10W SLO CLONE

[airguitarist]

Do you find any issues with low end? The hammond OPT - primary inductance 5.6H seams very low for the Ra-a of EL91 in push pull?

[TIMBO]

Do you find any issues with low end? The hammond OPT - primary inductance 5.6H seams very low for the Ra-a of EL91 in push pull?

Hey mate, I'm actually using a 100v line transformer as my OT.
The specs are 30Hz-20KHz +-3dB.
Seems to work well.

In the original SLO100, the normal channel is not disconnected when the OD is engaged. Both channels are mixed together before the final gain stage before fx send.

Normally, the OD will dominate the normal channel, but if you set OD gain very low, bleed through seems likely.

Since it’s tubes and high amplitudes, some capacitive coupling between channels can happen. Muting and/or disconnecting the unused channel is a good idea.

With a bit research this seems to be a part of the amps MOJO 
So I'll do some rewiring and see what I get.

[nandrewjackson]

Great looking build ! Sound clips are nice, too !


But I just have to chime in here about the SLO circuit.  So beware, opinions are about fly !


Caveat: I have not played through, or even heard a genuine SLO in person.


I have, however,  OWNED a mesa rectifier,  which is VERY similar to the SLO hi gain channel. 


And, I have built several SLO/rectifier circuits.


And, TO ME, the rectifier/SLO sound is a mess.


BUT, I've found through building the circuit, and schematic research,  it can be made better.


The flab low end you mentioned,  I agree. Yuck. Try, if you have the time/inspiration,  changing the coupling  caps to something like 0.004uF. In your circuit,  that would be the 0.02uF caps you have at V1 pin6, V2 pin6, and V2 pin1.


Also, the 1M to ground at V2 pin 2 can be lowered to about 100K. The channel will lose a lot of noise, and gain tons of clarity.


Check out some of Bogners high gain schematics,  and have a look at the Vai carvin legacy schematic. 


I'm not judging your build, the sound clips I listened to on my phone, they sound fine, considering I'm hearing them on a Samsung Galaxy  :-)