![[-]](https://theultimatetone.com/images/collapse.png "[-]")
04-28-2023, 06:59 PM
Hi Guys
An alternative to the see-saw splitter is the concertina. Just wire the splitter as self-bias and there is still the free-running stage ahead of it. The concertina output is slightly asymmetric and warmer than with a Schmitt, so this is as "conventional" as you might want to update the splitter
Most harmonica amps work best with lower-mu tubes - the 12AY7 is a common sub into Fender amps, reducing two stages from mu=100 to mu=50. 12AT7 is in between at mu=70. As TUTs state, low-mu tubes sound mellower than high-mu tubes. A harmonica has pretty high and steady output, akin to a signal generator plugged into the amp, so the milder tone of these tubes works to remove some of the harshness of the instrument.
You can also use an asymmetric output stage with dissimilar tubes. If you find the concertina has less fatness than the pre-see-saw 2-stage style, this output tube mix might compensate for it.
An alternative to the see-saw splitter is the concertina. Just wire the splitter as self-bias and there is still the free-running stage ahead of it. The concertina output is slightly asymmetric and warmer than with a Schmitt, so this is as "conventional" as you might want to update the splitter
Most harmonica amps work best with lower-mu tubes - the 12AY7 is a common sub into Fender amps, reducing two stages from mu=100 to mu=50. 12AT7 is in between at mu=70. As TUTs state, low-mu tubes sound mellower than high-mu tubes. A harmonica has pretty high and steady output, akin to a signal generator plugged into the amp, so the milder tone of these tubes works to remove some of the harshness of the instrument.
You can also use an asymmetric output stage with dissimilar tubes. If you find the concertina has less fatness than the pre-see-saw 2-stage style, this output tube mix might compensate for it.
