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This is something I've been wondering for a while - how on earth did the Silvertone 1483, a 2X6L6 amp, get away with a 5y3 rectifier?
(Schematic is here: Prowess Amplifiers - Silvertone - Schematics - Silvertone 1483 )
I've had a few of these although at the moment I don;t have one here. One thing of interest is that every one I've personally had still had the original Silvertone branded tubes in it, including the 5Y3. So how were these 5Y3 tubes surviving the current demands of a 2X6L6 amp for 40+ years? The screen drop was not much (shared 1.5K resistor at the screen node), so the screens weren't keeping a lid on things. And, the power transformer was supplying 360 VAC, which right off the bat is 10V over the listed 5Y3GT max supply voltage. Data sheet shows max current draw at 350VAC input, capacitor input, at 62.5 mA, and those two 6L6 were probably darn close to that just sitting at idle.
Anyone have any comments on this, theoretical, practical or otherwise?
One thing of interest is the tiny little OT, no bigger than a Fender Deluxe Reverb OT. Again, not having one here at the moment, I know they are 8 ohm only but I don't remember the primary impedance although *I think* it was something like 5 to 6K. Could that wimpy OT have been playing a role here, somehow?
(Schematic is here: Prowess Amplifiers - Silvertone - Schematics - Silvertone 1483 )
I've had a few of these although at the moment I don;t have one here. One thing of interest is that every one I've personally had still had the original Silvertone branded tubes in it, including the 5Y3. So how were these 5Y3 tubes surviving the current demands of a 2X6L6 amp for 40+ years? The screen drop was not much (shared 1.5K resistor at the screen node), so the screens weren't keeping a lid on things. And, the power transformer was supplying 360 VAC, which right off the bat is 10V over the listed 5Y3GT max supply voltage. Data sheet shows max current draw at 350VAC input, capacitor input, at 62.5 mA, and those two 6L6 were probably darn close to that just sitting at idle.
Anyone have any comments on this, theoretical, practical or otherwise?
One thing of interest is the tiny little OT, no bigger than a Fender Deluxe Reverb OT. Again, not having one here at the moment, I know they are 8 ohm only but I don't remember the primary impedance although *I think* it was something like 5 to 6K. Could that wimpy OT have been playing a role here, somehow?
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