I wouldn’t bother making any judgements whatsoever at this time .Stephen1966 wrote: ↑Mon Feb 06, 2023 8:30 pm Connecting up the NFB and biasing it properly will make a world of difference, I'm sure.
Looking forward to hearing the real results!
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I wouldn’t bother making any judgements whatsoever at this time .Stephen1966 wrote: ↑Mon Feb 06, 2023 8:30 pm Connecting up the NFB and biasing it properly will make a world of difference, I'm sure.
I tend to leave an new amplifier running for a few days before I change a thing . I have chased my tail trying fine tune an infant amp, only to go beck to exactly where I began as the amplifier finally began to break in . Don’t do it . Play it , put it on the shelf , play it again , put it on the shelf , and then start tweaking .bepone wrote: ↑Tue Feb 07, 2023 6:21 am congratulations!
fresh amp need at least 40 hours to settle down (midlle and high end harshness) , also connecting NFB will tame a lot of high end (now amp is in pentode mode, following speaker impedance curve, which is raising to high frequencies, so like result there is more highs then it is normal), also pentode characteristics are all but linear..
There's a lot to what you are saying... I've noticed a difference, just by turning the chassis around. I've spent the last few weeks peering at things from the back of the amp. I can't help but think it focuses the mind on particular aspects of the sound. Turn it around and you start to look at it from a different perspective, literally and sonically! I've heard differences as well, when a chassis goes into the cab, and obviously, when it's transported into a different space. I don't think I am losing my mind (truth be told, I lost it a long ways back) but I'm beginning to think it sounds different at night than it does during the day timeWhopperPlate wrote: ↑Tue Feb 07, 2023 4:20 pmI tend to leave an new amplifier running for a few days before I change a thing . I have chased my tail trying fine tune an infant amp, only to go beck to exactly where I began as the amplifier finally began to break in . Don’t do it . Play it , put it on the shelf , play it again , put it on the shelf , and then start tweaking .bepone wrote: ↑Tue Feb 07, 2023 6:21 am congratulations!
fresh amp need at least 40 hours to settle down (midlle and high end harshness) , also connecting NFB will tame a lot of high end (now amp is in pentode mode, following speaker impedance curve, which is raising to high frequencies, so like result there is more highs then it is normal), also pentode characteristics are all but linear..
Even just leaving it unplayed for a month seems to homogenize something , I have walked away from amplifiers frustrated I couldn’t get the desired response only to revisit them later and realize they have matured for whatever reasons.
You aren’t losing your mind. there are certainly a myriad of variable factors to consider . Interactions with other electronics with in the mains power supply from neighbors can influence voltage levels and introduce various noises within the ac voltage , and this can obviously depend on where you live and what time of day .Stephen1966 wrote: ↑Tue Feb 07, 2023 5:31 pm
There's a lot to what you are saying... I've noticed a difference, just by turning the chassis around. I've spent the last few weeks peering at things from the back of the amp. I can't help but think it focuses the mind on particular aspects of the sound. Turn it around and you start to look at it from a different perspective, literally and sonically! I've heard differences as well, when a chassis goes into the cab, and obviously, when it's transported into a different space. I don't think I am losing my mind (truth be told, I lost it a long ways back) but I'm beginning to think it sounds different at night than it does during the day time
I have a question for all of you have who have trodden this path before though. Where do you prefer to bias it? Where does it speak for you? With an average 70% bias or something a little cooler?
The body of the listeners tend to notice things before the mind. My desire to play and my ability to long durations of high volume directly correlates with the quality of sound coming from the speaker. I will get tired and become disinterested in playing if the sound feels wrong . I noticed this growing up listening to a million shows , with good and bad bands with good and bad sound techs . some nights I would just get tired and fall asleep on the nearest chair mid set because it was so much ear fatigue.
You are correct. sound pressure changes with environment fluctuations. Sound waves move faster through the heat and slower through the cold. I remember reading a study that indicated a considerable deviation in pitch with a 20 degree Fahrenheit fluctuation . This combined with humidity plays all kinds of tricks , and the wood guitars themselves have their own susceptibility obviously .bepone wrote: ↑Wed Feb 08, 2023 8:21 pm I think is mostly because of main voltage variation, but to add more to this crazy subject
During the same amp setting, under sunny day and rainy day, amp becomes unplayable! I know for psychoacoustics, but i started to believe that speaker wave propagation or ear wave receiving under rainy day - under different atmospheric pressure - has different perception , mostly negative! So i quit with guitar or sound evaluation in those days
this is because of transformer resistances in primary- secondaries, more current more voltage drop, this is all normalStephen1966 wrote: ↑Tue Feb 14, 2023 8:19 pm
First thing worth mentioning is that I can bias to the B+ voltage of 465.5V and I get a pretty cool bias point or I can bias to 30mA but then my B+ comes in at around 460V. I can't get both. I
unfortunately agreed.......Stephen1966 wrote: ↑Tue Feb 14, 2023 8:19 pm More fun with high voltages - more testing! Same old story - not enough hours in the day