finebyfine

From my stash: MPS6530 measured HFE = 75 @ Ic = 5.8mA 2N4123 measured HFE = 59 @ Ic = 5.9mA 2N6517 measured HFE = 73 @ Ic = 0.68mA...

It's a really cool take on the Harmonic Percolator. I traced it from some photos, which isn't generally the best practice, but what I...

Seriously though, I'm just visually inspecting those caps and assuming they're unchanged... and that means nothing really. I won't...

Not exactly on the bench right now, but in the vicinity.

Oleg is the man. That's a great chart! Saving that to my desktop. :) Last time I checked he didn't have as much to offer in NPN's...

I've been mostly picking them up every once in a while from Oleg (sovcom) on eBay. I've got some MN20/MN20a packages coming next. I...

This looks pretty cool......anyone try it yet?

Oh.. there's Peavey pedal with Transtube technology.... Dirty Dog. Schematic is available somewhere. And something to read about...

I don’t have a link handy because I’m on my phone but I know there is a lot of documentation about Peavey’s methods of emulating tube...

Johnny thanks a lot for your suggestions. I think that before modding the Astrosim I'm going to try Bajaman's Reactor in between the...

Ya still can, schems are available online. I have breadboarded all three, with good results.

I was looking forward to building it really, but thanks for that info 😉

FWIW, there are a few commercial amps that feature specific emulations of tube poweramp dynamics: - The Traynor DG60 and DG65 have an...

Thank you for posting this! I just came to the realization that I should be taking this measurement and this will save me some money by...

Here's an updated schematic. I'd like to think I'm getting close to a prototype fabrication run. Changes from the previous schematic...