Loud 60 cycle Hum from tube amp.

[alexg]

Originally posted by Brenden
Alright, I figure since my first question is answered I should be able to hijack my own thread, right?

So I sorted through the tubes and picked out the icky looking ones and here's what I have left:

RCA 5651A:1
National 6AU6A:1
GE 12B4A:2
RCA 12AU7A/ECC82: 1 National:2
Amperex ECC88:1
RCA 6U8A/6KD8: 3
GE 6C4:1
RCA 6AQ5A:1
RCA 35W4:1
RCA 6AkS:1
National Union 55L6GT/C:1
6AL5:1
Westinghouse 6CB6:2
GE 6AU6:1 Motorola:3
GE 6DJ8:1
6BC5:1
Motorola 544GB:1
RCA 6X5GT:1
12SN7GTA:2
12SN7GT:1
Raytheon 6SL7GT:1
RCA 6186:1
GE 6J6:2
Westinghouse 6AV6:1
Raytheon 6AH6-V:1
RCA 12AU7A:2
Westinghouse 12AX7:1

Are any of these sellable? Any of them usefull?
And after googling around for a while I've had trouble finding info about these transformers on the internet other than "model #XXXXXXX transformer" in some nook in the interwebs. Are there any websites that I could find usefull for identifying them? And what could you possibly need a 2100V .74uf Cap for?

I have done nice sounding preamp/linestage using 12b4, 12sn7 and 12au7, mostly using 6x5GT rectifiers. (you can build a few preamps with your tubes).