Schematic for your feedback
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Re: Schematic for your feedback
Well. take another look and see if I have it correct now.
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Re: Schematic for your feedback
Tons of errors....
rutledj wrote:Well. take another look and see if I have it correct now.
Re: Schematic for your feedback
Thanks but that doesn't help much
Re: Schematic for your feedback
That is why I sent a PM simultaneously.... You did not check your inbox! LOL
rutledj wrote:Thanks but that doesn't help much
Re: Schematic for your feedback
OK. Here is the latest complete circuit.
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.022uf after v1-b
hello there,this is my first post...,so here goes...
i was looking at your schematic and noticed that
you opted for a .022uf coupler after v1-b...
i think every schematic i've looked at showed a 047 there,i was wondering what that would do for the sound if the amp....
________
VOLCANO VAPORIZERS
i was looking at your schematic and noticed that
you opted for a .022uf coupler after v1-b...
i think every schematic i've looked at showed a 047 there,i was wondering what that would do for the sound if the amp....
________
VOLCANO VAPORIZERS
Last edited by simsamp on Wed Feb 23, 2011 9:30 pm, edited 1 time in total.
Re: Schematic for your feedback
Rut
only need one 47p at most across the PI plates, not to the cathodes.
PAB still not right. It should lift the bottom of treble pot and lift the wiper of the the bass pot when engaged
Not sure about the presence wiring. looks like a Marshall PI in which case The 4.7k resistor should go to ground and the cap and pot (wired as variable resistor) are in series across the 4.7k resistor.
The 47p on the clean master could shunt some highs when in OD. ODS 101 should show a way to deal with that.
only need one 47p at most across the PI plates, not to the cathodes.
PAB still not right. It should lift the bottom of treble pot and lift the wiper of the the bass pot when engaged
Not sure about the presence wiring. looks like a Marshall PI in which case The 4.7k resistor should go to ground and the cap and pot (wired as variable resistor) are in series across the 4.7k resistor.
The 47p on the clean master could shunt some highs when in OD. ODS 101 should show a way to deal with that.
Re: Schematic for your feedback
Hopefully I'm closer.
simsamp: I'll probably end up playing with those values but I would suspect less bass with the .022
simsamp: I'll probably end up playing with those values but I would suspect less bass with the .022
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Last edited by rutledj on Wed Aug 15, 2007 8:37 pm, edited 1 time in total.
Re: Schematic for your feedback
Looks like dogears made you busy, rut.
The coupling caps from PI to power tubes is right? Other schems show a .1uF instead of the .02uF you have there.
Hope you project comes out alright.
The coupling caps from PI to power tubes is right? Other schems show a .1uF instead of the .02uF you have there.
Hope you project comes out alright.
Re: Schematic for your feedback
The caps are .02 in this style circuit....
Also, the treble pot can be either audio or linear, but I prefer linear. Most if not all Dumbles are linear too....
Also, the treble pot can be either audio or linear, but I prefer linear. Most if not all Dumbles are linear too....
fabiomayo wrote: The coupling caps from PI to power tubes is right? Other schems show a .1uF instead of the .02uF you have there.
Hope you project comes out alright.
Re: Schematic for your feedback
The 15K bias tail resistor will never work - should be more like 51K. Ditto on the above recomendation on the presence network connections - get the 4.7k direct to ground and put the cap and pot in series to make one leg in parallel with the 4.7k. You will also need to adress the crappy non-HRM tone you will get with the HRM input trim values not to mention the volume change when you switch out the HRM tone stack, you may need some R value to ground to compensate. Glasman does this HRM and non-HRM sucessfully somehow in the same amp but his methods are probably proprietary(as they should be).
Former owner of Music Mechanix
www.RedPlateAmps.com
www.RedPlateAmps.com
Re: Schematic for your feedback
On second thought the 15K might work if you use EL34s in the output but then you would need to up the sceen resistors to 1K (I would do that anyway).
Former owner of Music Mechanix
www.RedPlateAmps.com
www.RedPlateAmps.com
Re: Schematic for your feedback
Oops...did not notice the switchable HRM. Can't do it! Scrap it. Won't work without MAJOR MAJOR revisions. Trust me.
Re: Schematic for your feedback
rutledj wrote:...I'll probably end up playing with those values but I would suspect less bass with the .022
Start with known good values. Don't screw around blind, there's a reason for everything in these amps.
Re: Schematic for your feedback
OK. Not sure if I have the Presence correct yet or not. Seems like a lot of these suggestions don't match the posted schematics but I guess they are workable "tweaks"?
I'll go Non-hrm for now and try to figure out the switching later after I have something that works.
Bob-I: The .022 in the Clean 1 ckt came from a schematic that I think you posted a good while back so I'm hoping it is correct. Can you comment on whether this ckt came out ok?
Thanks to all for your feedback.
Rut
I'll go Non-hrm for now and try to figure out the switching later after I have something that works.
Bob-I: The .022 in the Clean 1 ckt came from a schematic that I think you posted a good while back so I'm hoping it is correct. Can you comment on whether this ckt came out ok?
Thanks to all for your feedback.
Rut
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