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91
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Ceriatone / Overtone / Re: Customized OTS 50W (Bluesmaster Clean) First impression
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on: December 30, 2010, 11:01:21 AM
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Hi erwin_ve,
I have a early 2008 50 watt ods which I have upgraded to a 100 watt with Mercury magnetics transformers, but I have never been happy with the od sound and the clean sound is not as clear as I would like. I would appreciate it if you could show me some of the mods you did to get that sound. I also use a heritage 2 x 12 cab with g12-65 speakers.
regards
riverman
E-mail with schematic sent. |
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93
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Ceriatone / Overtone / Re: Bluesmaster settings - keep the Bass control dialed in low
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on: December 23, 2010, 08:06:29 AM
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Claus I'm happy for you finding your sound. I agree the on bass content of the Bluesmaster
One thing I disagree. The BM Phase Inverter has less headroom compared to the Standard Phase inverter.
You can calculate this; 9k(BM) vs. 25k(standard) cathode resistor for the PI. 9k has less headroom but also more harmonics due to valve characteristics(non-linear distortion).
Bass content can also be managed with the slope resistor; 47k is standard in a BM. But many, including me, go for a 68k or even a 100k slope resistor.
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95
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Ceriatone / Overtone / Re: SAG resistor in a HRM 50W
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on: December 10, 2010, 05:10:27 PM
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@erwin_ve: Thanks for the advice. Yeah you didn't mention Robben Ford:-) But I read another thread were they switched the choke for a resistor and called it the Robben Ford mod so it was just an assumption from my side, no hard feelings:-)
I just play at home at the moment so a sagresistor would be a blessing, but maybe on a switch so I could take it out of the circuit when playing on larger stages.
Could I use the groundswitch that is not used in the HRM to mount the resistor?
cheers
Thomas
Yes you can use the groundswitch. However you have to take care with the wiring. If you're crossing other wires(like filaments) you have a serious problem. |
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96
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Ceriatone / Overtone / Re: SAG resistor in a HRM 50W
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on: December 08, 2010, 09:28:03 AM
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Thomas - it's the one between the 3.15v wires, marked 0.
That's the filament wire; if you put a resistor there, it probably will burn. The one Gregg is talking about is probably the one between the 345 wires. I would be reluctant to use it, because you raise the ground potential. With a shared CT grounding for the filaments you'll risk hum. But then again I'm not a EI. @Hoffe; you wanted sag. I didn't mention Robben Ford. I'm trying to help you, not turn your amp in #102. Btw I don't like a sag resistor in this amp unless you play at small room levels. |
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97
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Ceriatone / Overtone / Re: SAG resistor in a HRM 50W
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on: December 07, 2010, 10:22:04 PM
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erwin_ve: a sag resistor is NOT a resistor in place of a choke. a resistor CAN be used in place of a choke transformer, and is used in certain designs, like on my Sovtek, for example. In either case the choke transformer or choke resistor, depending on what is being used works kinda like a built in line filter to help clean up the power signal a bit.
The sag resistor the OP is referring to is most likely what Nik is building into my HRM BM 50 watter which will be a resistor placed on the center HT lead coming out of the power transformer, which will help simulate having a tube rectifier. on mine this will be able be switched in and out.
Gregg
We're basically thinking the same. Both ways you have sag. Both are connected to the Ht lead. Yes you're right it's not the only way. For the sake of the non-technical TS, he will benefit with a approach were there is a simple swap, instead of adding or drilling something in the existing layout. Btw the difference between a choke or a choke resistor is noticable at band volumes as sag in favor of the choke resistor. Not only line filtering. |
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99
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Ceriatone / Overtone / Re: C-Lator/Kleinulator
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on: December 03, 2010, 08:20:21 AM
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What's the scoop on long cable runs from effects loop (K-lator) all the way to pedal board to have stomp ability on delay, reverb, etc? I always here peoeple say a great loss of tone - anybody share your experiences please?
The fx-loop of the amp is passive and has a high impedance; High impedance doesn't work very well with long cables. You lose a lot of high frequency. The fx-loop of the klein/clator is low impendance and can handle large cables a lot better. But don't go too long, you always will lose a bit of high frequency. |
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100
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Ceriatone / Overtone / Re: The Robben Ford-quest; how close can I get on a "standard" OTS?
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on: November 17, 2010, 04:00:45 PM
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Not my amp (Erwins). It's maybe a matter of taste. I felt it sounded a bit more agressive. On the other hand. there are so many things that have an impact. If you stick different tubes in, the amp will sound different.
Steven, Reading your wishes, sounds like you want more compression and a brighter clean channel. Maybe a resistor instead of a choke(more compression, I dislike it, but maybe you like it) will do the trick together with a EVM12L speaker. |
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101
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Ceriatone / Overtone / Re: The Robben Ford-quest; how close can I get on a "standard" OTS?
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on: November 17, 2010, 11:21:19 AM
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Hi Steven Cleans aint that bad as well. Good harmonics in the cleans of this one. I am quite surprised abt comments on how it's supposed to be quite bright without the clator. I dont find it is. The S&M would be brighter, for example. The Clator would be good, we even make custom head cabs now so that the Clator fits in right inside. No more complaints abt hard to carry the clator around?  Thanks! Nik Nik, The 68pF on the master is passing through lots of highs. That's making the amp very bright. If the master cap is omitted, the amp is less bright. Using a Clator rolls off the highs off the bright cap. I have my amp with these specs for more than a year now and without a dumblelator/clator the od sound is unuseable |
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102
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Ceriatone / Overtone / Re: The Robben Ford-quest; how close can I get on a "standard" OTS?
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on: November 07, 2010, 12:01:55 PM
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The Mustang is a clone of a clone. I believe that the source was a Bludodrive Ojai and it's 'secrets' were not revealed by the proprietor of Bludo rather another US amp builder who came across it. I don't know if Nik has followed the information 100% - the Ojai circuit is quite specific about the use of components / tolerance especially the Pots for Input gain and Midrange. These are Audio taper pots but the taper response is 30% on Robben / Ojai amps rather than the more common 15% on standard tape pots. In practice this means that for any given setting (say Noon), the 30% taper pot is electrically further along it's travel. In simple terms, Noon on a 30% taper pot gives more midrange than a 15% pot set at Noon (similar impact for gain on the input gain control). There is no more gain / midrange available overall, it only impacts on where you end up setting the pot to achieve the sound that you desire.
The Ojai was made public by someone else, the maker of Bludotone jumped in the discussion and altered some specs regarding the amp of RF. |
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