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Vollum scope - Electronics Magazine April 1948.jpg | Vollum scope - Electronics Magazine, April 1948 | Vollum scope - Electronics Magazine April 1948.jpg | Vollum scope - Electronics Magazine, April 1948 | ||
Septad511.jpg|511 ad from September 1948 | Septad511.jpg|511 ad from September 1948 | ||
Tek 511 ps.png | 511 non-A power supply schematics | |||
</gallery> | </gallery> | ||
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Tek 511AD top 3.jpg | Tek 511AD top 3.jpg | ||
Tek 511AD bottom 2.jpg | Tek 511AD bottom 2.jpg | ||
511a-ps.png|511A | 511a-ps.png|511A | ||
511a-vertical.png|511A | 511a-vertical.png|511A |