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6C45P Spud
6C45P Spud
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Old 26th January 2007, 11:52 PM   #1
serengetiplains is offline serengetiplains  Canada
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I finally got around to wiring this little firecracker into a single-stage amplifier ... sounds very good. I'm using 150VDC regulated supply feeding 5uF of film capacitance on the supply. To reduce the effect of power supply noise, I played around with various topologies, including WE cathode capacitor, using a transformer as a choke + attaching the secondary to the cathode (call it a WE cathode transformer), etc. These measures improved the sound, but left me unsatisfied. I also added inductance to the power supply (15H, 25H, 125H) but felt the inductor dulled the sound considerably. I then settled on wiring two tubes in parallel, feeding them with opposite phase inputs from an input transformer, powering them from the same supply, each with its own output transformer, and cross wiring the output transformer secondaries to the speaker (call it inverted, cross-wired parallel single ended). Lovely sound. Now to my question

Can someone pinpoint for me what I should look for on a scope to see if either of the tubes is oscillating?
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Old 12th September 2015, 02:24 AM   #2
Bigun is offline Bigun  Canada
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sorry of the late reply, it required a lot of thinking. You're looking for signs of very high frequency waves riding on the signal, or on the ground, or at the heater supply - possibly in bursts.
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