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Tbirdkid
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Post subject: Looking For Webster 89D50 PA Amp Schematic  Posted: Dec Wed 23, 2020 6:05 pm |
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Joined: Aug Sun 23, 2015 6:01 pm
Posts: 1224
Location: NJ 08090
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Can't find any schematics on a Webster 89D50 in the shop now. It's a pretty robust unit with 12 tubes...and big trannys.
Tube Line up is.....
2-5U4GB....4-6L6....1-6SJ7...1-6SN7...1-6SL7...3-5879...1-SS455 Relay
Just checking if anyone has schematic info on this to share...
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BikenSwim
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Post subject: Re: Looking For Webster 89D50 PA Amp Schematic Posted: Dec Wed 23, 2020 6:17 pm |
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Joined: Oct Wed 14, 2009 6:36 am
Posts: 6346
Location: New York USA
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Nice unit! The 5879 are special low-noise preamp tubes. Hooked up to efficient Yamaha Club Series IV or similar PA speakers, this should be loud enough to peel the paint off the walls. Considering the surge voltages with fast warm-up 5U4, you may want to use 630 volt Solen Fast Poly capacitors instead of electrolytics, I did that for my Bogen PA amp.
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