- Fixed bias guitar amp manuals#
- Fixed bias guitar amp generator#
- Fixed bias guitar amp mod#
- Fixed bias guitar amp mods#
- Fixed bias guitar amp series#
As you can see by the bias meters on the left even very hot 6L6GC's only pull about 10 milliamps of plate current where they should be pulling about 40mA ( the far left bias meter ).
Fixed bias guitar amp mod#
We put this combination together especially for you guys who don't want to hassle with the bias mod or do not have anyone you trust to do it. Now it will sound better with a bias mod but it's NOT necessary.
Fixed bias guitar amp mods#
For you 5150 players who want to venture into “integrated Quad” territory without doing a bias mod, we have you covered! This is a stock 5150! There are NO mods necessary to run this setup.
Fixed bias guitar amp manuals#
They for the most part have never read or studied any of the classic tube manuals but most of them will be very quick to say, "Bias? No, you don’t have to worry about that, it’s fixed bias." So if you’re looking for a tech to bias your amp properly and you get this answer say, "Gee thanks!" and quickly move on to the next tech because they obviously know nothing about tube amps.
There are a lot of amp techs out there that have attended technical trade schools or have taken a couple college courses and have no real understanding of how and why vacuum tubes work. This is why most players who have tried both the head and the combo, like the clean tone and the combo's dynamic response better. Now you 5150 players who have played or own the 5150 combo don't have this problem, for some reason the combo's are biased much warmer and with the correct grade of power tubes they will bias up to a very nice 38 to 42mA with no need to modify them.
Fixed bias guitar amp generator#
If you check a stock 5150 100 watt or an Ultra plus 100 watt head using an oscilloscope and a signal generator which is the classic old school method of biasing a tube amp, you can plainly see crossover distortion in the wave forms until you get to about 33 to 34 milliamps of plate current then the sine waves look perfect. For some reason PV got it right and although the combo amps are also fixed bias they are fixed MUCH warmer and we can supply you with power tubes that will get the bias between 38 to 42mA which is right where they belong with NO bias mod. The 5150 combo and the Ultra combo are another story. It also causes the amp to be sluggish and lack dynamic response. This means the amp is producing what is called crossover distortion and cannot produce a good warm clean tone to start with. The power tubes while running just under 500 plate volts are only drawing about 10 to 12 milliamps of plate current. Players who only play gained up are usually pretty happy with the 5150 heads in stock trim, but players looking for warmth and anything near a decent clean tone will be left wanting. The 5150 and the 6505 are the same amps and they have an insane amount of gain in the preamp section. They have plenty of gain for a classic rock and early metal styles and they are well built and roadworthy. These are all fixed bias amps and need warmer grades of tubes to sound good. These are all early Peavey amps that are 6L6 based and steadily progressed ending up with the Ultra and Ultra plus.
The bottom end is extended and very tight and the breakup is oh so smooth! Peavey Butcher, Ranger, Roadmaster, Triumph and Ultra amps. The P10N is an excellent speaker with a top end chime second to none. As for the tone? It was very well worth the money and effort. Bob purchased a Weber AlNico P10N for his C20 (he paid more for the Weber than he paid for the C20!) When the Weber arrived he realized it wouldn't fit! The magnet on the P10N is huge! So he had to take off the bell cover and remove the speaker board from the amp and saw off 3/8" from the bottom of it to drop the speaker down. The Classic 20 is a gem for a small cheap combo.
The RM preamp is one of the nicest and most versatile preamps for the price. Bob has one of each of these in his collection. With the stock Chinese 12AX7’s or sovteks (the EH and new tungsol tubes included, as they are sovteks) it has a nasty honk! Peavey has started to use some of the JJ Electronic tubes and later JSX amps have been showing up with the JJ E元4's and even a few JJ ECC83S's! If your looking for Pawn shop treasures make sure you keep your eyes open for the discontinued Rockmaster preamps and the little Classic 20. The drive channel is pretty good adding a nice smooth distortion when using good tubes. If it’s a good blues tone your after then a fairly hot set of EL84’s will give a nice greasy tone with an early saturation. They provide a crisp, warm tone when using tubes with a moderate natural plate current draw. These amps are fixed bias and use EL84 power tubes. For a production made amp they are built well and sound great.
Fixed bias guitar amp series#
The Classic series amps have got to be one of the best working man’s amps ever built.
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