Preamp out power amp in question

[ShoemanGB]

I just got a late '80's Peavey Solo Bandit 112 and I'm wondering if it's ok to insert a plug in the power amp in jack to silence the amp.  As designed the preamp out jack does not disconnect the power amp input and I'd like to be able to use just the preamp at times.  Snip attached of the jack arrangement.  I did try a plug in there and it did silence the amp but I'm not sure if it's safe to do as far as damaging the output section goes.

[shooter]

Snip attached

I need some more snip to be sure, like the stage before and the stage after the postage stamp

[ShoemanGB]

Does this help?

[sluckey]

...I'm wondering if it's ok to insert a plug in the power amp in jack to silence the amp...

yes

[PRR]

I would use a shorted plug, or even a piece of 1/4" copper tube rounded-over with a file. Just leaving the input to a power amp unconnected lets all the crap and radio in the room get in.

Except a 1/4" short around guitar amps just begs to get put in a Speaker Out jack (boom, maybe).

You could re-jigger the PowIn jack to default to 'short', then use a 3-inch jumper to connect Pre to Pow for normal use. Of course you will lose the jumper (tether?) or forget you need it and beat the 'dead' beast trying to make sound. 'Flat' right angle plugs if possible- stick-out plugs will bend the panel or shatter the PCB when it falls on its back.

[ShoemanGB]

Thanks for the replies everybody. I could certainly make a shorted pancake plug.  As the jacks are the plastic housing type soldered to the PCB I'll leave them as is.
 For once I'm trying not to mod something that is perfectly functional as is.  Adulting is fun!
I gotta add that I have not played anything with 80ish watts in decades and man, in my small music room that Peavey moves some air!  This afternoon I disassembled it, put the DeOxit to the hinky pots, did the same to all the jacks, vacuumed the cab interior and grille cloth, removed the reverb tank and cleaned it's dusty naugahyde sleeve, and used simple green and a brush on the tolex not tolex and put it all back together.  It looks brand new now.  The board and components are in great shape. 4 TI 4558's with silver tops lurking in sockets.  I swapped the first one in the circuitry for a new TL072 I had as that's a quieter part but it was not noisy to begin with and I can't really hear an less noise now.  No harm done I'll leave if for now. Made in Meridian, very cool!  Hartley Peavey is a smart man. I'm impressed with this rig.