WIP Amp build - Deliverance 60 made 2 channels

[Asdrael]

Ahh good choice on the Wima caps. I have FKP1, MKP10 and MKP4s here. I've also got Vishay axials in the turret board JCM.

How much space do you have under those large power resistors?

I love my WIMA caps. iirc I made it so signal only goes through polypropylene too cause I am a snob. I tried avoiding axial caps here because my self imposed constraint was a small footprint (so it fits on my desk ).

Any resistor that could see more than 1W is installed 1mm high - or should be- and everything I could has been installed with 90degres kinks on the leads just in case.

As far as I could measure it the insides stay coolish - the main culprit for heating would be the LM317. The heatsink I chose is oversize though so no problem so far. I still could likely cook breakfast crispy bacon on those KT88 holy hell.

that crunch

Crunchiest distortion ever. Breaking it in, knowing how to dial it in better and for me changing the tubes made the top end slightly smoother and the low mid more present. I love it.

 

[NickKUK]

I've just been doing some ESR calculations for my tube compressor as the Vishay 0.1uF has an ESR at 62Hz of 7R7! I remembered you have a MKP10 in there and use MKP4. Looking carefully it looks like the MKP10 is C2 and on the first stage output. The MKP10 you have there is 630Vdc/400Vac, the equivalent ac matching MKP4 would be 1000Vdc/400Vac also being the same size (there's two package sizes for that value of mkp4).

The loss angle of the MKP4 at 1KHz is 3x10^-4 and the MKP10 is 6x10^-4. The short of this, at 62Hz-1.3KHz range, the ESR for that MKP10 is higher than the MKP4, which leads to a slower response than the MKP4 for the same value. It should be a better sound (I found the MKP4 a clearer cap vs the MKP10 in a hifi project).

I'm switching from the MKP1839 to the MKP4!

 

[Asdrael]

Interesting. Thanks for the information. To be perfectly frank, I just "fit the caps" aiming for values, small form factor, and PP on the signal path. I haven't dug at all in these important details for the non-electrolytic caps.

I'm currently building yet another guitar, but I was planning on fine tuning this amp afterwards (inclusion of a proper buffered FX loop, possibly playing with the bright cap of Gain I, slope resistor, or just mess around with the tone stack in general). I'll revisit the MKP10 I can have in there and try to see if I can get some MKP4 instead. Cheers!