Bill Z Bub's..Peavey JSX VS VHT Pittbull review

[GodWentPUNK]

Looked at the online user guide for this...pretty sad in my oppinion. However, I do have a couple of questions.

1. Has anyone performed a BIAS on this amp. It looks pretty easy but it would nice to hear from someone who actually did it.

2. Footswitch modification. The footswitch operation is really crappy. For example, if you want to use the lead/crunch channel, you need to first hit the clean channel bypass button. No offense, but when you're on stage and want to go into a solo, you don't need to pressing all these buttons.

thanks!

joe....

[akoch]

1. BIAS is super easy indeed. A good voltmeter and a small screwdriver is all you need. Locate the four small pins on the backside (remove the back grill), put new tubes in, let it stay in the idle (but not standby) for a couple of hours, then set both sides to 94mV, adjusting the two screws. Remember that adjusting one changes the balance on the other side, so there will be a few iteration. Remember about the electrical safety, if you are not comfortable with this - seek help.

2. ???? Am I missing something on the footswitch? You just hit lead or crunch button directly, and go into that mode. No need to do anything on the clean channel side. Joe, it does sound wierd, looks like something is mulfancioning in your amp. No need to modify anything (unless somebody did it prior to the switch, then just 'undo' the mod). It is just a regular floorswitch, works exactly as any other out there.

As for the loop, I recall we discussed this. Again, I'm not sure what is that with your amp. I am using either G-Major or Intellifex in the loop, and there is no realistically detectable sound degradation. The effect loop in the TSLs is well designed, using OPS amps, just like it is done in the pro FX units. So compatibility is not an issue there, unless something is broken.

Hope this helps.

[GodWentPUNK]

For clarrification: I do not own a JSX but am interested in doing so. I do own a TSL100.

2. ???? Am I missing something on the footswitch? You just hit lead or crunch button directly, and go into that mode. No need to do anything on the clean channel side.

From the JSX owners manual:

"35) ULTRA/CRUNCH SELECTOR
This switch selects between the Ultra and Crunch channels on the amplifier. The adjacent LED will illuminate when the Ultra channel is selected. When the LED is dark, the Crunch channel is selected.
The CLEAN SELECTOR (36) must be in the BYPASS mode to activate either the Ultra or Crunch channel."

Maybe the doc is wrong... Wouldn't be the first time
(ie Also from the user manual -- Features • Three 12AX7 preamp tubes) :ROTF:

joe...

[khabibissell]

1. BIAS is super easy indeed. A good voltmeter and a small screwdriver is all you need. Locate the four small pins on the backside (remove the back grill), put new tubes in, let it stay in the idle (but not standby) for a couple of hours, then set both sides to 94mV, adjusting the two screws. Remember that adjusting one changes the balance on the other side, so there will be a few iteration. Remember about the electrical safety, if you are not comfortable with this - seek help.

94Mv??!! I'm not an amp tech or anything, but I've had my 6L6's as high as 50Mv and EL34's somewhere in the forties, but 94? I would think if the idle is set that high, the amp would melt...

[GodWentPUNK]

94Mv??!! I'm not an amp tech or anything, but I've had my 6L6's as high as 50Mv and EL34's somewhere in the forties, but 94? I would think if the idle is set that high, the amp would melt...

I think on a 100 wat system, because you have two tubes per bank, you need to double that of what a 50watt amp would be. I set my 100watt Marshall anywhere between 87-92mv.

joe...

[khabibissell]

There ya go... I don't know what I'm talking about

Carry on...

[horns666]

I'm glad you guys know the shit..right on..

[jwoods986]

Hey, does anyone here with a JSX run it through a 2x12 and can suggest a good one? I know the JSX sounds good through the Peavey 4x12 but I would prefer a 2x12 if I got one.

[kmanick]

I've got a somewhat "dumb" question but the JSX is 120 watts.
my Marshall cab (1960AX) is 4 X 25 watt greenbacks =100watts.
Can I run this head into my cab without blowing out a speaker?
if yes could I dime the master volume and Run it into a hotplate and
then into my Marshall cab? Or can I only run this if I keep it at a 'reasonable" volume?
Or am I better off getting a cab that can handle higher wattages(although this Marshall cab ain't going nowhere )

[akoch]

Joe, I misread you and did not realise the question was about the JCX's bias and footswitch. 'Ops'.

[Twisteramps]

I've got a somewhat "dumb" question but the JSX is 120 watts.
my Marshall cab (1960AX) is 4 X 25 watt greenbacks =100watts.
Can I run this head into my cab without blowing out a speaker?
if yes could I dime the master volume and Run it into a hotplate and
then into my Marshall cab? Or can I only run this if I keep it at a 'reasonable" volume?
Or am I better off getting a cab that can handle higher wattages(although this Marshall cab ain't going nowhere )

My JSX is probably the quietest 120watt head I've owned. It's plenty loud, but I don't think it's pushing 120 watts. You could do two different things though:

1) run two tubes instead of four in the power section
2) Just don't dime the volume. If you're playing around the house, I bet you don't use more than 15-20 watts.

Pete

[Twisteramps]

Hey, does anyone here with a JSX run it through a 2x12 and can suggest a good one? I know the JSX sounds good through the Peavey 4x12 but I would prefer a 2x12 if I got one.

The G-Flex 2x12s are hard to beat for any amp.

Pete

[toddstaples]

+1

The G-Flex 2x12s are hard to beat for any amp.

Pete

[Fragle]

framus CS 212 cab with v30 speakers. i'm using it with my 5150, and i swear the damn thing NEVER sounded better. cheap as fuck, too. i paid 290 euro shipped NEW.

[nateb]

+1

I have two of these thigns in stereo. They are a good cab with some serious low end balls.