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* [http://w140.com/tek_1l20.pdf Tektronix 1L20 Manual (PDF)] | * [http://w140.com/tek_1l20.pdf Tektronix 1L20 Manual (PDF)] | ||
* [http://ki3u.byethost3.com/Radio-PhysicsDIR/Substitute_uhf_osc_tubes_for_Tek_1L20.html Berj / KI3U's Page on 1L20 Oscillator Repair] | |||
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