#1
I am thinking of getting some new tubes for my amp. I'm going go with SED winged c for power tubes, but was looking at NOS for preamp tubes.

My question is, what do all the differences mean?
Short plate, long plate.
gray plate, black plate, triple mica plate.
Smooth plate, ribbed plate.
What are the differences between these things?

How important is the FX loop tube when it comes tone?
#2
FX loop tube is almost always there as a driver, probably little to no effect on tone. i would not invest in an expensive tube there.
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#3
It is always good to have 1-2 NOS JAN-Phillips/GE 5751 and they are cheap for NOS tubes at $30-$35
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#5
Quote by ikey_
FX loop tube is almost always there as a driver, probably little to no effect on tone. i would not invest in an expensive tube there.


Well... it depends, some circuits like the MkV have the FX Loop being shared with one of the channel's gain stage... so just 2x check your circuit first. If not just get a military-spec'ed tube and slap it in there. Do the same for the phase inverter. With rugged tubes, you can completely forget about ever needing to change these 2.

I think short-plate tubes are higher gain, whereas for a similar tube with long-plate you'd get lower gain. Not completely sure about this though.
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#6
"almost always" i guess.

long plate tubes can sound really good, but generally are not good in V1 for combos as they are higher prone to microphonics and they are also not good in cathode folower stages. im no expert, but cathode follower stages can very well be the EQ or loop stages of an amp. it is based on your amps design.

if you have a common brand or model of amp, google it, some techie probably posted something.

long plates have a higher current or something? not really sure exactly but there is a design difference. this higher current makes some of them like a sovtek LPS for the last phase inverter stage.

i prefer 12at7 in the phase inverter. very easy to find NOS JAN PHILLIPS 12a7s, about 15 bucks.
Carvin CT624
Walden G630ce Acoustic
Carvin V3M, Avatar 2x12 WGS Reaper, vet 30
(crybaby, Fairfield circuitry Comp, GFS tuner, Vick Audio 73 Ram's Head, Xotic AC booster, lovepedal trem, TC Flashback, PGS Trinity Reverb, Walrus Audio Aetos power)