Acoustically Magnified Listening Apparatus (Headphone Amplifier)-1 : 無料・フリー素材/写真
Acoustically Magnified Listening Apparatus (Headphone Amplifier)-1 / Andrew Pilling
| ライセンス | クリエイティブ・コモンズ 表示-改変禁止 2.1 |
|---|---|
| 説明 | What you are looking at is my Jules Verne-esque Acoustically Magnified Listening Apparatus (Headphone Amplifier) that I designed and constructed. The original inspiration came from an old gasoline pump head. This build utilized a simple OTL amplifier circuit with parts consisting of a pair of 6CG7 vacuum tubes driving a pair of 12AU7 vacuum tubes, 3A 400V bridge rectifier and a power transformer concealed inside of a gutted out antique electric motor casing. A pair of small aluminum radiator covers that conceal an array of electrolytic capacitors. The radiator covers and some of the other hardware parts including the tube shields were coated with olive oil and baked in the oven for an aged look. I needed to purchase an 8" x 10" clear glass cylinder which I could not find, so I purchased an 8" x 12" clear glass dome. I was able to cut off the top end of the dome, creating the cylinder that I needed, using a tile saw fitted with homemade jig. Next the glass cylinder got rimmed with some rubber C channel edging. I also came into possession of several 13" copper charger plates. The copper plates underwent a chemical patination process which you can clearly notice in these photos. The bottom plate acts as the chassis base and the top plate acts as a vented lid, sandwiching the glass cylinder and electronic components which are being held tightly together with 8 staggered aircraft turnbuckles. I also incorporated a miniature ceramic base on/off knife switch / fuse holder, RCA input jacks, headphone output jack with volume control, plus I used an old telephony patch cable as the AC power cord. The OTL amp circuit is simple, transparent and of impeccable design. |
| 撮影日 | 2011-06-16 19:42:08 |
| 撮影者 | Andrew Pilling |
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