All amps even 33 are major difference. The 5 is the warmest the rest are more neutral. The BottleHead can get closer in any direction. The 33 with same type tubes always keeps more solid effect. Pendant stays more ss with tube magic. ZMF I like most on BottleHead and WA5. WA33 is the powerhouse but eats your wallet for buying power tubes. The Pendant I have a bunch of tubes but not really any change other than gain. The WA33 did have change but always kept warmth under control satisfying both camps but find it more of a critical amp due to balanced design. The 5 you can swing ss with KR tubes to warm with eml if neutral is choice add Takasuki instead. Only reason moved away from 33 was I didn’t enjoy majority of headphones. Found many headphones needed bloom to enjoy them. All amps are tube holographic. My favorite tube on the 33 was 300b 2.5 solid plate. The WA5 favorite tube Takasuki 300b. The Pendant PSvane EL84 Psvane. The Pendant RCA 6as7g Victor hard to get I was lucky on eBay.This looks really good i think what is worth noting in this setup is that all tubes are new production. I have had some EML tubes and shuagung cv181 and they are really at NOS level.
How would You compare wa5le to zmf pendant and bottlehead crack (i see You own them). I know these are very different amps but still would be interesting to know (at least briefly) how they compare in terms of details/soundstage/warmth.
It’s tough to have one I don’t believe one is enough.