valve jr vs GA5 circuits, tweaking

[bolero]

hey this is interesting, apparently there are only 4 different resister values between the valve jr & the newer GA5...he explains some details

 

 

http://www.youtube.com/watch?v=yQl_1EqxnBE&feature=youtu.be

[koula901]

That was a really neat find! I have a valve jr and if I knew how to pull those little things out and solder, would consider modding it. I wanted to hear him play through it louder. You know what would have been neat - I'd love to hear a side-by-side comparison - first video he plays it pre-mod, second one, post-mod so we can compare the sound. Are you planning to do this mod to an Epi, Bolero?

[DetroitBlues]

I found a lot of good mod's for the Epi. Its really not hard, but I'm wasn't brave enough for it...

 

Most common kits are on Bitmo's website...

 

http://www.bitmomodkits.com/servlet/the-Mod-Kits-for-Epiphone-Valve-Jr/Categories

[Gitfiddler]

That's a cool video. I wonder if he has recommendations for modding the GA5?

[fretless]

Those are cool amps and there are a truckload of mods out there . For me 5 watts is too loud for the apt. I have a Blackheart Killer Ant and even that is loud in the bedroom , and it's less than 1 watt , though has a high db with a good speaker . There are also some new mini's out there , I personally would go for the VHT special 6 , it's stupid easy to mod , has swappable tubes and sounds pretty darn good . These are good times for mini amps though, that's for sure .

[michaeljames]

I have an EVJ with Bitmo mod and an EVJ with Bitmo Brat mod. Each has matching cab. They are really nice. BUT, they don't compare to these. I also have one of these (The bay $300) and I have not used either of the EVJs since. Check The bay for similar current listings.

 

 

 

 

 

We’ve been eager to get our hands on a Rebel 20 since the prototypes showed up on video many months ago. Some people will call it boutique gear, and it is clearly a pro-level amp, but there’s a far broader appeal here than the term boutique usually implies. For starters, it’s lightweight (and an easy rig to find room for) but it’s loud enough to sound like it should take up a lot more space. That’s good and loud. It’s also sturdily built, uncomplicated, and visually appealing. Oh, and it’s got seriously killer tone.

Knowing Egnater’s amps (as well as his reputation), I was expecting a solid tone machine, but I’m just blown away by how good the Rebel 20 is as an all-around rock 'n roll amp. It’s really small, but it’s also really big. The appeal of a premium amp at this price might make it a considerable option for beginners and cash-strapped gearheads alike, but there is absolutely nothing here for a true purist to sneer at. Here is pure tube tone, feel and responsiveness for the masses.

 

Features

 

The Rebel head uses Groove Tubes: three 12AX7s in the preamp, a pair of EL84s and a pair of 6V6s. It’s also got a variable Wattage control (that goes from 1 to 20 watts) right on the front panel, so it’s got the room covered, whether it’s the den or a small club. It weighs only 16 pounds and comes with a shoulder-strap carry bag, so it’s perfect as a “grab-and-go” amp, but it still packs a hell of a punch. Our review model came with two 1x12 Egnater closed-back birch cabinets. These are each loaded with a 12” custom-voiced Egnater Celestion Elite 80 speaker (the same speakers as in the Tourmaster combo I dig so very much). The small cabinet is front-ported to facilitate a phenomenal bass and high-end response. One cabinet is really enough for everything but a big venue, but two are… you know, better. Open it up, and you can really push some air, but it doesn’t get to ear-bleeding levels.

Both amp and speaker cabinets have the same two-tone covering, checkered grille-cloth with cream piping, and big Egnater logo that make his amps so easily recognizable. The design is not an extravagant departure from the traditional, but it does give the amp its own look. In addition to the Watts control, the Rebel 20 features a single input, On/Off and Standby switches, a standard 3-knob tone stack, Master Volume, Gain, Tight and Bright switches, Tube Mix control, and an effects loop that accommodated a variety of effects with no tone loss or noise. In other words, you get a lot of control over this pint-sized beast.

 

Tube Mix

There are many new ideas in high-quality amps these days, but few that routinely get down to business like Bruce Egnater’s ideas. The original big idea for the Rebel 20, when it was first announced, was to offer a switchable option between 6V6 or EL84 output tubes (check out the video from the New York Amp Show, or NAMM 2008 for a look at the prototype). 6V6s are said to be smoother and warmer, while EL84s sound more vigorous, raw and chimey, like the classic British-voiced amps. What everybody knows, though, is that however you describe them, there’s a distinct difference in the way they sound, so this feature is like having two amps in one high-quality, single-channel head.

