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Bassman Bias Question

johnJhicks

New member
Joined
Jul 26, 2019
Messages
1
Chinese cell phone producers have assumed control over everything except the high finish of the cell phone market in 2017. They have done this by misusing pretty much each and every specialty and by making telephones that are only all around heavenly gadgets that are likewise extraordinary worth. The A57 from one of China's biggest cell phone brands, Oppo, is the ideal illustration of both of these patterns. The A57 is a wonderfully made telephone with a plan that is plainly propelled by the iPhone 6/7. It is an all-metal bodied telephone with a screen to body proportion that is stunningly better than the Apple gadgets that have propelled it.

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The A57 additionally has truly extraordinary form quality that makes it stunning to hold in the hand. Sadly, the tricky completion and the adjusted plan of the telephone implies that a large portion of these telephones will be utilized in originator cases for the Oppo A57. The telephone has an incredible processor with eight centers, which should prop you up pleasantly and have enough force for even the most requesting Android games.

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It's about the A57's camera
So what is the specialty that Oppo is attempting to take into account with the A57 you inquire? The appropriate response lies in the camera. Not in the 13 megapixel unit that lies at the rear of the telephone. Notwithstanding, since we are discussing the back camera of the A57, how about we simply give Oppo some credit for that reality that the back of the telephone is totally smooth, with no camera knock. This means you won't need to turn to Oppo A57 cases and covers to get a telephone that you can lay level on a table. In any case, it is the front camera of the A57 that is the feature of the gadget. The selfie camera, as Oppo calls it, is an astounding 16 megapixels! Believe it or not, the forward looking camera on the A57 really has a higher pixel tally than the back confronting unit on the telephone.

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There's no uncertainty who the A57 is focused at that point, its kin who take a ton of selfie photographs or shoot selfie recordings of themselves. In case you're one of these individuals, the A57 is the telephone for you.In a market where a ton of producers are as yet putting 2 megapixel forward looking cameras on telephones that cost more than the A57, the 16 megapixel shooter is stunning. At the cost that the you can purchase the A57 for on the web, the telephone is the ideal decision for the selfie-dependent.

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The camera programming utilized by Oppo A57 is really clever. It offers various shooting modes and settings, generally remarkable of everything is the Ultra-HD mode that takes 10 sequential HD pics and lines the best ones into a solitary 50MP picture.

Cost and Verdict
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Cost and Verdict
The Oppo Find7 retails at around US$600 without a membership. Despite the fact that the outside of the telephone is a smidgen on the dull side, its exhibition and equipment isn't anything to wheeze at. The Find7 can perform similarly also, if worse than the vast majority of different telephones at its value section. The amazing screen show and stalwart innards make the Find7 perhaps the best telephone out there and it is unquestionably deserving of your consideration.
 
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thejaf

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Joined
Oct 27, 2006
Messages
527
No, it's the circuit as a whole. You could have that modded (lower capacitor values to start with) but then it'll no longer be a bassman to the purists.
 

Blackjack30

Active member
Joined
Apr 9, 2016
Messages
321
If you swapped power tubes without biasing thats a problem, period.

Not sure about your bass issue but it is a "Bass amp".
 

LeonC

Well-known member
Joined
Aug 30, 2002
Messages
799
If an amp was improperly biased, I think you'd notice other things long before you'd notice tonal differences. The feel would be way off and the amp wouldn't sound healthy.

In the case of really cold bias the amp typically has an overly distorted sound, quite unpleasant. Biased really hot, the amp may sound very squishy and on "the verge of meltdown." If the bias is far enough off, the amp may not even produce sound.

But too boomy? No, I don't think that's an improper bias. A Bassman, say a 5F6 type circuit, has quite a bit of low end. I typically play it with the bass turned way down.
 

bluesforstevie

New member
Joined
Jun 20, 2002
Messages
12,771
Overbiasrd will get real spongy and under biased will sound harsh with nasty distortion. It is a bass amp...just like a JTM45 turn bass almost all the way down. YMMV
 

Wally

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Joined
Feb 27, 2003
Messages
3,535
Imho, it is best practice to know the voltages and bias numbers when new power tubes are installed...and perhaps before. Let’s go ahead and say that it is best to always know what is going on. That way, we have a basis for understanding whatever changes take place whether those changes would be some component failing or just changing power tubes. To answer your question, check the bias so you know what it is. If it is in what most ups consider a usable range and the amp’s Sonics are very different from before, pop the old tubes back in, listen, and take the measurements again to see how those tubes operate in the amp. With all of that information, you will have some idea of why the amp sounds different. If the bias numbers happen to be similar, then the tubes sound very different for each other....and maybe you have to run the tones differently? If the bias numbers are drastically different, then Regina’s the new tubes to the same numbers as the old tubes yielded...what does the amp sound like now?
This is the only way I know to compare tubes and biasing...and the resultant Sonics.
 
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