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"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
This is the reverb circuit (and PI) from the Carvin btw:
If so you could then reduce the gain for the reverb recovery by changing R29 to 100K, which should make it less prone to picking up noise.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
...and set at 5 from 1:00 in this one:
In the meantime, having spent some time working on the layout, I have had a revelation - I could turn the donor chassis round front/back. This would have several advantages:
- I can use the Modulus Wrocket 30 layout almost as-is.
- I can build it on the appropriate Modulus turret board, which will go easily into the larger space now available.
- The line of valves will move 6cm towards towards the back of the speaker cabinet, providing extra clearance that will allow me to fit a speaker with a bigger magnet if I want.
There are some disadvantages, but not insurmountable:And the combo cabinet. There's no upper 'back door' panel but I have ordered a perforated aluminium 3U sheet that I can cut, bend, and spray paint.
Is there actually any reverb on that? lol .
I can just about hear that. That would be the amount you get on a Fender with it set at 0.5 .
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I'll be building the reverb on a separate small board, so if I don't like it, it will be easy enough to take out. Just looking at the Fender Twin circuit, I could put the 12AT7 driver in V4, and use the spare half of V1 for recovery. However my B+ will be 360V maximum, whereas the 12AT7 in the Twin is shown with 440V on its plates - not sure whether that would be a problem!
I get what you mean about Fender reverbs - I rarely run them above about 4, anything higher is into Dick Dale territory. I just like to have 4 or 5 as the maximum, not 1 .
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Going to use the existing front panel rocker switch for mains, but still undecided about a standby switch. Also why the hell is there no red pencil in my house?
While it’s true that one is not “necessary”, it’s still very useful to have a simple means of turning off the HT supply separately from the whole amp, especially for troubleshooting. It’s also better for the filter caps at the far end of the chain - which sometimes have lower voltage ratings - not to be hit with the full HT before the valves have warmed up.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I might also spray paint this a sympathetic colour at some point.
Cant wait to see the build progress. Great to see the attention to the metalwork which will make it a fine looking finished amp - something I have a tendency to rush tbh.