Bluesing a D'Lite

[greiswig]

So...if I were to change to the Bluesmaster PI on a D'Lite with an 8k OT and running 6L6's, would I be changing everything before *and* after the splitter tube, or just the 4-resistor network and coupling caps before the splitter, or what?

The BM schematic I've seen uses four power tubes, so I'm wondering what differences might be appropriate for a 2 x 6L6 amp. On what little I've learned here, I'm guessing that the caps and R values after the splitter would still be appropriate for the stock D'Lite power section, the possible exception being the changes that kleinm suggested for making the 6V6 to 6L6 change.

Or perhaps another way of putting it would be "what components of the BM PI contribute to the bloom and harmonic complexity kleinm describes in the Bluesmaster PI?" I hate having to have someone hold my hand through what should be easy questions like this, but until dogears lets me apprentice in his shop...

[ampgeek]

I replicated the JCM800/2204 PI including NFB and presence systems.
See the schematic at mhuss.com. Tweak to taste from there.

Worked great for my Dlite. Still using standard Bnote iron but I am considering trying a different OT just for kicks.

Good luck,
Dave O.

[greiswig]

Thanks, Dave. Yep, it looks like there are some strong similarities. But there are also some differences if you look at the two side by side. I'm trying to learn here, though...

[ampgeek]

NICE g!!!

What is the origin of the 4 X 6L6 schematic? Is that the benchmark for the heralded Bluesmaster? I don't think that I have seen that one. Some of the recorded values are not standard (I don't think) which leads me to believe that they are measured values.

Regardless, the vast majority of the differences are within 10% which makes them the same in my book.

The presence pot and screen grid resistor values differ the most. The 15K presence pot will pass more current to ground (all else being equal) than the 22K resulting in less NFB voltage at the PI (e.g. less NFB "effect"). One of those "tweak to taste" things.

Not sure how the lowered screen grid resistors would effect the tone/feel of the amp though. I still have 1K's on mine but will give the lower ones a try to see what changes.

Still....there is no doubt in my mind that both plans will work!

Thanks much,
Dave O.

[greiswig]

ampgeek.

The Bluesmaster diagram was snipped out of the schematic at https://tubeamparchive.com/viewtopic.php?t=3344