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Post by Deleted on Feb 5, 2018 9:16:14 GMT
My new Bugera V55 has TAD tubes so I'm assuming the previous owner took out the original Bugera tubes.
I wonder if they need biasing? I'm sure I will need to bias new tubes and wonder what kind of bias meter I need to buy? This amp has a socket for bias meter and a bias knob beside it.
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Post by salteedog on Feb 5, 2018 10:22:22 GMT
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Post by Deleted on Feb 5, 2018 10:46:25 GMT
Once again slatee is the linkmeister. Great link, fellah.
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Post by Deleted on Feb 5, 2018 10:55:16 GMT
Isn't that biasing something that Bugera eliminated with the Infinium version of the V55? By the way there is a little discussion about TADs on this Seymour Duncan forum. Trouble is I don't understand the question the poster is asking! What is 'this whole TAD thing'? |
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Post by Deleted on Feb 5, 2018 11:04:04 GMT
saltee I need a bias meter that has a kind of thicker aux like jack! Here is the photo for you to see it;  |
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Post by Deleted on Feb 5, 2018 11:13:36 GMT
Isn't that biasing something that Bugera eliminated with the Infinium version of the V55? By the way there is a little discussion about TADs on this Seymour Duncan forum. Trouble is I don't understand the question the poster is asking! What is 'this whole TAD thing'? Ah ok so the old Bugera V55 comes originally with TAD tubes  good to know! I will not go into all the tube wars out there. If I dont like the tone of the amp I will change the speaker instead! Tubes change ONLY when starting to be noisy or when dead! So if I stick to the same brand tubes I dont need to bias?? Right ? |
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Post by Deleted on Feb 5, 2018 11:17:05 GMT
BTW, TAD (Tube Amp Doctor) is a German firm that makes specs for a China factory to make their tubes. Thomann sells them since 2002!
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Post by salteedog on Feb 5, 2018 11:24:56 GMT
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Post by salteedog on Feb 5, 2018 11:33:02 GMT
From Eurotubes...
"The Bugera V55 runs a pair of 6L6’s and three 12AX7’s. It’s a two channel amp with shared EQ, a global master volume and non-tube driven reverb. These amps are adjustable bias and they feature a single RCA style test point. Unfortunately this test point is setup to read the negative voltage being applied to the control grids of the 6L6’s, and not the actual current flowing from cathode to plate. This same method is used by several manufactures (Peavey XXX/JSX comes to mind) and is terribly inaccurate. Because of this we recommend using a high quality bias probe and ignoring the test point all together. Bias probes can be found online from $25.00 for individual heads all the way up to several hundred dollars for full featured all in one units.One of the interesting things we noticed with the V55 is that the plate voltage is present even when in standby. Oddly enough when the amp is in the Triode setting the 6L6’s are actually flowing current just as if the amp was fully in the play mode, even though it’s not. I can’t imagine what Bugera’s aim was in designing the amp to function in this fashion."
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Post by Deleted on Feb 5, 2018 13:49:33 GMT
Maybe I bought a crap amp  no wonder Bugera upgraded their amps to Infinium models! |
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Post by salteedog on Feb 5, 2018 15:09:58 GMT
Nah...all that matters is that it sounds good. I wouldn't worry about design decisions that the amp designers made - there was probably a good reason for it. And as for the tube biasing...it sounds like it's best to do it in the same way as most other tube amps...in any case I wouldn't worry about that for now.
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Post by Deleted on Feb 5, 2018 15:26:19 GMT
Yeah, twiddle with more user friendly stuff first.
I had Bright and Normal inputs on my Tokai. It seemed as though Bright was for humbuckers to unmuddy them a bit and Normal was for single coils.
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Post by salteedog on Feb 5, 2018 15:39:18 GMT
Does the triod/penthode switch make much difference?
Also - does the tone improve if you run master volume full and manage amp volume through pre-amp and guitar vol?
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Post by Deleted on Feb 5, 2018 16:21:36 GMT
Yes the tone does sound better when Master is full on and then I tweak the others. My RP225 multi processor also helps heaps to get a nice fat voicing. The Triode sure sounds better to my ear and so does the Normal input (I play single coils)
I have noticed something interesting! I would like you gigging lads to enlighten me here!
When I play on low volume and set the amp EQ it sounds good. Then when I raise the volume so its playing loud the EQ is kind boomy and I have to turn down the Mids. Did you notice that on your amps?
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Post by salteedog on Feb 5, 2018 17:14:05 GMT
I'm no gigger but I have noticed on my 'loud' amps that bass is suppressed until it gets louder (as in above 1 or maybe 2 on the vol dial). Probably because the speaker cannot generate bass unless it's up to a minimum operating volume. But that's from really low (baby asleep in next room) volume.
And as things get louder then Fletcher Munson effect comes into play - where bass and treble will seem to get louder at the expense of mids (even though in reality the relative loudness stays constant).
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