Retubing dilemma


I have a melody el34 integrated amp.  As I mentioned in a older thread one of the tube store el34 preferred series tubes went up in flames. So now I have a choice and I want to see what people think would make the most difference sonically. I would like to keep this under  $200. 1.  I currently have 2 northern electric 6Sn7 tubes and 2 shuguang treasures 6sn7 tubes, 1 of each type on each side.  Should I replace the northern electrics with shuguangs so I have a full set all the same and just replace the el34 with the same preferred series or
2. Replace the el34s with gold lion kt77 that seem to be very well liked. 3. Other suggestions. 
As an aside if I went with #1 should I move the old shuguangs to one side and put the new pair on one side. 
Thanks 
128x128jkontuly
@strateahed Great link. It seemed from what others said that this tube won't substitute? (Or maybe needs to be checked?)

In the link you provided, I liked this paragraph:
"1st Place (tie):  Genalex Gold Lion KT77   ($49.95 each. All prices in USD) Essentially, a perfect tube. Quiet and unfussy. It works with every musical genre. The sound quality is right up there with the Shuguang black bottles but this comes at half the price. This tube does it all–huge reserves of power and headroom, a massive airy soundstage but in this case airiness is not a sign of thinness or an unsaturated midrange. For hard rock and complex orchestral music, here’s your tube. It’s no slouch with jazz but tone freaks seeking an even more saturated midrange might prefer the Mullards or the Tung-Sols. Highs are unusually detailed and well defined but never glassy or edgy. This tube excels in scraping up micro details. The bass is deep and dry, not quite as punchy and elastic and ripe as the SED Winged C or the Tung Sol EL34B, but bone dry. There is a touch of warmth but this tube is not a tone freak’s dream. It’s more neutral. This is the only serious challenger to Shuguang and Psvane’s best offerings, and again, it’s half the price. My vote for the King of the EL34-family."
Aren’t Red Ruby, Shuguang rebranded? I’m telling you the Red Ruby is a true KT77 killer.. 1/2 the price and every bit the quality. Never had a flame out yet.. LOL. They will scare the crap out of ya.. LOL I had a cable drop, that caused a tube failure.. LOL dog was barkin’ rabbit was jumpin’, wife was screemin’. I was laughin’. Still brings a smile to my face.. 15K cable drop..The words I said that day.... Every commandment, less killing...was broken.. I say that with great reverence.

Regards
@oldhvymec

if you are talking about ruby tubes... https://www.dougstubes.com/brands/ruby-tubes.html

ruby is a rebrander, and sources their tubes from russia, china (shuguang) and slovakia (jj tubes - using former tesla tube making tooling from the former czech republic) -- latest info from them here... ------------->

https://shop.magicparts.com/?fbclid=IwAR3eolepHSTM_IdtcZ_ynt1hV7dwlyjuMDoLiDxoVAW4fAB25qBugv4gfBg
Post removed