TriodeLuvr wrote: ↑Thu 04/22/21 9:43 pm
zaphod_phil wrote: ↑Thu 04/22/21 2:35 pm
Yes, the signal path becomes different when you insert a reverb stage
The reverb stage in mine isn't inserted, it's in parallel with signal path resistance already present. When the pots are at minimum, it's electrically non-existent.
Jack
That's essentially the idea with mine as well. With the reverb pot off, the PI cap is grounded as it would be in an 18W style single-channel amp. Since that's a known, the difference in sounds for Bieworm's amps, are obviously the different components/cabs/speakers being used.
TriodeLuvr wrote: ↑Thu 04/22/21 9:56 pm
JMPGuitars wrote: ↑Thu 04/22/21 7:34 pm
The EF86 18Watter is awesome, and it still has the Marshall sound, but also touches on the Vox sound.
I'm a BIG fan of the EF86, but I'm surprised by its following for musical instrument amps. It's one of the lowest distortion small-signal pentodes ever made. Perhaps it's tendency toward microphonics at mV signal levels is a contributor to the unique sound.
Jack
The EF86 can produce very nice distortion in the preamp, but the tendency is to find the lowest microphonic samples of the tube. If you take a look at the sample of my "EF86 Xtra" circuit, it's actually fairly high gain (with a parallel 12AX7 following it). That said, I may want to try building a HiFi version with them eventually, I know they're quite popular for that.
Thanks,
Josh