The Bel's are still on my radar.
However, I wanted to share this experience.
My Mullard's 7308/E188CC ~ Cryogenic .....which are burned in....I have one in my ARC right now and Ediswan's for inputs of my ZMA.....total heaven! Lowered noise floor, decay to die for and timbre....better bass. NOS Platinum tubes are worth every penny. YMMV, without the Cabling to discern the difference...... . The torture of one week of the eletro-harmonix I had in the ARC Line Stage is over!
Telefunken's are a must for me as inverter's.
https://www.upscaleaudio.com/collections/vacuum-tubes/products/telefunken-e88cc-...........glad I got them when they were much cheaper for Platinum.
The Mullard(s) I have Platinum Cryo'd (two matched pair).
https://www.upscaleaudio.com/collections/vacuum-tubes/products/mullard-e188cc-73...Yes, I'm out of the NT-503 business for now.
Listening Room:
Room Treatments from Michael Green & Home Brew
Sony as Transport (DVP-NS57P)
Illuminati D-60 Digital Coax IC
Shunyata Research Zitron Alpha Digital Power Cord to ZDSD
{Significant}
Decware ZDSD DAC / Recorder ++
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W/Steve's Output Transformer's/kicking to the Curb quite a few superb DAC'S
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(@ -20 Ref Level, 0.0 Input volume and @ 16/192)
WBT RCA Kimber Select KS1030 ~.5 meter
Audio Research LS-2B MKII Line Stage w/remote
Mullard 7308/E188CC ~ Cryogenic
WBT-0102Ag RCA Kimber Select KS1030 ~.75 meter
Decware Zen Mystery Amplifier.....Ediswan's in Inputs right now
~BIASED at *56* mA~
NOS/Platinum/Mullard E188CC/7308's in my A12 an B12 Input positions Cryogenic~NOS/Platinum/Telefunken E88CC for Inverter Tubes~NOS RCA 0A3's & matched Quad/Tung-Sol KT66's
ZMA adjusted at 20% to 30-40% max ~ from 0 Gain ~ w/ZDSD
ZMA adjusted at about 80-90%, or 100% gain ~ w/ARC Line Stage ~ volume via Remote Control
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Kimber Select KS6063 Speaker Cable 8ft WBT-0681-Ag Spades
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Kimber 8TC new/white & clear jacket/to remind me of how fluid/timbre correct and good the KS6063 are
Acoustic Zen Adagio - Black Pearl (Modified)
.....enjoying from 8 ohm ZMA Taps
~~OR~~
Decware DM947 Monoliths/4 ohm (Midrange modification/Wave Guide)
w/PX Clarity Caps
Kimber Silver (AG) Jumper's to Tweeter's
.....enjoying from 8 ohm ZMA Taps
Caintuck Audio Eminence Alpha 15" OB BASS Unit
at 53Hz, with my Velodyne CHT 130 watt plate amp and 0 degree phase.....at 1/4 volume on plate
Plate Amp....regen'd clean ~ plugged into P3
Acoustic Zen Adagio's x-over's Modified/Full Range with Mundorf MCap Supremes-single Cap to each Tweeter/4.5k cross
(Gutted: 3kHz/18dB/Octave, Linkwitz/Riley Crossovers....with all crappy parts = gone)
XLO Pro Power Cord to ZMA
PS Audio P3 Power Plant / Pangea AC-9SE from wall to P3
(Transport, ARC Line Stage and ZDSD, Regenerated/*120*~ Multiwave off...ZMA on High Current Output).
++ ZDSD DAC, kicked to the Curb: Auralic Vega, PS Audio PWT & PWD, PS Audio Direct Stream DAC, Chord Qute, NAD M51 (twice) & Schiit Yggdrasil.
~NOS Platinum Tubes from Upscale Audio/Kevin:
(Great Britain) Mullard 7308/E188CC ~ 2 pair (both pair Cryogenic)
(Germany) Telefunken E88CC ~ 1 pair (painfully expensive/worth it)
(US/Great Britain) Ediswan CV2492/6922 ~ 2 pair (one pair Cryogenic)
(Hungary) Tungsram 6922/E88CC ~ 1 pair
(Hungary) Tungsram PCC88/7DJ8 ~ 1 pair.
From Cryoset:
(Russia) 6N23N/P-EB ~ 2 pair
(Russia) 6N23P's ~ 2 pair/came with ZMA.