Tube advice please...

I bought an old Knight radio set with amp and seperate tuner from thrift store for $10. Looks to from the 50's, maybe 60's, and full of tubes. Here's what I've got, what can I do with them? I have a '65 RI Fender Twin Reverb, I have 2 Orange TT's, and a couple effects w/ 12ax7 preamps. Where might these sound best, what might I expect tonewise in your application? Or should I try To build my own amp? Or should I use the point to point Knight amp for guitar somehow? Follows is a list of the tubes, all seem to be good. Also would wonder if the caps and so forth are of use. It has one HUGE cap (orange) w/ Mallory on it.
2 Mullard ECC83 12ax7's
2 GE Electronic ECL82's
2 Mullard ECL82/ 6bm8's
1 RCA
1 RCA 6hr6
1 rca 6hs6
1 Mullard 6x4
1 no name marked 6c9 and also the roman numeral III 621
2 RCA 12au7a's
1 RCA 6bn8
1 Mullard 6be6
1 RCA short and fat says 6ag11 I think.
What would happen if I loaded the TT with all Mullards? Would I def need to rebias? Thanks for any help!

 

Thanks! I will get to playing with them now. Is it true that one 12ax7 will only make a sound difference- the one in the driver's seat? If so I could pop one in each of my TT's.

 

Kids just off to bed so I have some elbow room now, I'll give both ways a go. Thanks!

 

The Mullard 12ax7's in my Tiny Terror set at 15 w thru Orange 2x12- I thought my Les Paul was Magic. Now I believe my amp is Magic as well!! Very awesome tones, seems to have added a considerable squeeze, might even be harbuoring some secret sauce. My wife wanted to clean hers(Tiny Terror) up a little bit, and the RCA 12au7's did that to a near unbelievable level. Abhorent to me, certainly, but she is my wife, so I trust her taste to an extent. She likes. Me? I think she lost considerable volume and some significant punchiness. Then again, I haven't personally played thru it yet, jury is still out. The clean is good. Not what I'm used to hearing out of this amp, which makes it weird. Previously very slight clean headroom, now with the vol and tone dimed and the gain at around 1:00 she is very clean on a previously filthy head. at 7w she may not seem as clean, I will have to see...
The significance is so great in my Tiny Terror with the old Mullards that I am going to have to give them a go in my Twin, but I cannot imagine ever finding any better in my house than I am getting thru the Orange right now. I am beginning to shudder at the thought of something happening to these tubes, as I know they would be very hard to replace. Well, thanks again, I am back at it!
-What am I saying? In my Twin with a strat and a rat- I would think "Maybe..."

 

Maybe nuthin, sounds great! Any problems switching out these tubes between the Fender and the Orange on a regular basis? Gently, of course?

 

Thank you. I thought so on the first two anyhow. I have put the 12au7a's into one of my Orange heads.

 

Why is the pulling in and out so bad? I am not forgetting that these ARE 50 years old, which I would naturally take as a significant factor, but what is the harm? I really do not even know all the fundamentals yet, let alone the ins and outs. Thanks John.

 

Thanks Johnny. I had a lot of asked tell me they would take them if I didn't want them before I discovered what they were lol. G.A.S. gets ugly sometimes. I like them a lot, and will look to get another set. Thanks again for the heads up and I'll pass it forward in the future.:AOK