This is a '68 Sunn Sonic l 50 watt tube amp Great working condition.Looks like she had some prior work done before we got her.  One tube socket was replaced, not sure but one of the transformer may not be original!We checked all tubes replaced one 12ax7 with a 7025, also she has 2 6L6's not EL34's. Voltages are good and set the bias! I was told by my tech that these amps are wire from the factory to use either El 34's or 6L6'sWe replaced the 2 prong power cable with a grounded 3 prong cable!