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You have to add resistors in series with the 1N4007 diodes to make them operate at a slight loss as the original seleniums. If you just use them in place of the seleniums, the voltage will be too high and the electrolytics can be stressed. Also, the set may show problems that are not parts related. My TS-4 had sync problems until I put 33 ohm (hope I remember that right) 5 watt resistors in series with the diodes. By the way, these sets are my favorites! I have one as a daily driver!
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