[FloridaBoy]

Originally Posted by Musica Amantem

In my rig:

Inspire KT-88 SET amp with 20 Watt trannies and DACT step attenuator; LP-27a Inspire preamp with DACT Step attenuator; Yggdrasil DAC; Tekton Lore 2.0; Velodyne DLS 3500 R Subwoofer

Preferred combinations:

No. 1 (Best sound):

Decware Zbit (Balanced; No preamp);

Amp:
Super Radiotron 6SN7 GTA; Sophia Electric 274-B Mesh Plate; Russian 6P3S-E

No. 2:

Preamp:
GE 6BX7 GT, RCA Radiotron 80, Silvertone RCA 27*

Amp;
Super Radiotron 6SN7 GTA; Sophia Elecric 274-B Mesh Plate ; Russian 6P3S-E

No. 3

Preamp:
GE 6BX7 GT; RCA Radiotron 80; Silvertone RCA 27*

Amp:
Super Radiotron 6SN7 GTA; Sophia Electric 274-B Mesh Plate; Genalex GL KT88

No. 4

Preamp:
GE 6BX7 GT; RCA Radiotron 80; Silvertone RCA 27*

Amp:
Phillips JAN 6SL7 WGT; Sylvania 80 (Green); RCA 6V6 G ST

*Most of the time, the Silvertone Balloon-type RCA 56's in lieu of the equivalent 27's, produce the same results!

YMMV

Just for your reference, these are all the tube candidates at hand:

NOS Russian 6P3S-E
NOS RCA 6V6 G ST
NOS RCA 6V6 GT
NOS TungSol 6AR6WA w/Adptr
GENALEX Gold Lion KT-88
NOS Philco Globe-Type 27
NOS Philco 27
NOS RCA 27
NOS Sylvertone Globe-Type 56
NOS RCA-Radiotron 56
NOS Silvertone RCA 27
TungSol 6V6 GT

Sophia Electric 274-B, Octal
NOS RCA Radiotron 80
NOS Sylvania 80
NOS RCA Victor 80
NOS RCA Cunningham 80
NOS JAN Sylvania 80
NOS RAD-TEL 5Z3 (4-Pin)
NOS RCA 5Z3 (4-Pin)
NOS Brimar 5Z4 GY (Octal)
NOS Westinghouse-Holland 5AR4

NOS RCA 6SN7 GT
NOS Sylvania 6SN7 G/B
NOS Sylvania 6SN7 GTA
NOS Super Radiotron 6SN7 GTA
NOS GE 6SL7 GT
Tung-Sol 6SL7 GT
NOS Sylvania 6SL7 GT
NOS Phillips JAN 6SL7 WGT
NOS Tung-Sol 6SL7 GT
NOS GE 6BX7 GT (Preamp)
NOS JAN Phillips 5691
NOS 6N8PJ (Chinese)

You should get another quad of the 6P3S-E. That appears to be your favorite power tube. The good ones are getting hard to come by.