Webcor Reel-to-reel Amp Conversion

I purchased a 1950's Webcor reel-to-reel tape recorder last week ($15).  It has two units to it, the main unit and an extension speaker.  Both have tube amps in them.  I've decided to take the extension speaker and turn it in to a tube guitar amp.  Basically, I didn't want to rewire the whole thing so I thought it would be cool to leave it unmodified for the most part.

The extension speaker by itself has two 12AB5 tubes in a push-pull setup and one 12AX7 preamp tube.  I was able to hook my electric mandolin in to it and test it without modification.  The issue is that there just isn't enough gain doing it this way.  Upon further examination of the schematics, turns out there is a separate preamp in the main unit for this extension speaker.  So, the plan here is to move the preamp over to this box.  From what I've read, this amp should be about 10 watts.

The original speakers consisted of three speakers for full range.  I made a new front baffle as to not modify the original box, added a 12" speaker from an old 1970's Conn organ I stripped for parts, added a couple of component plates for input and volume.  By placing new components on the new baffle, the enclosure can be unmodified and retain its original look.

I did modify the original input plate with a new plug and a power switch.  I need yet to add a fuse block to fully protect it.


Original and unmodified:

 

The new version:

I was not able to test it by the time I powered it up (too late in the evening).  I'll try it out tonight...

The other part of the reel-to-reel I'll strip down and use the components to wire a guitar amp from scratch.  By doing this, I can add a tone stack, over drive control of the preamp, effect loop, external speaker jacks, line out, reverb, and other various options.  There are hundreds of schematics out on the internet.