использованный Срок доставки: 7 дней
Aукцион закончился или неактивен.
Aукцион закончился или неактивен.
Окончательная цена: 58.00 EUR
Продление окончания: 5 минут
Начало: Вт 06.09.2022 16:52:59
Окончание: Вт 04.10.2022 16:56:05
Просмотров: 869
Последний претендент: avz1
Tallinn, Harjumaa, Eesti
1
Продавец:
MK100%положительный отзыв
116 oбратная связь    6 подписчики
Состояние: использованный
Расположение: Tallinn, Harjumaa, Eesti
Koл-во: 1
Срок доставки: 7 дней
Оплата: депозитный платеж, оплата э-счетом Оsta.ee
Продавец: MK100%положительный отзыв Посмотреть другой товар

Müügis iseehitatud ja toimiv lampvõimendi projekt 6P36S ja 6N8S lampidel. Sai kunagi ehitatud Tallinna Polütehnikumi praktikumide käigus. Sobib edasi arendamiseks või varuosadeks. Heli on hea ja ehitamise hetkel mõõdetud moonutused ning sagedusriba vastas oodatavale tulemusele, mida nende lampidega on võimalik saavutada. Igapäevaseks vaikseks kuulamiseks ei sobi, sest toitetrahvo undab liialt. Samuti ei vasta lahendus hetkel ühelegi elektroonika ohutuse nõudele ega heale praktikale. Välimus näha piltidelt.

Viimastel piltidel on näha skeem. Samuti on dokumenteeritud trahvode pinged ja mähised. Toide erineb skeemist. Kasutatud pole 5C9S lample vaid pooljuhtidel sildalaldit. 

Kirjeldus veebilehelt, mille järgi võimendi on ehitatud:

9W Triode connection circuit Vacuum Tube Amplifier

At manufacturing this amplifier there was set a task to make easily to the ordinary radioamateur repeated device. Also the purpose was not high power, but high quality of sound in a room of the average size.

At designing the mistake when not enough attention addresses on the power supply is frequently done. In fact actually all signal goes not only through the amplifier but also through a power unit. The amplifier and power unit under the current of a signal are connected consistently. Therefore all distortions from a power unit will be in a musical signal too.

Power tube driver is SRPP type, assembled on tube 6N8S (6SN7). This circuit, when operated on the full 340-volt plate supply shown, can drive a single 6P36S (EL500) effectively. Cathode current to 6P36S is Ia=65mA. Grid voltage about -45V.
Quality of the capacitor C1 is important. Quite good results with capacitors paper in oil type.

Transformers U type core is made of high-grade electrical sheet steel. The sizes of section are 36x32 mm. Primary winding partitioned in two sections 1-2 and 3-4, every section consists 900 winds of 0.25mm diameter wire. The secondary winding (7-6, 5-8, and 9-10) is wound between sections of the primary winding. Every secondary section consists 120 winds of 0.5mm diameter wire.  Sections of primary winding connected in series, sections of secondary paralelled. One final point of interest with a S.E. transformer is the air gap. This is necessary in order to bring the operating point of the core to the correct region on its B-H curve. Paper spacer 0.2 mm thickness is applied. The transformer is designed on 8 ohm speakers.
Power transformers core toroidal type, section 4x4 cm.

So I'll simply say it sounds wonderful, extremely clear and dynamic.

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