HI John, can I use a current limiter to turn on a princeton reverb that I blackfaced with all tubes in including the 5u4gb rectifier tube? I put a standby switch on then took it off because the first filter cap was going over 500 volts. If the amp had a working standby switch I wouldn't be worried about turning the power switch on but with no standby I don't want to do it unless I know that the amp will be alright. Also can I use a 5u4gb Webber copper cap in this amp with no standby switch? Thanks.