New 4-4-0 and Asteroid 60 amp porn

[Tillydog]

To add to what I posted above, the attached shows how the PI balances under clean & clipped conditions for 'stock' and various split load resistors. The combination I posted above is one where the balance doesn't vary much between clean & over-driven. The last one might be worth a try if more drive is desired. (Note the input signal is from further back in my amp model, not the PI input.)

Andy

[passfan]

Having had a chance to play around with these changes using 12ax7's I must say these changes have produced a much more useable circuit. I am able to vary between clean and driven with no noticeable volume drops and have a bit of chime in my clean tones. It is much more subtle than a full on Express but it is there none the less. I've still yet to make the pot changes but I see no reason to not make that change as well. Thanks to Tillydog for the spice simulations.

[Tillydog]

No worries

Did you pick up that the grid leaks (and grid stoppers) on the 6SN7 had gone up to 220k, too?

You could try the values at the right of the table, too..... (hint)

Andy

[passfan]

No worries

Did you pick up that the grid leaks (and grid stoppers) on the 6SN7 had gone up to 220k, too?

You could try the values at the right of the table, too..... (hint)

Andy

Yes, those I caught. Initially the tube on your schematic was unlabled and I assumed had not changed. I am playing a Les Paul with burstbuckers and have plenty of "hair". I might just leave it as is until my plate clears up enough to experiment.

[Tillydog]

Initially the tube on your schematic was unlabelled and I assumed had not changed....

A fair assumption! My fault for not making it clear until after the event .

I've been happy enough with the above values not to be motivated to start tweaking again.

Enjoy

Andy

[RJ Guitars]

Great thread(s)... I really like both of these builds and I think they are both worthy of a dedicated thread.... any chance of breaking the Asteroid off onto a separate thread? The bulk of the discussion so far is on the 4-4-0 and I didn't want to confuse matters by throwing in my comments on the Asteroid build.

Nice work!

rj

[passfan]

Great idea RJ...thread coming.