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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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In Reply to: RE: WE 91A Clones Honorable Mention at least posted by vinnie2 on May 10, 2015 at 03:28:00:
How many of you built your 91 clones with that feedback loop included ?
That feedback was a terrific bandwidth extender. The first SE amps I made in the mid to late '80s were built on Thordarson T-30W08 chassis. Without that feedback loop, (also considered a tone control by some), the amps had flabby bass with little oomph. Add, or switch in that loop, presto change-O, better bass and dynamics instantly; especially with mid-grade opts like the early WE, Thordarson, UTC, Samson, General Radio, etc....even the early Peerless offerings to replace the WE 91 SE tranny...Keep in mind that theoretically, if a feedback loop is "before" the opt tranny, the opt is not considered to be part of the loop. Yet, sonically, the WE 91A (300A tube's plate to 310A screen grid) feedback makes quite an impact...
Also, looking closely at the Loftin-White scheme circa 1927-1929, the "raised" voltage on the opt tube filament(cathode) is connected to the front end input tube's plate...certainly considered a feedback loop by many...Connecting certain amplifier power supply caps' negative return lead to an output tube's cathode is also considered feedback by many soundmen...
So folks, please do not underestimate the potential benefits of all topologies...feedback included....
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Follow Ups
- WE 91A Clones all seem to Omit the Feedback of the original 91A amps... - Interstage Tranny 11:51:04 05/10/15 (3)
- RE: WE 91A Clones all seem to Omit the Feedback of the original 91A amps... - Frihed89 13:25:19 05/10/15 (1)
- RE: WE 91A Clones all seem to Omit the Feedback of the original 91A amps... - 91derlust 00:15:54 05/11/15 (0)
- More than feedback was omitted - Sebrof 12:27:12 05/10/15 (0)
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