Reddit mentions of JJ Electronics Amplifier Tube (T-EL84-JJ-MP)

First things first, if it were me I would just buy it right off the bat. That said...

1. Reverb tank should be simple pimple. Unless it's some odd setup(which I doubt it is), it would usually be a RCA jack type plug and play. Accutronics has always been my favorite replacement reverb tanks.
   
   
2. Tubes wouldn't be expensive to mess with if you wanted to try others out. I would see what ones they had in there and then just order a couple different brands to see what sounds best to you. A couple [JJ preamp tubes] (https://www.amazon.com/JJ-Electronics-T-12AX7-S-JJ-Electric-Amplifier/dp/B0002M728Y/ref=sr_1_1?ie=UTF8&qid=1541011028&sr=8-1&keywords=jj+12ax7) and [a matched set of EL84 JJ power tubes] (https://www.amazon.com/JJ-Electronics-Amplifier-Tube-T-EL84-JJ-MP/dp/B003FO89CE/ref=sr_1_1?ie=UTF8&qid=1541010458&sr=8-1&keywords=jj+el84+matched+pair) are really cheap and tend to be built well from the years I've been buying them for. I'm thinking only the first two preamp tubes would have anything to do with the tone section as the third one (furthest small tube to the left when looking at the back) could just be the phase inverter and also driving the reverb. I'd have to loom through a schematic first to actually know for sure, though.
   
   
3. Price would be good to me as it's half off new and I'm a cheap bastard that can attempt to fix things if I need to. If it sounds good to you in just replacing a reverb tank and trying out different tubes, tear it up.
   
   I had no idea of these cheap guys being around and may end up getting the little 5w version for fun around home. How cool.

This has all 5 of them:

http://www.amazon.com/dp/B00AOA6FXC/ref=pd_lpo_sbs_dp_ss_2/188-6137407-2567854?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=lpo-top-stripe-1&pf_rd_r=0915A8DDT6FXC2YQEM8N&pf_rd_t=201&pf_rd_p=1944687562&pf_rd_i=B00VVNIIVS

This is just the power amp section:
http://www.amazon.com/dp/B003FO89CE/ref=pd_lpo_sbs_dp_ss_1/188-6137407-2567854?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=lpo-top-stripe-1&pf_rd_r=0915A8DDT6FXC2YQEM8N&pf_rd_t=201&pf_rd_p=1944687562&pf_rd_i=B00VVNIIVS

And this is just the pre-amp section:
http://www.amazon.com/dp/B005F5TP6U/ref=pd_lpo_sbs_dp_ss_3/188-6137407-2567854?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=lpo-top-stripe-1&pf_rd_r=0915A8DDT6FXC2YQEM8N&pf_rd_t=201&pf_rd_p=1944687562&pf_rd_i=B00VVNIIVS


You could also google something like "VOX AC15 tube replacement kit" to compare brands and prices for the whole set of them.