But it’s really more than two, because when a problem arose with making the option switchable, instead of just scrapping the notion, Egnater decided to improve on it. He put the output tube selector on the front control panel, next to the Watt and Tone controls, and then made it variable. Now you can choose between EL34 or 6V6 output tubes or, if you like, you can blend them together in whatever ratio suits you. What that sounds like, I’ll get to, but first I’d like to pause and respect the exceptional pragmatism of that idea.

The advantage of blendable output tube types really comes down to adding versatility to the amp’s voicing—much more than you can get by just switching tubes. There is enough versatility there to dial in a whole catalog of great rock tones. You just need to adjust the front panel controls while you play, and let your ears do the walking. This is going to appeal as much to gearheads already deep into high-end amps as it will to players who may be shopping around for an upgrade but haven’t decided how far they want to go. And of course the knob-fiddler in me finds it extremely gratifying.

Just experimenting with the controls while I played it, I started recalling songs I haven’t played in years. The tones were so authentic. Blues-rock, glam classics, garage rock, definitely metal, meaty eighties power chord stuff, Detroit sound; this amp does all of it. The Rebel’s got a well-defined, articulate crunch that loosens or tightens with a twist of the Tube Mix knob, or the flick of the Tightness switch—a rumble removing cutoff that helps you to keep the low end from getting too flabby or mushy at higher gain. With the EL34 output tubes selected, using the switch will give you that controlled, Marshall-sounding bottom. The 6V6s are a little rounder and softer, while the EL84s are a little throatier, bolder, with more bite. With gain, both exhibit crispness, satisfying harmonics and sweet sustain. The Brightness switch adds presence and clarity; using it along with the Treble control vastly expands the tonal variety of the high end.

With either output tube type selected, the cleans are full and balanced, and the distortion just rips. The Gain control has a lot of room, and it’s got great saturation even at low wattages. The amount of control you have over the smoothness is pretty amazing. With some healthy gain and volume, the amp has a superb growl, even with the thinner bite of my Telecaster’s single coils. It never gets too spanky or twangy, but it will take you from blues to a southern rock sound with ease.

There is a lot of gain here, far more than you’d need for all but the hardest rock. You can easily pull off metal, and the old-school metal tone will knock your socks off; the low-mids are not for the fainthearted, and the ported cabinets are obligingly responsive to ass-kicking low end. Dime the Rebel 20 and set the Tube Mix knob to 6V6 and this amp becomes a blunt weapon, but not a bludgeon. Turn the Tube Mix over to EL84 to add a fierce edge for thick, searing leads.

I had to share this amp with somebody—it was too good to keep to myself—so I invited fellow reviewer Jordan Wagner to bring a guitar in and give it a listen. We plugged in his 1978 LP Custom with Tom Anderson pickups and immediately came down with a case of “Now that’s what I’m talkin’ about!” fever. I’m still having dreams about that tone, it was so ballsy and pure. The Burstbuckers on an all-mahogany LP Studio also sang and cried—the crunch from the bridge pickup was edgy and bright, and the woman tone off the neck pickup was like a fat, rich howl.

Like Egnater’s ideas, the quality is also first class—it’s built like a little tiny tank—and his team has earned a reputation for taking care of their customers and their business. Unless you’re a one-amplifier kind of player, and you love that one above all others, it’s very difficult for me to see any reason why you wouldn’t go for one of these. This is paradigm-changing gear.

 

 

 

 

 

[DetroitBlues]

I've looked into the Rebels, they are small and light. Lots of great reviews, very little negative. I wanted a combo of the amp which is a 30 watt amp, however that one has issues with reliability unlike the 20 head. However, I think they are rather overpriced for being produced in China.

[michaeljames]

i agree if paying msrp ~ but you can pick them up all day long for $300 - $400 ~ and thats hard to pass up imo. those epi's

with bitmo and matching cabs go for $250 and they simply can't compete with the egnater's ~ again, imo.

i don't have an issue with the china thing. i know some do. i wish this country could produce more products at home in good 'ol usa, but they can't make money. sad.

 

[DetroitBlues]

I picked up a brand new EVJ head for $70 out the door from Guitar Center. Adding the Bitmo kit would of brought me to around $130. Not bad considering.....