Kellogg (Dukane?) Tube PA Amp

Trying to find info on this one that I picked up recently. Kellogg Switchboard was a telephone company going way back to 1890's I don't know if they manufactured this or just branded it. Could be dukane...? This amp looks to be about 1959 from date codes inside. 600 ohm input with a dukane 8 pin 3A65 input transformer. 12AT7WA preamp, 5u4GB rectifier and two 5881 outputs. Can take 6L6WGB's. It's a small package but Heavy! 30 watt output. Good size transformers.

Thinking about a guitar amp conversion.