Belles 21A upgrade

Mundorf M-caps gold of V-caps TFTN's. I'm not sure what it
means but here the specs are better than Auricaps and exceed their sound quality

I haven't rolled the tubes yet since I hear the unit comes with Mullards. Which tubes are better 5814A or 12AU7? Any recommendations for the system listed below will be welcomed:

21A Belles tube Pre
Belles 150A Ref
Rega Apollo
MI2 Biwire Goertz
AQ Columbia IC
Vandersteen 2 Ce Sig II

Thanks,
Wig

Do you have a source where I can order these tubes? Man too many choices?

Wig

I have a pair of Phillips Jan 5418A never used, are they better than the stock Mullards if the unit comes with Mullards?

Wig

I opened up my 21A last night and found out their not Mullards but GE6189/12AU7A. Are these any good!

Wig

How good are these tubes?

you have a solid state amp, so a warmer 12AU7 might be preferred

best in order
all are nice, smooth high end 12AU7's

2 low noise pairs) ECC82 Mullard branded Philips NOS 1964-1969 in Philips boxes (recommended)
1 pair $160) 11.8/12.2 and 11.4/11.6ma 1967 and 1969
1 pair $160) 11/11.8 and 11/11.2ma 1964 and 1966

1 platinum low noise pair $150) CV4003=12AU7WA Brimar NOS in original boxes 1974-1975 1-5% matching, boxes moisture damaged
1 tube) 12.2/12.5ma 1974
1 tube) 12.5/12.7ma 1975

Low Noise Platinum Pairs $125/pair) CV4003=M8136=12AU7 Mullard "Box Plates" NOS copper grid posts 1982-1985 most in original boxes

a 5814A could be used as a sub

1 platinum low noise pair $150) JRC-5814A RCA black plates double mica 1962-1965 original boxes (best pair)<-------
1 tube) 12/12.1ma
1 tube) 12.2/12.4ma

Thanks,
Wig

So I can buy GE BP in 12AU7 and 5814A or the GE BP are only in 5814A?

Thanks,
Wig

Can't find anyone that sells GE BP 5814A, how does the $200 a pair 1956 RCA 5814A Triple Mica compare?

Wig