Needs a bit of tweaking to get the bass under control.
Change the second stage to 10k .1u and the 220k on the gain pot to 150k or even 100k.
Moderator: VelvetGeorge
Will do! It will be more #34 like though?
Here you go. Mk7 with a 10k/.1 stage and .1 presence.CoffeeTones wrote: ↑Thu Jun 17, 2021 11:32 amIf you take that MK7 topology and plop another modest gain stage in somewhere, you might find the golden egg. Many times modders follow a trend like that and I'd bet that many 80's rock records have MK7 lineage amp tones on them. I might not put a snubber on stage 1 plate since that stage is not peaked much. I'd try snubbing one of the later stages unless the stage 1 snubber is made necessary by some behavior. I doubt .68uF presence will work with the MK7 since the first stage is passing most frequencies. I may do that mod myself in a few days. There is a JCM 800 circuit just sitting here
Me likey! Good job!gluke wrote: ↑Sat Jun 26, 2021 6:01 am150k and 10k/.1 sounds like this:
WTTJ:
https://youtu.be/iWcioYVXeaM
10k // .1 placed where? NFB value?gluke wrote: ↑Sat Jun 26, 2021 6:04 amHere you go. Mk7 with a 10k/.1 stage and .1 presence.CoffeeTones wrote: ↑Thu Jun 17, 2021 11:32 amIf you take that MK7 topology and plop another modest gain stage in somewhere, you might find the golden egg. Many times modders follow a trend like that and I'd bet that many 80's rock records have MK7 lineage amp tones on them. I might not put a snubber on stage 1 plate since that stage is not peaked much. I'd try snubbing one of the later stages unless the stage 1 snubber is made necessary by some behavior. I doubt .68uF presence will work with the MK7 since the first stage is passing most frequencies. I may do that mod myself in a few days. There is a JCM 800 circuit just sitting here
WTTJ:
https://youtu.be/UvRL0YDmH8M
Nightrain:
https://youtu.be/Xj8FQe791k4
10k // .1 between which two stages? NFB value?gluke wrote: ↑Sat Jun 26, 2021 6:06 amMk7 with the 10k/.1 stage between the two stages.
WTTJ:
https://youtu.be/U5vx22X_5q4
Nightrain:
https://youtu.be/3OUCdE-oajo
First one is first two stages if mk7 then 10k/.1 stage
That one is 10k/.1 on the second stage.
Thanx! I think I need to get a LP of some sort. SCOM just doesn’t work on a P90....
This sounds pretty darn good!gluke wrote: ↑Sat Jun 26, 2021 6:01 am150k and 10k/.1 sounds like this:
WTTJ:
https://youtu.be/iWcioYVXeaM
I’ll do some more clips. We are back at the office now so I don’t have the whole house to myself all day long anymore....... coffee breaks at the home office was brilliant for small tweaks and recording clips.