Tung-Sol EL-34B vs Genalex Gold Lion KT77 for Cayin A100T Integrated Tube Amplifier

Hello,

I recently got a new set of Speakers and an Integrated Tube Amplifier. 

The amp was a used unit and came with stock Cayin tubes (probably 100 hours on them). I guess these Cayins could be any Chinese re-rebranded tubes.

Overall the sound is good but I found the top end to be a little edgy and bright with my system. Therefore, I've been looking into replace these with a new set of tubes.

In the past, I have tried EL34 Mullards, EL34 Electro Harmonix and EL34B Tung Sol. The Mullards have good bass but sounded dull in my system and lacked some detail. The Tung Sols sounded the best.

Now, I've read the Genalex Gold Lion KT77 are also very good, with extreme top end detail and neutral sound.

Ideally, I am looking for power tubes that can extract subtle nuances and detail from recording while still being warm and mellow at the top end, without been harsh or bright; perhaps a hard to find combination?

The Genalex Gold Lion are twice the price of the EL34B Tung Sols. Although, it will cost me a third of what I paid for the amp to replace the 8 tubes, I might go for it if they are much better than the Tung Sol and I get the sound am aiming for.

I might also need to look into the pre-amp tube section. As far as I know, the tubes which will affect the sound quality on this particular amp, are the power tubes (EL 34s) and the pair of (12 AU7s) pre-amp tubes. 

The single (12 AX7) and pair of (6CG7s) are for control only. So I should focus on the power tubes and the pair of 12 AU7s.

The Cayin A100T has the following tube set:

Power Tubes

Eight EL-34 

Pre-Amp Tubes

One 12Ax7

Two 12AU7

Two 6CG7

-Is the Genalex Gold Lion KT77 considered bright and clinical sounding?

-Which pre-amp tubes (12 AU7) should I look into, for a real sound quality improvement?

-Finally, should I care about matching pairs and quads if the amp offers independent bias adjustment on each tube?

Please let me know, your advice will be appreciated,

Thanks,

J

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My system:

Rotel RCD 1570 CD player

Sonus Faber Venere 3.0 speakers

Cayin A100T Integrated Tube Amplifier