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Post by StrangeC on Sept 12, 2006 19:18:10 GMT -7
Mine breaks up real early (like by 9:00) and I remeber somthing about a conjunctive filter or in the Ghia thread that could cause this. Should this have a bit more clean or is this right. It doesn't really sound bad- just seems to be more gainy than my Ghia which doesn't seem quite right.... but...
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Post by jwr on Sept 12, 2006 20:10:26 GMT -7
Somewhere with all 3 knobs around noon. I think the best sound I get out of mine is with all the controls around 3:00. I have heard about the conjuctive filter as well, but I'm not sure if that's the problem. I'd contact the Doc, it's worth an E-mail or phone call. Jason
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Post by rcrecelius on Sept 13, 2006 6:36:00 GMT -7
FWIW - I think the conjuctive filter is only on the Ghia and maybe the Mazerati...the 1 tone knob amps. Mine used to break up around 12-1, depending on where the tone controls were set but I recently stuck some power tubes in wrong and messed the amp up...sent it to the DR and it came back with all new tubes plus he replaced the screen grid resistors that fried and this thing now has tons of clean headroom! Its like a different amp. I emailed and ask if he did anything else to the amp...he said setting the bias correctly would make a big difference plus he put a good 5751 back in the Phase Inverter.
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Post by taswegian on Sept 13, 2006 6:43:51 GMT -7
Hey Ronnie, that's a killer outdoor stereo rig you'll have now!
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Post by rcrecelius on Sept 13, 2006 7:51:26 GMT -7
Hey Ronnie, that's a killer outdoor stereo rig you'll have now! Funny you should mention that...just the other day I bought a Startouch ABY pedal with that in mind
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Post by kledbet on Sept 13, 2006 9:47:45 GMT -7
Another option on the breakup is to get tubes rated higher. If the tubes in your amp are rated at 4 or 5 you will get earlier breakup. Try tubes rated at maybe #7 to gain headroom in your amp.
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Post by billyguitar on Sept 13, 2006 10:27:15 GMT -7
Lower gain preamp tubes too. 5751, 12AY7
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Post by kledbet on Sept 13, 2006 10:39:09 GMT -7
The Z28 uses the EF86 V1 input tube and comes with a 5751 as the PI tube already. Check to see if the tube in V2 is really a 5751, if it is a 12ax7 you will really get early breakup.
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Post by UnclePat on Sept 14, 2006 5:36:34 GMT -7
More often than not, this is where I end up too. Pretty much a perfect sound at that point.
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Post by rcrecelius on Sept 14, 2006 6:02:03 GMT -7
More often than not, this is where I end up too. Pretty much a perfect sound at that point. Ditto...except that I prefer the bass a little lower.
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Post by kledbet on Sept 15, 2006 0:52:49 GMT -7
With these tone controls if you go past 12 o'clock on the bass and treble, then the amp acts like the Route 66 and starts getting louder and more aggressive in the region you select. To keep it kind of clean, set your controls of bass and treble at around 12. Even though I seem to like the tone controls at 3 or dimed, you will get more headroom by backing them down.
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Post by nickreynolds on Oct 1, 2006 21:50:32 GMT -7
what are some good settings to try with a Z28 and OCD for some good classic rock tones?
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Post by taswegian on Oct 1, 2006 22:36:19 GMT -7
Save the OCD for modern rock tones or low volume od tones. For classic rock tones just wind those tone controls past 1 oclock and the volume anywhere past 12. The Z28 does some great classic rock tones when its pumpin'. With my humbuckers I really liked it at Volume 3:00 Bass and Treble 12:00 but everyone with singles seems to like the 3:00 all knobs setting. Work those tone controls!
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Post by myles on Oct 2, 2006 11:00:44 GMT -7
For me this really varies as I go between a 12AX7 and 5751 for the phase inverter. It also depends on where the tone controls are set.
It is easy to have all controls at noon and have great headroom with a Strat or Tele with a 5751 phase inverter and a set of #6 6V6 output tubes biased at 26mA (70% at 380 B+) If you have 370 B+ or so this would not change much at all as a side note.
380 V 14 W
40% 50% 60% 70% 15 18 22 26
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Post by StrangeC on Oct 31, 2006 18:02:57 GMT -7
I just replaced the Groove Tube 6V6R #5s that were in my used Z28 with some EH 6V6 #27 from Tube Depot and may have figured out why my Z28 was a bit gainier than I liked. The bias was at 28-30mA. I re-biased the new EHs to 24-26 as per Myles' suggestion. The amp has more headroom, but more importantly more clarity, tightness, and a smoother, less 'fuzzy' overdrive. Some of this might just be fresh tubes, but some may be due to the bias setting. IDK, but I'm happier now with the sound.
Is the #27 'bias point' on the Tube Depot rating as suggestion for 27mA? What exactly does Tube Depot's number refer to?
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