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Post by bloozeman on Oct 13, 2015 19:21:27 GMT -7
Just wondering if the Jaz can take 6L6 tubes like a few other Z amps can although they are marked for 6v6?
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Post by doctorice on Oct 14, 2015 4:36:42 GMT -7
I'm not absolutely sure, but I think not.
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Post by zpilot on Oct 16, 2015 0:08:21 GMT -7
I haven't tried it but it shouldn't damage anything. The pinout of the two types is the same. It comes with JJ 6V6's which are close to being 6L6's. To be optimized you would need to change the bias and you would certainly need to change it back before reinstalling the 6V6's.
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Post by doctorice on Oct 16, 2015 3:57:04 GMT -7
Just wondering if the Jaz can take 6L6 tubes like a few other Z amps can although they are marked for 6v6? Jeff, Best to contact Z directly. The shop (repairs@drzamps.com) is quite good at responding to email inquiries pretty quickly. Mike
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Post by digiTED aka 'Ted' on Oct 16, 2015 7:03:34 GMT -7
Just wondering if the Jaz can take 6L6 tubes like a few other Z amps can although they are marked for 6v6? Jeff, Best to contact Z directly. The shop (repairs@drzamps.com) is quite good at responding to email inquiries pretty quickly. Mike Agreed ^^^ Some additional thoughts: The JAZ is cathode-bias, i.e. 'self-adjusting' or variable bias'. It's also tuned for the current draw of a robust 6V6 so I would think that a quartet of 6L6 would would draw more current than the sweet spot designed by Dr. Z, thus wind up cold. I've tried 6L6 in a few Dr. Z amps designed around other tubes (Z-28, Route 66, Antidote) and while I could adjust these amps' 'fixed bias' (i.e set to a 'fixed' point manually) to a safe operating zone, I never liked things as much as with the tube Dr. Z designed for.
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Post by zpilot on Oct 16, 2015 21:40:54 GMT -7
Jeff, Best to contact Z directly. The shop (repairs@drzamps.com) is quite good at responding to email inquiries pretty quickly. Mike Agreed ^^^ Some additional thoughts: The JAZ is cathode-bias, i.e. 'self-adjusting' or variable bias'. It's also tuned for the current draw of a robust 6V6 so I would think that a quartet of 6L6 would would draw more current than the sweet spot designed by Dr. Z, thus wind up cold. I've tried 6L6 in a few Dr. Z amps designed around other tubes (Z-28, Route 66, Antidote) and while I could adjust these amps' 'fixed bias' (i.e set to a 'fixed' point manually) to a safe operating zone, I never liked things as much as with the tube Dr. Z designed for. Yes it would probably be a little cold the way it is biased but it may be close enough for you. Only your ears will know. Because of the way my JAZ is finicky about what 6V6's it can use I have considered converting it to use 6L6's but as Ted has said I think overall "Z" amps are better left stock. Changing bias will require changing resistors, not just an adjustment of a pot and should be left to a good tech. Of course any of this will void the warranty.
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Post by randalp3000 on Oct 17, 2015 8:55:52 GMT -7
Do 6l6's draw more heater current? I'll check later fot ya
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Post by randalp3000 on Oct 17, 2015 9:15:48 GMT -7
Yep, I was correct, almost twice as much 6v6 .5A X4=2A 6l6 .9A x4=3.6A that's a lot of current and I'm not sure if the PT is overbuilt enough for that.
as for the bias fender 5b6 bassman with 6l6's uses a 250ohm cathode resistor as does the fender 5e3 deluxe with 6v6's so the bias should be in the ball park but maybe on the cold side the Remedy uses split cathodes with 2 150ohm cathode resistors(a bit hot) the Jazz may be similar
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Post by bloozeman on Oct 17, 2015 15:46:04 GMT -7
what happens if an amp is biased too cold or too hot? does it do damage to the amp? effect the tone? makes the tone warmer or stiffer?
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Post by zpilot on Oct 18, 2015 19:21:07 GMT -7
Too cold won't hurt the amp. Too hot will cause the plates to overheat and eventually will damage the circuit. You will know it when the plates start glowing red.
Most of the guys I know who used to play Twin Reverbs liked them biased a little cold. Tubes lasted longer.
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Post by nicholas on Oct 20, 2015 13:04:33 GMT -7
Yep, I was correct, almost twice as much 6v6 .5A X4=2A 6l6 .9A x4=3.6A that's a lot of current and I'm not sure if the PT is overbuilt enough for that. Yup. Ive had a few cathode biased amps that could use either a quad of 6v or a pair of 6L to keep from destroying the PT. But they had a bias switch. I'm not sure if that's an option though as I thought I read the 1/2 power is different than just cutting out two tubes. I think it needs all 4 tubes at all times, but not sure on that. I guess I'd ask what are you looking for different? I'd wadger a speaker swap would yield bigger sonic differences than messing with the tubes. Put an EVM12L in that sucker!
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