It has to much distortion. Can anybody help to tweak the amp a little bit so that it has more clean headroom? Thx Mike
Komet 19 like build
Moderators: pompeiisneaks, Colossal
Komet 19 like build
last night i finished my komet 19 like build. The Amp is something like a Marshall 20W with cascaded preamp. Damn is this amp loud. Too loud. It has to much distortion. Can anybody help to tweak the amp a little bit so that it has more clean headroom?
Thx Mike
It has to much distortion. Can anybody help to tweak the amp a little bit so that it has more clean headroom? Thx Mike
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Re: Komet 19 like build
Can you post some of your design specifics?
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Re: Komet 19 like build
Ignore that last post. I didn't see your attachments.
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Re: Komet 19 like build
I would start by changing your cathode bypass caps from 25uf to 10uf. Start with v1a and include v1b if that isn't enough.
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Re: Komet 19 like build
Have you confirmed that the info you obtained about this being the Komet circuit is accurate?
I am not familiar with that Phase Inverter circuit but it looks like it could add a lot of dirt.
The first thing I would try is lowering the 470k grid resistors on the EL84s. Tack a 470k parallel with each existing 470k and see what it sounds like.
If it's still over the top tack in 220ks in place of the tacked in 470ks. If one of those combos work replace with equivalent value single resistor.
Regards Randy
I am not familiar with that Phase Inverter circuit but it looks like it could add a lot of dirt.
The first thing I would try is lowering the 470k grid resistors on the EL84s. Tack a 470k parallel with each existing 470k and see what it sounds like.
If it's still over the top tack in 220ks in place of the tacked in 470ks. If one of those combos work replace with equivalent value single resistor.
Regards Randy
Re: Komet 19 like build
I'd try a 12AY7 in v1 & a 12AT7 in the LTPI
With respect, 10thtx
With respect, 10thtx
Re: Komet 19 like build
He mike what going on with your amp.
You cant just leave us hanging.
I am sure there are a ton of guys wanting to build this amp and would like to know if the schematic is accurate and if you resolved your issues.
Regards
Randy
You cant just leave us hanging.
I am sure there are a ton of guys wanting to build this amp and would like to know if the schematic is accurate and if you resolved your issues.
Regards
Randy
Re: Komet 19 like build
Oh sorry guys. 
I did not think you are waiting on me. I had not much time on building my Amp last week. But i tweaked it a little bit and now i think its ready to play. What i did is changing R6 to 220k, R7 to 100R and R14,R15 to 220K. Does somebody know any original Value of parts of this little monster? You sure want to know which tranny i use. PT is a Hammond 370DX and OT is a Marshall 18W from Tubetown.de. Headshell is in process. May be i finish the Amp in the next 2 weeks.
I did not think you are waiting on me. I had not much time on building my Amp last week. But i tweaked it a little bit and now i think its ready to play. What i did is changing R6 to 220k, R7 to 100R and R14,R15 to 220K. Does somebody know any original Value of parts of this little monster? You sure want to know which tranny i use. PT is a Hammond 370DX and OT is a Marshall 18W from Tubetown.de. Headshell is in process. May be i finish the Amp in the next 2 weeks.You do not have the required permissions to view the files attached to this post.
Re: Komet 19 like build
Geez, Mike, just go back to the original schematic and change your volume control to 500K and R9 to 220K.
....And now that I stare at your schematic a bit longer, change R11 to 120K and R13 to 15K-22K
....And now that I stare at your schematic a bit longer, change R11 to 120K and R13 to 15K-22K
Most people stall out when fixing a mistake that they've made. Why?