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Amen my friend. I got it all working awhile ago. It sounds killer.

I used the Hammond 270ax PT for this one

Hello sir - I just posted the functioning voltages for the amp. They're pretty similar to what I had before but definitely some differences. This thing sounds great - thanks again for the help! I couldn't see how to edit the initial post (not sure if I even can) to reference that the correct...

The following are my DC voltage readouts for a fully functioning Micro Bassman LTP, as designed by @robrob Thanks again to the fantastic community here for helping me get this thing into rock n' roll shape - it sounds GREAT. B+1: 314.6 B+2: 312.7 B+3: 258.9 Pins in vDC V1 (12AY7) V2...

Good call I’ll work on this today!

Okay so unexpected success… I was doing some cleanup on the amp and all of a sudden it roared to life and is working with no oscillation… I checked it left, right, upside down, and sideways over the course of about 30 hours and I didn’t find any shorts… but my guess is that I nudged something...

Just added the new voltages with new 12ax7 installed

Just put in the new 12ax7 and got the following for V3 1) 268.4 2) 1.51 3) 10.58 4) 10.71 5) 10.71 6) 268.5 7) 3.86 8) 11.02 9) 11.02

So guitar signal is NOT passing through all I can hear is motorboating/oscillation. All heaters glow the same, yes. And finally I do have another 12ax - I’ll pop it in now.

@D'tar just got the new readings added. Thanks again!

Alrighty - new measurements with the cathode resistor reattached... B+1: 318.8v B+2: 316.4v B+3: 262.7v V1 V2 V3 V4 V5 1 151.8 149.5 260.9 318.1 119.5 2 .7mv -1.0mv 3.85 30.1mv 7.4mv 3 2.525 .97 (volts, not mv) 11.54 11.71 318.8 4 10.11 11.3 11.54 11.71 11.84 5 10.11 11.3 11.6...

Great Ill get on it now - thanks!

Great input thank you - so I’ll reconnect that wire and remeasure just V4 again correct? Funnily enough that’s the way I did it first, I just thought it was an error so I undid it.

Just posted my readouts!

DISREGARD THE B+ AND PIN READOUTS HERE AS THE 820ohm CATHODE WAS DISCONNECTED FOR READINGS. PROPER READINGS ARE IN POST #15 Hi everyone - I just took the measurements. To confirm: any test connections have been removed and the amp is "stock." The only thing I am not sure of is the 820Ohm...

Thanks guys - right now I’m able to play it with pseudo normal sounding guitar tone coming out of the speaker, BUT — I have the cathode of the LTP (V3 12ax7) grounded and also the cathode of the 12au7 power tube disconnected from the 820ohm cathode on the far left of the board and grounded on...

So I don’t think I’ve made one before as a “complete” table - do you just mean current voltages of the tube socket pins and nodes?

Hi everyone, This is my first time posting here, but I’ve been a lurker on TDPRI for years. Admittedly, I’m green at this and it’s only my second build, but I do generally understand wiring at a basic level. My current build is a Micro Bassman LTP from Rob Robinette’s site. Everything is...