XjFred's latest activity

my experience - with guitar amps at least - is that the V1 position is the most critical and affected by the choice of tube. (i would...

Thank you @JohnnyCreepy , that makes sense. As for the pre-PIMV, I found two solutions and I can't figure out which one to choose : -...

When using 6v6 with voltages higher than or near limit mentioned on datasheet and having bias tapped from HV I’d go for pre-PI master...

Thank you, everyone!! You’ve given me plenty to learn and a few problems to solve. Now I have some decisions to make: - Which solutions...

Here are several examples of Dumble amps with schematics in PDF format. Serial#s 102, 124, & 183 as well as the Steel String Singer...

As a first build just go with the schematic, make it work well and silently and then iterate/mod it imo. Get comfortable with it.

As a chief engineer in the merchant marine, I hope being able to stay vigilant, although I also know one should never be too confident...

@XjFred I recommend consuming these: https://education.lenardaudio.com/en/14_valve_amps.html...

I plan to use it in my home studio or for small blues jam sessions with my guitarist friend. I have an Ampeg Micro VR, a 160W...

Thanks for these advices. I need to think about that—it might be interesting to have a mid-range control. But I'm afraid that if I give...

I think a MV between tonestack and PI is sufficient, but some prefer a post PI MV. And by changing the tonestack I mean using something...

You misread good, for clarification and hazard safety note 470r-1000r aka 470 ohm to 1 kohm. Bias probe is a gimmick if you don’t bias...

Type2 Lar-Mar is the one that a lot of DIY people use. Make sure to have those safety resistors (2.2M is pretty common) Dropping the...

Thank you both. These are some things to think about before I place my order. I've found this schematic. If I understand correctly...

Quick look on schematic had me thinking it might be a noisy circuit and need tweaks f.ex. input resistor values. Just solder...