You may basically add this to your amp, and it's both more clear and useful than the Fender way.Īs a bonus, it uses 2 Op Amps in parallel to drive the tank, to have more drive current available, but no big deal, you may use just one like most everybody else, so grand total is 2 x TL072. Here Laney also selects Clean/Dirty channels with a relay, and adds between preamp and power amp a nice Effects Loop and Reverb drive send/recovery circuit. So, although it may look complex, mainly because of the way it's drawn, it's actually quite simple and follows the classic recipe: part of the signal goes through a resistor, part is delayed, both are again mixed to get a reverb effect. U2a drives the high impedance tank, its output is reamplified through U2b, is controlled by Reverb pot R39 and then also goes to Dry/Wet mixing point TP23, through R38. You also have some signal attenuation, that's why you find here and there a few series resistors and others to ground, mainly because the raw tube signal may be way higher than what an Op Amp input can handle (30Vpp and preferrably a little less), I can suggest proper attenuation if you post your preamp schematic. Not really complex, what complicates it *visually* is the complex switching involved using those pesky Fender jacks which are full of internal switches, but if nothing is plugged into them, the path is the one I describe. Part of the signal (Dry) goes straight to Power Amp input (TP23) through mixing resistor R40, part of it goes to the Drive Op Amp U2a through C13. In the Hot Rod Deville they send the Preamp out, either from the last "clean" tube V2a or "dirty" from Master Volume R26, selected with Relay K2a, to the SS Reverb circuit. Old style tube + transformer driven reverb is nice, but nowadays only Boutique and a couple commercial models use it.Ĭheck these schematics to see how they do it: Yes, even Fender, Marshall, Orange, Laney, etc. Use the Op Amp, SS driven reverb, which 99% factories use today in their *tube* amps.
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