Appreciate the attention to detail The testing safety protocols reinforce the notion that end users need to appreciate the potential danger involved Really like the look of the amplifier
I been following this one closely. I can't wait until you do the final testing on it! Even though you went through this one much faster than the 12AX7 / EL34 amp, I still followed along well, but then again, I DO have an electronics background and I have worked with tube amps before, so you weren't going too fast at all (for me). It's looking great so far!
Good reminder about keeping load on tube amp.iv seen factory build low power amp with 50 to100 ohm 2to5 watt resistor across output lead under chassis.
Steffe! ElPaso tube amps just posted a couple of vids on the harmonic distortion of various octals at different power levels. It’s fascinating and supports what you’ve said about pushing a tube vs. barely idling it.
I build this exact same kegger amp a few months back. I rolled around 6 different pairs of 6EJ7 in the front end and with a 180 ohm cat resitor get on average 196v on the plate. Some tubes are lower, around 185v orhers are higher around 215v. You just have to try a bunch to see what matches. As a note I settled on 220k shade feed back after trrying a range from 180k to 300k. The 220k gives me an almost flat line of 1% THD result out to 6 watts befor climbing.
You are hands on and share knowledge, same here. Wondering what you think about the Schitt Valhalla 2. Noticed it is on sale and bought one, be here tomorrow. Have four tubes and lot of larger caps, going to use it as a preamplifier
I only ever do the electrolytic caps on my bypass. In some cases I use higher ERS caps because they will enhance the bass. They will not bypass for upper mid and highs.
Good one Stephe! Interesting idea using an led. I like that! Will there be about 30V across those external cathode resistors? If so, that's never really gonna hurt anyone!
The bypassing of electrolytes is a whole subject by it's self. I am not sure if you would buy extremely expensive bypass caps, that would then be an improvement. It reminds me of a series YT videos from a small channel from the UK. This guy took a vintage Sansui amp and tried a whole collection of coupling caps to see what sounds best. The conclusion was that the 50 year old original electrolytes where the best sounding coupling caps. That surprised me, I have to say. But there was no reason to doubt the listening skills of this person, so you have to take it as it comes I guess.
Appreciate the attention to detail
The testing safety protocols reinforce the notion that end users need to appreciate the potential danger involved
Really like the look of the amplifier
This is a very nice-looking amplifier build
I think so too!
I been following this one closely. I can't wait until you do the final testing on it! Even though you went through this one much faster than the 12AX7 / EL34 amp, I still followed along well, but then again, I DO have an electronics background and I have worked with tube amps before, so you weren't going too fast at all (for me). It's looking great so far!
It sounds awesome so far on burn in :) The low frequency response is on point.
@@SkunkieDesignsElectronics Sweet! Lots of bass is good! What speakers are you running it on?
for now the ones I know, RP600M
Beautifully done, Stephe. Thank you for going over the testing and analysis
Good reminder about keeping load on tube amp.iv seen factory build low power amp with 50 to100 ohm 2to5 watt resistor across output lead under chassis.
Steffe! ElPaso tube amps just posted a couple of vids on the harmonic distortion of various octals at different power levels. It’s fascinating and supports what you’ve said about pushing a tube vs. barely idling it.
I'll go check it out
@@SkunkieDesignsElectronics I went backwards. He tests the diff power levels only in the second vid
I build this exact same kegger amp a few months back. I rolled around 6 different pairs of 6EJ7 in the front end and with a 180 ohm cat resitor get on average 196v on the plate. Some tubes are lower, around 185v orhers are higher around 215v. You just have to try a bunch to see what matches. As a note I settled on 220k shade feed back after trrying a range from 180k to 300k. The 220k gives me an almost flat line of 1% THD result out to 6 watts befor climbing.
I picked 300K on my last one to brighten up the tone. I'll experiment with this one.
Yeah, I had the same experience with JJ rectifier tubes...
You are hands on and share knowledge, same here. Wondering what you think about the Schitt Valhalla 2. Noticed it is on sale and bought one, be here tomorrow. Have four tubes and lot of larger caps, going to use it as a preamplifier
Have no idea on that unit, sorry.
I only ever do the electrolytic caps on my bypass. In some cases I use higher ERS caps because they will enhance the bass. They will not bypass for upper mid and highs.
Well in my testing it 1000% changed the mid and highs.
Good one Stephe! Interesting idea using an led. I like that! Will there be about 30V across those external cathode resistors? If so, that's never really gonna hurt anyone!
40V, which I'm still not too worried about.
The bypassing of electrolytes is a whole subject by it's self. I am not sure if you would buy extremely expensive bypass caps, that would then be an improvement. It reminds me of a series YT videos from a small channel from the UK. This guy took a vintage Sansui amp and tried a whole collection of coupling caps to see what sounds best. The conclusion was that the 50 year old original electrolytes where the best sounding coupling caps. That surprised me, I have to say. But there was no reason to doubt the listening skills of this person, so you have to take it as it comes I guess.
Nothing surprises me anymore :)
It has been a fun build, but I don’t think that you have posted or shown the schematic of this project yet.
Not going to until I have tested and tuned it!