It’s not difficult to convert a silverface Super Reverb to blackface spec, and the end result will usually sound as good as or even better than its blackface counterpart. That said, do not attempt this modification unless you are certain that you know what you are doing. Silverface Supers are still very affordable, so it will be well worth paying a qualified amp tech to do this work if you’re in doubt about your electronics skills. If you decide to tackle it on your own, always be sure to unplug the amp and drain the power capacitors before getting started to avoid electrical shock. All resistors used should be carbon composition w watt, 5 percent tolerance or better.
Step 1: Rewire bias supply and add two 220kΩ resistors
Step 2: Replace four resistors in the phase inverter
Step 3: Remove the parasitic suppression caps
Step 4: Change the 5U4 rectifier tube to a 5AR4/GZ34 and you are ready to check bias range
Plug the AC line cord in and with the amp power switch “on” and the standby switch in the “standby” mode, put a DC voltmeter between point “G” (see Fig. 4) and the chassis ground. Adjust the bias pot until the meter reads -48 to -54 volts. If you cannot adjust the bias to get in this range, then the 15kž resistor that is soldered from the bias pot to ground (point “D” on figure 2) may have to be replaced with a 27kΩ resistor. There are several ways to bias an amp, but a nominal setting using the above method will be about -52 volts. Now go out and enjoy the sound of your blackface-converted Super! —Gerald Weber, Kendrick Amplifiers
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