Would You mind to check my (fuzzy) drawing on the top of Your bassman layout ? I'm going to try the HRM because its just few parts change. I'll build the post-tone section on seperate board as You have suggested.
The changes:
swap:
-drive 250kA and level 1MA pots
-OD input network (trimmer=25k,200k on left lug with series with 470k in parallel with 47p, 4k7 to ground from right lug)
-(mid cap = .01uf) I have now switch to choose from 3 values
-cathode bypass V1a=5uf/3k3 V1b=5uf/2k2 V2a=5uf/2k7 V2b=1uf/1k8
replace:
-from V2b plate OD2 coupling cap (.0047) with post-OD tone stack
It looks mostly correct. The only thing that jumps out at me is the channel switch. With the HRM it will use 2 masters rather than a single master and a level control. You need to change it around so the the common on the switch goes to the PI input.
Normster wrote:It looks mostly correct. The only thing that jumps out at me is the channel switch. With the HRM it will use 2 masters rather than a single master and a level control. You need to change it around so the the common on the switch goes to the PI input.
Thanks Normster. Do You think it is right on the next picture?
Looks like your PI plates are backwards? The 100k and 120k
I'd lower the OD2 grid. Try 150k to 160k
The 27pf on the clean master is gonna mess with the OD tone. If you keep a bright cap, I'd lower it to something no larger than 15pf
No V1b feedback....
Thanks Normster and dogears.
Now I have made up my mind, I'll start the cleaning operation of the amps wiring and leave it there (I'll check the 27p on the master + the PI plates). I'll start a new HRM project from scratch.
Thanks for all the help for my first D-clone
cheers,
Looks like your PI plates are backwards? The 100k and 120k
I'd lower the OD2 grid. Try 150k to 160k
The 27pf on the clean master is gonna mess with the OD tone. If you keep a bright cap, I'd lower it to something no larger than 15pf
No V1b feedback....
Thanks Normster and dogears.
Now I have made up my mind, I'll start the cleaning operation of the amps wiring and leave it there (I'll check the 27p on the master + the PI plates). I'll start a new HRM project from scratch.
Thanks for all the help for my first D-clone
cheers,
There is an alternate switch arrangement that will avoid the situation Dogears mentioned about the 27pf bleeder. I use it and it works (although my amp is not quite in the groove soundwise yet) - nothing to do with the switch tho. I got the switch schematic from someone here. check out this thread of mine where I think I also posted my schematic containing the relay i am referring to.
846]http://www.pichotel.com/pic/16028B31e/118464.jpg[/img]
