The value of the amp has nothing to do with what parts cost.
If you can get another bandit 65 for 50 bucks, buy it and use it for parts.  You probably won't find an adequate transformer for that price.
Sorry if that sounds harsh, but that is the reality of parts costs.

You need a power transformer that puts out 60V center-tapped (30-0-30) good for at least 120VA.  If it's not the exact peavey unit, you will have to drill and cut to make it physically fit the chassis.

If R9 is not connected to ground and/or Q2, you will probably get 24V at Q3 drain. also Q3 could be fried and sending its drain voltage back into Q2's drain.

I measured voltages both at the transistor and at the dropping resistors.  The pinout of the new transistor is different than the original and I made sure it was installed correctly.  I confirmed resistances on the transistors but will report the values here later today.

Q2 is not conducting any current. Were Voltages measured on the resistors or directly on Q2's pins ? Verify that the Source of Q2 is connected to R9 and that the Drain is connected to R8. Did you install Q2 facing the correct direction ? Did you Ohm-check Q2 before installing ? Did you Ohm-check the bad Q2 ?

Yeah, expensive. Looking to do this on the cheap. Makes no sense to add a hundred dollar part to a 50 dollar amp.

Since you already replaced Q2, next suspects would be C7 or Q3.

Hi, Recently I was given an old peavey bandit 65 amp with issues. I replaced the old electrolytics and in the process some solder dripped across the board bridging some traces. I turned the amp on not knowing and fried the transformer as a result. I need a replacement transformer but am having a hard time finding one thats not bloody expensive. What criteria needs to be met when looking for a new transformer? Can I buy not peavey branded, generic? The part number for the fried part is 70518713.
Thanks

Thanks for the tip.

The link you posted is not working.  Try to attach your picture directly.  When you respond to this post, click the 'preview' button and you will see the option to attach a file.