82DMC12

Hey all,

I just picked up a used 6505+. It's a 2012 model but I'm not sure if the tubes are correct.

It has in the preamp, from left (closest to power tubes) to right:

1. JJ ECC83S
2. JJ ECC83S
3. JJ ECC83S
4. Groove Tubes Premium GT12AX7R
5. No name, silver tip
6. No name, silver tip

The tubes in 5 and 6 appear to have the name faded or rubbed away. There no markings at all anywhere else on them except a small "10" at the base of one and a "7" on the other. The silver tip is about half as long as the Groove Tubes in #4, so I don't think it's a GT.

Basically, I'm looking for a sound for a C-tuned or drop-Bb guitar that sounds like Sybreed, Fear Factory, bands like that. Can anyone recommend which tubes to put where to get where I want to be?

30 years old and first tube amp :-)

Thanks,
Andy

Perverockstar69

Frankly those JJ's are the right choice AFAIK, put some of those on 5 and 6 too...

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Robbgnarly

If it sounds good to you then you have your answer.

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82DMC12

It does sound good, but the clean channel gets some drive anytime I have the pregain above 0.5 when I pick hard. This is on an RG560 w/Evolution pu and a Schecter C1 with active duncan-designs. I was hoping I could get it a little cleaner in the rhythm section but maintain a great lead channel. I think the 'no-name' tubes MIGHT be the original EH's, looking at pics online.

BCKRedBaron

That seems to be the nature of the beast with the 6505. KailM on these forums used a JJ 12AT7 in one of the slots in his 6505 to help clean up the rhythm channel and add some clarity. I think he may have recently added a JJ 5751 in there somewhere too. You might shoot him a pm and ask exactly what he's running now.

But like Perverockstar said, JJs are your best bet for that amp. I'd put them in all positions. If you find it too dark, you might try a Tung-Sol Reissue 12ax7 in V1.

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R45VT

V1 and the PI he switched to lower gain. Helps then stay clean.

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ikey_

i like me some 12at7 in the last PI spot.

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KailM

I indeed use a JJ 5751 in V1, and a JJ 12 AT7 in the phase inverter position. Both of those are lower gain tubes (the AT7 moreso than the 5751). Those two tubes made a world of difference on my cleans. They also separated the lead distortion from the rhythm w/ crunch distortion a lot more -- the lead channel is still balls-out metal but less fizzy, and the rhythm w/ crunch sound is a lot more mild and classic-rock-like (still plenty of gain though). I use JJ 12AX7s in all other positions.

Aside from that, I think your pickups can maybe be more of a deciding factor on getting that tight Fear Factory sound. I think the tubes I mentioned might help get you closer, but pickups will play a role too. My guitar with Blackouts still provides an all-out death/black metal tone through that configuration. But my guitar with a Dimarzio D-Sonic provides more of a Lamb of God tone; very tight and chunky -- which I think might also be closer to a Fear Factory sound.

Hope that helps!

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