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Post subject: El84's in a SRRI or CVR
Posted: Sun Jun 13, 2010 7:55 am
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The SRRI that I just bought came with a set of yellow jacket adapters and a pair of EL84s. So, I popped them in to see how they sound compared to the 6L6's. I have to say, I like it. It really quited the amp down, and added some very nice overdrive, all at volume at less than 5. With a telecaster, it's got some nice bark without being over powering. The SRRI has copperheads & rajun cajuns.

But now, I'm thinking of putting those in a stock CVR with stock speakers. my biggest two questions are: 1) I've read that running EL84's in a 6l6 amp can be a recipe for disaster. Is that true? and 2) has anyone else tried this with a CVR and what were the results?


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Posted: Sun Jun 13, 2010 7:45 pm
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Hi there Sphinx, and welcome to the forum. From where I'm seeing this conversion, I don't see the technical problem, unless the components in the THD unit fail. Can you supply the link, that speaks to the impending disaster? I've been thinking about trying these in a '68 Bassman for a while, and haven't found any reason not to. There doesn't seem to be a compromising condition with the power trans, suppling the appropriate voltage or current. And as long as the tubes output impedance matches the output tran's primary needs, it should function just fine. Art

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Posted: Mon Jun 14, 2010 6:20 am
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This is one of the posts that I saw. I imagine that the EL84 faces the same issue since they are in the same "family". http://www.vintageamps.com/plexiboard// ... 73&start=0

But my guess is that the yellow jackets take care of the voltage issues, right? (I'm a neophyte when it comes to anything electrical).

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Posted: Mon Jun 14, 2010 8:47 am
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The EL84's will cut the volume down on the SRRI quite a bit and it will break up pretty early too. Generally a pair of EL84's are used in 20-30 watt amps. The EL34's are more in line with the 6L6 power tubes. The EL34's do need and adapter like the Yellow Jackets. I never really liked the way EL84's sounded in a 6L6 designed amp, but if you like it, that's all that counts.
That's why I like my Egnater so much. It employs both 6V6 and El84 power tubes and I can blend them to any degree I want or at the turn of a knob go 6V6 or EL84. They just compliment each other.

I've never heard of anyone damaging an amp using Yellow Jackets. To me though, it just seems wrong. Everyone I know who's done the conversion, eventually goes back anyway just because they get tired or it. Personally, I'd put the 6L6's back in, and but a Princeton or a DRRI for lower wattage natural distortion.

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Posted: Mon Jun 14, 2010 6:38 pm
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Yeah, I see what you're talking about. But the EL84 and the EL34 are very different power tubes. The EL84 would put far less demand on the power transformer than the EL34, and even less than the stock 6L6's. If you want to experiment for the sake of tone, then I'd say go for it. Art

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Posted: Mon Jun 14, 2010 6:47 pm
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I agree 1,000% Art. EL84's would be a lot easier on the amp without a doubt. Like I said, I know a few musicians who use Yellow Jackets with no problems. I tried my friends in my HRDlx and didn't care for them that much. A SRRI might be a different story.

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Posted: Tue Jun 15, 2010 6:08 am
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63supro wrote:
I agree 1,000% Art. EL84's would be a lot easier on the amp without a doubt. Like I said, I know a few musicians who use Yellow Jackets with no problems. I tried my friends in my HRDlx and didn't care for them that much. A SRRI might be a different story.


Well, here are my two cents. With my Tele, it's absolutely glorious. You get a very smoth overdrive, without having to crank it up. And never got muddy. But you lose the great Super head room. Best way I can describe it is that it hit Sheryl Crow's Real Gone easily.

But with the Strat, it wasn't as much fun. It was fine, but indistinct. Also never muddy, just unimpressive.

My setup is a cry baby > vox wah > TS9 > H&K Tube Factor.

Tonight, I'll try a set of 6l6GE's I have sitting around. I think that for the all-around versatility, it's going to have to be either the stock 6l6SV's or these 6l6GE's.

And when I have time, I'll try the EL84's in the CVR to see how that works.

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Last edited by SphinxRacing on Tue Jun 15, 2010 7:11 am, edited 1 time in total.

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Posted: Tue Jun 15, 2010 6:40 am
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That was how I found it when I tried. I didn't get the same results with all guitars. It sounded great with my 63 Supro Martinique, not great with my Strat or 57 Dano U1, decent with my modded Ibanez AS73 etc. Seems like Humbuckers were better than single coils. From my point of view, I needed an amp that would respond better with singe coil pups as well as Humbuckers. My Supro is Humbucker style equipped, but has some type of Piezo/contact pickup built into the wooden bridge. That was virtually unusable. All it did was squeal. I think that's why most people I know go back to the stock configuration. It just doesn't sound great with multiple guitars. It seemed like too much work. So for the price of the Yellow Jackets, I built a couple of pedals. :wink:

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