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Single Ended Triodes (SETs), the ultimate tube lovers dream.

Reliability analysis


Direct Coupling: Dangerous cascading failure modes.. The upstream tubes grid bias condition is totally dependent on the downstream tubes plate voltage. That means if the downstream tube is unplugged, or its filament fails to ignite - you run the very likely risk of destroying the upstream tube. Sounds nice, no phase shifts like L or C coupling, but your opening yourself up to higher probabilities of catastrophic failure. Unfit for a commercial product design IMHO.

Capacitor Coupling: A leaking or failing cap can certainly induce failures but does not occur often. Phase shifts introduced by successive cap-coupled stages can setup the conditions for an unstable amplifier.

Tx coupling: Only failure mode is from a primary to secondary winding short. This would be caused by insulation breakdown. Very rarely happens.
An oddity if it does.


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