Let's TEST the "Bob Latino ST-120" using the BUG AMPS "ΩMG" test load!
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- Опубликовано: 10 сен 2024
- Link to the ΩMG Test Load ----- tinyurl.com/yc...
Link to the Measurements! ----- tinyurl.com/yr...
Link to our FB page ----- / bugamps
Link to our website ----- www.bugamps.com
Excellent technical review. I built one of these amps in 2018, absolutely love it. Three weeks ago I installed an auto-bias board and now I love it even more! It drives a pair of DIY Altec A7 VOTTs via DIY passive Linkwitz-Riley crossovers. My source is a DIY Raspberry Pi3/ Allo Boss DAC with 2TB hard-drive. The best preamp is no preamp, so there's just a step attenuator between source and amp. Gold Lion KT-88s
What did the auto-bias boards do to improve the sound quality? Were you to actually hear a difference in the sound quality?
@jebcamaro Absolutely no change in sound quality, beautiful as before. However, the tube bias is always spot on. Before the auto-bias board every Saturday morning I would meticulously have to readjust bias settings as it would drift quite a bit over the week, this ritual is gone. Also, no need to critically select matched tube sets (within reason of course). From the get go I was against the auto-bias, as I wanted a purist tube amp build, like the ones I worked on in the 70s. But now I'm a 100% convert!
I'm going to disagree, the best preamp for this amp is a PAS 3X
Would be interesting to repeat those tests with a Weber WZ68 solid-state rectifier on-board
I definitely agree
What specific Oscilliscope do you use? And do you recommend a specific non-DIY tone generator?
It’s just an inexpensive Hantek and works very well. The signal gen is also a cheap unit from AliExpress. Honestly anything decent will be ok, we’re just doing audio frequency work after all.
Good job!!!
Few questions: Would you mind sharing the schematic for the L-pad attenuation setup and such in your little box? Also, could you explain how the little Focusrite box gets connected and what software you are using with it to do the sweeps? Thanks so much in advance. Love your videos.
Sure! So the box is like this. The input from the amp connects directly across the 100w wire wound pot. Across means between the wiper and one of the other terminals. The DMM test points also connect directly to the inputs. The negative input is also connected directly to the negative side of the RCA and BNC jacks. Between the positive and negative input there is also a pair of resistors in series. They are 10k and 1k. They are parallel to the pot. The switch allows the positive pin of the RCA and BNC to either be connected to the positive input terminal or the junction between the resistors(or neither, that’s the off position).
The Focusright connects to the load via the RCA output. The Focusright has a 1/4” jack input that I’ve used a adapter on to convert it to RCA. I honestly wish it just had a RCA to begin with but it’s marketed for musicians who have equipment that use the 1/4” jacks more often I guess.
The software is called REW and is typically used for room measurement but it’s really excellent for devices too. There is a free version, so give it a try!
What software are you using for distortion?
REW