What is this thing worth

I found an old MM head, I think it is an HD-150 head with 4 6l6's. Solid state preamp w/ no 12ax7's. Has phasor & reverb. Its owned by a church I used to attend, and has been in storage for the last 3 years or so. I used to use it for praise and worship and it sounded good. It also has the mm 212 cab but no speakers. The tolex and hardware are in medium condition. I attempted to buy this head and cab back in 2002 but it was not available then but their story has changed now and they are asking for an offer. I dont really know what it is worth. I would like to purchase this head and add an input to the power section to use with my Rockmaster preamp. Any help would be great.

325.00