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5150 plate resistors


 
4/24/2003 7:00 PM
Joe N.
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5150 plate resistors
I Know some of you have tried this. How does the 5150 sound with 100K Plate resistors, instead of the 220K's  
Joe N.
 
4/25/2003 12:33 AM
KB
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Joe you still playing with that 5150 ? Well the 100k's tone it down but it doesn't kill the hiss or ocean sound. It does help though but you have to be careful because if you knock it down to much it starts messing with the phase inverter signal and gets a starved sound and kills your volume. I'll tell you what really helps this amp is to put a hush in the loop or any noise gate and it will work wonders.,  
 
KB
 
 
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4/25/2003 1:28 AM
Joe N.
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Yeah, actually, I just slo'd the 5150, but i'm not sure if I'm satisfied with the sound. It sounds pretty similar to the 5150, but a lot warmer(probably because it is properly biased), and a little less gain, not bad sounding at all. I was actually expecting a different sound though. I was looking for a lot of gain, but refined, with a lot of clairity. The Slo seems to be more raw sounding. I should have known better, they are both practically the same amp. Noise isn't really the issue, it's more tone that I'm concerned about. I've tried the Bogner circuit, whci didn't really do the trick. Maybe VHT, but you can't get the schems.  
Joe N.
 
4/25/2003 1:30 PM
KB
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I agree about the raw sound and that's the first thing I noticed. You may try a better output tranny. I used the Marshall Drake old 100 out of a 2203 but an OEI would do real nice too.,  
 
KB
 
4/26/2003 9:27 PM
Joe N.
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I've been trying to design my own high gain circuit, but It is a lot of work, and experimentation. I read a post that you were involved in Kerry. Something about Cathode followers after the gain stages. I also noticed that the marshall 30th anniversary used three in a row, sometime back. I remember I thought it was odd, but never really thought anymore about it. I didn't think that the low voltage from the cathode would be significant enough to slam the next stage's grid into overdrive, but that amp does have alot of gain.  
Joe N.
 
4/27/2003 6:25 PM
KB
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Well according to Kevin and in TUT2, this technique was a scheme to increase tube count as a sales tactic. That's why I said I didn't really see the need in between stages and maybe there is some majic there as far as soft clipping and it kinda makes sense when the tube is close to cutoff but hey I could do that with clipping diodes and a series resistor to simulate the AC plate resistance and accomplish the almost same thing. The flip side is when driving tone stacks they are good and may be the majic there for Marshall but I simply haven't done enough experimenting with them in between to give a definitive answer because I use tubes for gain unless it's for driving a tone stack like in so many amps on the market. Maybe someone like Ray who I know has done some experimenting with has more details and of course Kevin.,  
 
KB
 
4/28/2003 7:19 PM
Joe N.
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For A Sales Tactic! What a Waste. It just makes that amp more expensive for consumers in both the initial sale, and in retubing cost. I own a H&K Triamp, thank god I haven't had to re-tube it yet. Actually The best sounding amp I own is a red 2203. The only mod I would do to it would be to add an effects loop. Marshall actually re-issued it (as first a Zach Wylde signature), and now recently as just a plain old JCM800 2203. it goes for two plus grand. You can get an original for 500$ I think they did add an effects loop to the circuit though. They also have a new 1959slp with a loop.  
Joe N.
 
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