Here’s a quad of Western Electric 300B in the Grand Cayman. Just something i am trying while waiting on the first batch of finished enclosures to arrive (the power transformers just got here by boat)
how does it compare with 20B? So far, here are some bullet points
- Surprisingly low noise. This is with dc heaters. The blue hawaii, or Grand Cayman with 20B or 300B all have about the same noise floor, using decent tubes.
- The gain is a bit low. About 375x with WE 300B, 425x with EHX, and the EML 20B version is about 700x. [note: i havent tried changing any feedback setting yet]
for comparison most Stax amps are between 500x and 1000x gain
the lower gain could work out great if adding a preamp in front of the amp, but for a quick increase to 1000x gain simply replace the input tube 6SN7/12SN7 with a higher gain 6SL7/12SL7
As one would expect, distortion is higher. About .1 to .2% under load, or about 10x as high as the 20B
which one sounds better is likely going to be very subjective and will have to wait until i get a 2nd one put together for proper A/B comparisons