Welcome to the site, @Reel Bond. Glad you found us.
I will say it..., "DO NOT TRADE!" that is a bad deal.
PT-2400 amps are pro amps, while it has similar performance characteristics as a TFM-75, unless it was fully restored including a re-finished faceplate, it's going to show years of hard knocks being on the road with a band..., Some "like" the look of a PT-2400, but for me, the TFM-75 is far more sexy-looking in my stack in my listening room..., never mind the WAF (wife acceptance factor).
If you are itching to lose one of the TFM-75's to know what true loss and grief feel like, send one to me 😉 ..., you will regret it.
The TFM-75 amps sell on the low-end for $2000 (and that's a RARE FIND). Typically, they are going for $3000 - $5000 as I look back at my resale notes. The PT-2400 with its utilitarian look and function as a pro-band-amp, rarely go for more than $1500, in mint restored condition, maybe $2000. Beat up and not-working condition, only a few hundred bucks.
Post a picture of your TFM-75 amps..., we'd love to see what you have!