| Most musical and grainless Holland Amperex 6DJ8/ECC88? | lowrider57 | 283 | 2 | |
| Mullard e188cc, e88cc or CV2492? | | 303 | 0 | |
| Mazda/RTC e88cc or e188cc? Halo getter (1960s) or dimple getter (1970s)? | | 278 | 0 | |
| Difference in sound between Siemens e88cc and e188cc? | petg60 | 1813 | 21 | |
| Mitchum or Blackburn for the Mullard 6922? | tomic601 | 901 | 28 | |
| Quantify the difference between Holland Amperex e188cc/7308 and USA Amperex 7308/e188cc? | tomic601 | 366 | 4 | |
| Which has richer tonality, the Holland e188cc or the USA 7308? | dekay | 848 | 15 | |
| How does the sound of the PCC88 and PCC189 compare to the 6922/6DJ8 and its iterations? | bdp24 | 1265 | 12 | |
| 6922 Amperex PQ White label... D or O-getter? Holland or Hicksville? | pmboyd | 1475 | 26 | |
| Need help interpreting tube code 3P3A R6J | noromance | 274 | 1 | |
| Why not put crossover networks in accessible compartments? | arion1 | 1245 | 22 | |
| How much does a Zobel network and its components affect the sound of speakers? | ieales | 2844 | 41 | |
| Acoustic Zen M2 digital vs Audience Au24 SE digital vs Wireworld Silver Starlight 8? | | 715 | 0 | |
| Black Cat Silverstar/Analysis Plus Digital Crystal comparison | | 852 | 0 | |
| Zu Event digital spdif experience? | | 491 | 0 | |
