[Ron Ramirez]

Greg

Everyone is welcome here at the Philco Phorum, whether they are an experienced collector/restorer or a "newbie."

I suggest you take a look at this page here in the Phorum:
http://www.philcoradio.com/phorum/showth...?tid=14958

and then look at the pages intended for beginners at Phil Nelson's website:
http://www.antiqueradio.org/begin.htm

The original Philco service literature includes a drawing of the underneath of the 91 chassis showing where the various parts are located. You can obtain this service information, at a reasonable cost, from Chuck Schwark at the Philco Repair Bench website.
http://www.philcorepairbench.com/schematics.htm

There are plenty of folks here willing to help you. Terry (Radioroslyn) is sort of our unofficial official resident technician, and I am sure he will chime in with help if you ask. Many other folks here will also offer help and advice, and some have done so already.

Oh, and to answer your question about the chassis - yes, it must be removed for service. Not too difficult - remove the four knobs, they should pull off although sometimes they become stuck from decades of corrosion. If you find you have a stuck knob, just ask and someone will offer some suggestions on removing it.

Once the knobs are off, there are four bolts under the radio that hold the chassis inside the cabinet. Remove these bolts, and the chassis will slide out from the back. You will have to remove the speaker at the same time since it is hardwired to the chassis (no connector plug & jack as used on some Philco models). The speaker is held with four nuts in back.

Good luck, and have fun! Yes, you can learn how to service it yourself, if you are patient, willing to learn, and do not take any shortcuts.